README.md

@@ -54,7 +54,7 @@ Contributions are welcome and greatly appreciated. Please read the [guidelines](
 
 junifer is released under the AGPL v3 license:
 
-julearn, FZJuelich AML neuroimaging feature extraction library.
+junifer, FZJuelich AML neuroimaging feature extraction library.
 Copyright (C) 2022, authors of junifer.
 
 This program is free software: you can redistribute it and/or modify

docs/extending/marker.rst

@@ -15,12 +15,11 @@ Thus, only a few methods are required:
 1. ``get_valid_inputs``: a method to obtain the list of valid inputs for the marker. This is used to check that the
    inputs provided by the user are valid. This method should return a list of strings, representing 
    :ref:`data types <data_types>`
-2. ``get_output_kind``: a method to obtain the kind of output of the marker. This is used to check that the output
+2. ``get_output_type``: a method to obtain the kind of output of the marker. This is used to check that the output
    of the marker is compatible with the storage. This method should return a string, representing 
    :ref:`storage types <storage_types>`
 3. ``compute``: the method that given the data, computes the marker.
-4. ``store``: the method that stores the computed marker.
+4. ``__init__``: the initialization method, where the marker is configured.
-5. ``__init__``: the initialization method, where the marker is configured.
 
 As an example, we will develop a Parcel Mean marker, that is, a marker that first applies a parcellation and
 then computes the mean of the data in each parcel. This is a very simple example, but it will show you how to create
@@ -44,7 +43,7 @@ it will be ``table``. Thus, we can define the output as:
 
 .. code-block:: python
 
-    def get_output_kind(self, input_kind):
+    def get_output_type(self, input_kind):
         if input_kind == 'BOLD':
             return 'timeseries'
         else:
@@ -143,38 +142,24 @@ This dictionary will later be passed onto the ``store`` method.
         return out
 
 
-.. _extending_markers_store:
+.. _extending_markers_finalize:
 
-Step 4: Store the marker
+Step 4: Finalize the marker
-------------------------
+---------------------------
 
-In this step, we will define the method that stores the marker. This method will be called by junifer when needed,
+Once all of the above steps are done, we just need to give our marker a name, state its *dependencies* and register it
-using the data provided by the ``compute`` method. The method ``store`` has three arguments:
+using the ``@register_marker`` decorator.
 
-* ``kind``: A string indicating the :ref:`data type <data_types>` that was used to compute the marker.
+The *dependencies* are the core packages that are required to compute the marker. This will be later used to keep track
-* ``out``: The output of the ``compute`` method.
+of the versions of the packages used to compute the marker. To inform junifer about the dependencies of a marker,
-* ``storage``: The storage object, that will be used to store the marker.
+we need to define a ``_DEPENDENCIES`` attribute in the class. This attribute must be a set, with the names of the
+packages as strings. For example, the ``ParcelMean`` marker has the following dependencies:
 
 .. code-block:: python
 
-    def store(self, kind, out, storage):
+    _DEPENDENCIES = {"nilearn"}
-        if kind in ["VBM_GM", "VBM_WM"]:
-            storage.store(kind="table", **out)
-        elif kind in ["BOLD"]:
-            storage.store(kind="timeseries", **out)
 
-.. hint:: Check the hint on :ref:`extending_markers_compute`. If the output of the ``compute`` method is a dictionary
+Finally, we need to register the marker using the ``@register_marker`` decorator. This decorator takes the name of the
-          with keys based on the :ref:`storage types <storage_types>`, the ``store`` method can simply call the right
-          storage function, based on the ``kind`` parameter, with ``**out``.
-
-
-.. _extending_markers_finalize:
-
-Step 5: Finalize the marker
----------------------------
-
-Once all of the above steps are done, we just need to give our marker a name an register it using the
-``@register_marker`` decorator:
 
 .. code-block:: python
 
@@ -186,6 +171,8 @@ Once all of the above steps are done, we just need to give our marker a name an
     @register_marker
     class ParcelMean(BaseMarker):
 
+         _DEPENDENCIES = {"nilearn", "numpy"}
+
         def __init__(self, parcellation_name, on=None, name=None):
             self.parcellation_name = parcellation_name
             super().__init__(on=on, name=name)
@@ -193,7 +180,7 @@ Once all of the above steps are done, we just need to give our marker a name an
         def get_valid_inputs(self):
             return ['BOLD', 'VBM_WM', 'VBM_GM']
 
-        def get_output_kind(self, input_kind):
+        def get_output_type(self, input_kind):
             if input_kind == 'BOLD':
                 return 'timeseries'
             else:
@@ -231,12 +218,6 @@ Once all of the above steps are done, we just need to give our marker a name an
                 out["row_names"] = "scan"
             return out
 
-        def store(self, kind, out, storage):
-            if kind in ["VBM_GM", "VBM_WM"]:
-                storage.store(kind="table", **out)
-            elif kind in ["BOLD"]:
-                storage.store(kind="timeseries", **out)
-
 
 .. _extending_markers_template:
 
@@ -260,7 +241,7 @@ Template for a custom Marker
             valid = []
             return valid
 
-        def get_output_kind(self, input_kind):
+        def get_output_type(self, input_kind):
             # TODO: Return the valid output kind for each input kind
             pass
 
@@ -270,7 +251,3 @@ Template for a custom Marker
             # Create the output dictionary
             out = {"data": None, "columns": None}
             return out
-
-        def store(self, kind, out, storage):
-            # TODO: store out using the storage object, based on the kind of data
-            pass

docs/understanding/marker.rst

@@ -20,4 +20,4 @@ as the actual data is in the memory and the Python runtime has not garbage-colle
 
 If you are interested in using already provided markers, please go to :doc:`../builtin`. And, if you want to implement
 your own marker, you need to provide concrete implementation of :class:`junifer.markers.BaseMarker`. Specifically, you
-need to override ``get_output_kind``, ``store`` and ``compute`` methods.
+need to override ``get_output_type``, ``store`` and ``compute`` methods.

examples/run_compute_parcel_mean.py

@@ -42,7 +42,10 @@ marker = ParcelAggregation(parcellation="Schaefer100x7", method="mean")
 
 ###############################################################################
 # Prepare the input
-input = {"BOLD": {"data": fmri_img}, "VBM_GM": {"data": vbm_img}}
+input = {
+    "BOLD": {"data": fmri_img, "meta": {"element": "subject1"}},
+    "VBM_GM": {"data": vbm_img, "meta": {"element": "subject1"}},
+}
 
 ###############################################################################
 # Fit transform the data

examples/run_ets_rss_marker.py

@@ -66,6 +66,9 @@ with tempfile.TemporaryDirectory() as tmpdir:
     collect(storage=storage)
     # Create storage object to read in extracted features
     db = SQLiteFeatureStorage(uri=storage["uri"])
+
+    # List all the features
+    print(db.list_features())
     # Read extracted features
     df_vbm = db.read_df(feature_name="BOLD_Schaefer100x17_RSSETS")
 

junifer/api/cli.py

@@ -16,8 +16,8 @@ import yaml
 from ..utils.logging import (
     configure_logging,
     logger,
-    warn_with_log,
     raise_error,
+    warn_with_log,
 )
 from .functions import collect as api_collect
 from .functions import queue as api_queue
@@ -69,7 +69,8 @@ def _parse_elements(element: str, config: Dict) -> Union[List, None]:
             raise_error(
                 "The 'elements' key is set in the configuration, but its value"
                 " is 'None'. It is likely that there is an empty 'elements' "
-                "section in the yaml configuration file.")
+                "section in the yaml configuration file."
+            )
     return elements
 
 

junifer/api/functions.py

@@ -7,11 +7,11 @@
 
 import shutil
 import subprocess
+import textwrap
 import typing
 from pathlib import Path
 from typing import Dict, List, Optional, Tuple, Union
 
-import textwrap
 import yaml
 
 from ..datagrabber.base import BaseDataGrabber

junifer/api/parser.py

@@ -5,11 +5,11 @@
 # License: AGPL
 
 import importlib
-from pathlib import Path
-from typing import Dict, Union
 import importlib.util
 import os
 import sys
+from pathlib import Path
+from typing import Dict, Union
 
 import yaml
 
@@ -45,7 +45,8 @@ def parse_yaml(filepath: Union[str, Path]) -> Dict:
         if contents["elements"] is None:
             raise_error(
                 "The elements key was defined but its content is empty. "
-                "Please define the elements to operate on or remove the key.")
+                "Please define the elements to operate on or remove the key."
+            )
     # load modules
     if "with" in contents:
         to_load = contents["with"]
@@ -58,9 +59,11 @@ def parse_yaml(filepath: Union[str, Path]) -> Dict:
                 file_path = Path(os.getcwd()) / t_module
                 if not file_path.exists():
                     raise_error(
-                        f"File in 'with' section does not exist: {file_path}")
+                        f"File in 'with' section does not exist: {file_path}"
+                    )
                 spec = importlib.util.spec_from_file_location(
-                    t_module, file_path)
+                    t_module, file_path
+                )
                 module = importlib.util.module_from_spec(spec)  # type: ignore
                 sys.modules[t_module] = module
                 spec.loader.exec_module(module)  # type: ignore

junifer/api/tests/test_cli.py

@@ -13,6 +13,7 @@ from click.testing import CliRunner
 
 from junifer.api.cli import collect, run, selftest, wtf
 
+
 # Create click test runner
 runner = CliRunner()
 

junifer/configs/juseless/datagrabbers/tests/test_aomic_id1000_vbm.py

@@ -11,6 +11,7 @@ import pytest
 from junifer.configs.juseless.datagrabbers import JuselessDataladAOMICID1000VBM
 from junifer.utils.logging import configure_logging
 
+
 # Check if the test is running on juseless
 if socket.gethostname() != "juseless":
     pytest.skip("These tests are only for juseless", allow_module_level=True)

junifer/configs/juseless/datagrabbers/tests/test_camcan_vbm.py

@@ -12,6 +12,7 @@ import pytest
 from junifer.configs.juseless.datagrabbers import JuselessDataladCamCANVBM
 from junifer.utils.logging import configure_logging
 
+
 # Check if the test is running on juseless
 if socket.gethostname() != "juseless":
     pytest.skip("These tests are only for juseless", allow_module_level=True)

junifer/configs/juseless/datagrabbers/tests/test_ixi_vbm.py

@@ -12,6 +12,7 @@ import pytest
 from junifer.configs.juseless.datagrabbers import JuselessDataladIXIVBM
 from junifer.utils.logging import configure_logging
 
+
 # Check if the test is running on juseless
 if socket.gethostname() != "juseless":
     pytest.skip("These tests are only for juseless", allow_module_level=True)

junifer/configs/juseless/datagrabbers/tests/test_ucla.py

@@ -13,6 +13,7 @@ import pytest
 from junifer.configs.juseless.datagrabbers import JuselessUCLA
 from junifer.utils.logging import configure_logging
 
+
 # Check if the test is running on juseless
 if socket.gethostname() != "juseless":
     pytest.skip("These tests are only for juseless", allow_module_level=True)

junifer/configs/juseless/datagrabbers/tests/test_ukb_vbm.py

@@ -12,6 +12,7 @@ import pytest
 from junifer.configs.juseless.datagrabbers import JuselessDataladUKBVBM
 from junifer.utils.logging import configure_logging
 
+
 # Check if the test is running on juseless
 if socket.gethostname() != "juseless":
     pytest.skip("These tests are only for juseless", allow_module_level=True)

junifer/configs/tests/test_juseless.py

@@ -12,6 +12,7 @@ import pytest
 from junifer.datagrabber.hcp import DataladHCP1200
 from junifer.utils.logging import configure_logging
 
+
 # Check if the test is running on juseless
 if socket.gethostname() != "juseless":
     pytest.skip("These tests are only for juseless", allow_module_level=True)

junifer/data/__init__.py

@@ -21,4 +21,4 @@ from .masks import (
     register_mask,
 )
 
-from . import utils
+from . import utils

junifer/data/coordinates.py

@@ -13,6 +13,7 @@ from numpy.typing import ArrayLike
 
 from ..utils.logging import logger, raise_error
 
+
 # Path to the VOIs
 _vois_path = Path(__file__).parent / "VOIs"
 

junifer/data/masks.py

@@ -8,8 +8,8 @@ from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple, Union
 
 import nibabel as nib
 
-from .utils import closest_resolution
 from ..utils.logging import logger, raise_error
+from .utils import closest_resolution
 
 
 if TYPE_CHECKING:
@@ -58,10 +58,9 @@ def register_mask(
     if name in _available_masks:
         if overwrite is True:
             logger.info(f"Overwriting {name} mask")
-            if (_available_masks[name]["family"] != "CustomUserMask"):
+            if _available_masks[name]["family"] != "CustomUserMask":
                 raise_error(
-                    f"Cannot overwrite {name} mask. "
+                    f"Cannot overwrite {name} mask. " "It is a built-in mask."
-                    "It is a built-in mask."
                 )
         else:
             raise_error(
@@ -117,8 +116,7 @@ def load_mask(
     """
     if name not in _available_masks:
         raise_error(
-            f"Mask {name} not found. "
+            f"Mask {name} not found. " f"Valid options are: {list_masks()}"
-            f"Valid options are: {list_masks()}"
         )
 
     mask_definition = _available_masks[name].copy()
@@ -126,12 +124,10 @@ def load_mask(
 
     if t_family == "CustomUserMask":
         mask_fname = Path(mask_definition["path"])
-    elif t_family == 'Vickery-Patil':
+    elif t_family == "Vickery-Patil":
         mask_fname = _load_vickery_patil_mask(name, resolution)
     else:
-        raise_error(
+        raise_error(f"I don't know about the {t_family} mask family.")
-            f"I don't know about the {t_family} mask family."
-        )
 
     logger.info(f"Loading mask {mask_fname.absolute()}")
 
@@ -167,8 +163,9 @@ def _load_vickery_patil_mask(
         available_resolutions = [1.5, 3.0]
         to_load = closest_resolution(resolution, available_resolutions)
         if to_load == 3.0:
-            mask_fname = \
+            mask_fname = (
                 "CAT12_IXI555_MNI152_TMP_GS_GMprob0.2_clean_3mm.nii.gz"
+            )
         elif to_load == 1.5:
             mask_fname = "CAT12_IXI555_MNI152_TMP_GS_GMprob0.2_clean.nii.gz"
         else:
@@ -178,9 +175,7 @@ def _load_vickery_patil_mask(
     elif name == "GM_prob0.2_cortex":
         mask_fname = "GMprob0.2_cortex_3mm_NA_rm.nii.gz"
     else:
-        raise_error(
+        raise_error(f"Cannot find a Vickery-Patil mask called {name}")
-            f"Cannot find a Vickery-Patil mask called {name}"
-        )
     mask_fname = _masks_path / "vickery-patil" / mask_fname
 
     return mask_fname

junifer/data/parcellations.py

@@ -18,8 +18,9 @@ import pandas as pd
 import requests
 from nilearn import datasets
 
-from .utils import closest_resolution
 from ..utils.logging import logger, raise_error
+from .utils import closest_resolution
+
 
 if TYPE_CHECKING:
     from nibabel import Nifti1Image

junifer/data/tests/test_data_utils.py

@@ -5,8 +5,8 @@
 
 from typing import List
 
-import pytest
 import numpy as np
+import pytest
 
 from junifer.data.utils import closest_resolution
 

junifer/data/tests/test_masks.py

@@ -11,10 +11,10 @@ import pytest
 from numpy.testing import assert_array_almost_equal
 
 from junifer.data.masks import (
+    _load_vickery_patil_mask,
+    list_masks,
     load_mask,
     register_mask,
-    list_masks,
-    _load_vickery_patil_mask,
 )
 
 

junifer/data/tests/test_parcellations.py

@@ -8,11 +8,10 @@
 from pathlib import Path
 from typing import List
 
-import pytest
-from numpy.testing import assert_array_almost_equal, assert_array_equal
-
 import nibabel as nib
+import pytest
 from nilearn.image import new_img_like
+from numpy.testing import assert_array_almost_equal, assert_array_equal
 
 from junifer.data.parcellations import (
     _retrieve_parcellation,

junifer/data/utils.py

@@ -1,5 +1,5 @@
 """Provide utilities for data module."""
-from typing import Optional, Union, List
+from typing import List, Optional, Union
 
 import numpy as np
 

junifer/datagrabber/aomic/tests/test_id1000.py

@@ -111,8 +111,8 @@ def test_aomic1000_datagrabber() -> None:
         assert out["DWI"]["path"].is_file()
 
         # asserts meta
-        assert "meta" in out
+        assert "meta" in out["BOLD"]
-        meta = out["meta"]
+        meta = out["BOLD"]["meta"]
         assert "element" in meta
         assert "subject" in meta["element"]
         assert test_element == meta["element"]["subject"]

junifer/datagrabber/aomic/tests/test_piop1.py

@@ -125,8 +125,8 @@ def test_aomic_piop1_datagrabber() -> None:
             assert out["DWI"]["path"].is_file()
 
             # asserts meta
-            assert "meta" in out
+            assert "meta" in out["BOLD"]
-            meta = out["meta"]
+            meta = out["BOLD"]["meta"]
             assert "element" in meta
             assert "subject" in meta["element"]
             assert sub == meta["element"]["subject"]

junifer/datagrabber/aomic/tests/test_piop2.py

@@ -121,8 +121,8 @@ def test_aomic_piop2_datagrabber() -> None:
             assert out["DWI"]["path"].is_file()
 
             # asserts meta
-            assert "meta" in out
+            assert "meta" in out["BOLD"]
-            meta = out["meta"]
+            meta = out["BOLD"]["meta"]
             assert "element" in meta
             assert "subject" in meta["element"]
             assert sub == meta["element"]["subject"]

junifer/datagrabber/base.py

@@ -9,11 +9,12 @@ from abc import ABC, abstractmethod
 from pathlib import Path
 from typing import Dict, Iterator, List, Tuple, Union
 
+from ..pipeline import UpdateMetaMixin
 from ..utils import logger, raise_error
 from .utils import validate_types
 
 
-class BaseDataGrabber(ABC):
+class BaseDataGrabber(ABC, UpdateMetaMixin):
     """Abstract base class for datagrabber.
 
     For every interface that is required, one needs to provide a concrete
@@ -78,10 +79,11 @@ class BaseDataGrabber(ABC):
         named_element = dict(zip(self.get_element_keys(), element))
         logger.debug(f"Named element: {named_element}")
         out = self.get_item(**named_element)
-        out["meta"] = {
+
-            "datagrabber": self.get_meta(),
+        for _, t_val in out.items():
-            "element": named_element,
+            self.update_meta(t_val, "datagrabber")
-        }
+            t_val["meta"]["element"] = named_element
+
         return out
 
     def __enter__(self) -> "BaseDataGrabber":
@@ -103,22 +105,6 @@ class BaseDataGrabber(ABC):
         """
         return self.types.copy()
 
-    def get_meta(self) -> Dict:
-        """Get metadata.
-
-        Returns
-        -------
-        dict
-            The metadata as dictionary.
-
-        """
-        t_meta = {}
-        t_meta["class"] = self.__class__.__name__
-        for k, v in vars(self).items():
-            if not k.startswith("_"):
-                t_meta[k] = v
-        return t_meta
-
     @property
     def datadir(self) -> Path:
         """Get data directory path.

junifer/datagrabber/datalad_base.py

@@ -83,7 +83,7 @@ class DataladDataGrabber(BaseDataGrabber):
         self._rootdir = rootdir
         # Flag to indicate if the dataset was cloned before and it might be
         # dirty
-        self._dataset_dirty = False
+        self.datalad_dirty = False
 
     @property
     def datadir(self) -> Path:
@@ -175,7 +175,7 @@ class DataladDataGrabber(BaseDataGrabber):
             # Check for dirty datasets:
             status = self._dataset.status()
             if any([x["state"] != "clean" for x in status]):
-                self._dataset_dirty = True
+                self.datalad_dirty = True
                 warn_with_log(
                     "At least one file is not clean, Junifer will "
                     "consider this dataset as dirty."
@@ -191,11 +191,10 @@ class DataladDataGrabber(BaseDataGrabber):
             logger.debug("Dataset installed")
         self._was_cloned = not isinstalled
 
-        self._datalad_commit_id = (
+        self.datalad_commit_id = self._dataset.repo.get_hexsha(  # type: ignore
-            self._dataset.repo.get_hexsha(  # type: ignore
+            self._dataset.repo.get_corresponding_branch()  # type: ignore
-                self._dataset.repo.get_corresponding_branch()  # type: ignore
-            )
         )
+        self.datalad_id = self._dataset.id
 
     def cleanup(self) -> None:
         """Cleanup the datalad dataset."""
@@ -245,21 +244,3 @@ class DataladDataGrabber(BaseDataGrabber):
         logger.debug("Cleaning up dataset")
         self.cleanup()
         logger.debug("Dataset state restored")
-
-    def get_meta(self) -> Dict:
-        """Get metadata.
-
-        Returns
-        -------
-        dict
-            The metadata as dictionary.
-
-        """
-        t_meta = super().get_meta()
-        t_meta["datalad_commit_id"] = self._datalad_commit_id
-
-        t_meta["datalad_id"] = self._dataset.id
-
-        # Set a flag to indicate that the dataset was dirty
-        t_meta["datalad_dirty"] = self._dataset_dirty
-        return t_meta

junifer/datagrabber/multiple.py

@@ -5,7 +5,6 @@
 #          Synchon Mandal <s.mandal@fz-juelich.de>
 # License: AGPL
 
-from pathlib import Path
 from typing import Dict, List, Tuple, Union
 
 from .base import BaseDataGrabber
@@ -38,7 +37,7 @@ class MultipleDataGrabber(BaseDataGrabber):
             raise ValueError("Datagrabbers have overlapping types.")
         self._datagrabbers = datagrabbers
 
-    def __getitem__(self, element: Union[str, Tuple]) -> Dict[str, Path]:
+    def __getitem__(self, element: Union[str, Tuple]) -> Dict:
         """Implement indexing.
 
         Parameters
@@ -58,9 +57,20 @@ class MultipleDataGrabber(BaseDataGrabber):
         """
 
         out = {}
+        metas = []
         for dg in self._datagrabbers:
             t_out = dg[element]
             out.update(t_out)
+            # Now get the meta for this datagrabber
+            t_meta = {}
+            dg.update_meta(t_meta, "datagrabber")
+            # Store all the sub-datagrabbers meta
+            metas.append(t_meta["meta"]["datagrabber"])
+
+        # Update all the metas again
+        for kind in out:
+            self.update_meta(out[kind], "datagrabber")
+            out[kind]["meta"]["datagrabber"]["datagrabbers"] = metas
         return out
 
     def get_item(self, **element: Dict) -> Dict[str, Dict]:
@@ -136,17 +146,3 @@ class MultipleDataGrabber(BaseDataGrabber):
         """
         types = [x for dg in self._datagrabbers for x in dg.get_types()]
         return types
-
-    def get_meta(self) -> Dict:
-        """Get metadata.
-
-        Returns
-        -------
-        dict
-            The metadata as dictionary.
-
-        """
-        t_meta = {}
-        t_meta["class"] = self.__class__.__name__
-        t_meta["datagrabbers"] = [dg.get_meta() for dg in self._datagrabbers]
-        return t_meta

junifer/datagrabber/tests/test_base.py

@@ -23,7 +23,7 @@ def test_BaseDataGrabber() -> None:
     # Create concrete class.
     class MyDataGrabber(BaseDataGrabber):
         def get_item(self, subject):
-            return {}
+            return {"BOLD": {}}
 
         def get_elements(self):
             return super().get_elements()
@@ -31,22 +31,24 @@ def test_BaseDataGrabber() -> None:
         def get_element_keys(self):
             return ["subject"]
 
-    dg = MyDataGrabber(datadir="/tmp", types=["func"])
+    dg = MyDataGrabber(datadir="/tmp", types=["BOLD"])
-    elem = dg["elem"]
+    elem = dg["sub01"]
-    assert "meta" in elem
+    assert "BOLD" in elem
-    assert "datagrabber" in elem["meta"]
+    assert "meta" in elem["BOLD"]
-    assert "class" in elem["meta"]["datagrabber"]
+    meta = elem["BOLD"]["meta"]
-    assert MyDataGrabber.__name__ in elem["meta"]["datagrabber"]["class"]
+    assert "datagrabber" in meta
-    assert "element" in elem["meta"]
+    assert "class" in meta["datagrabber"]
-    assert "subject" in elem["meta"]["element"]
+    assert MyDataGrabber.__name__ in meta["datagrabber"]["class"]
-    assert "elem" in elem["meta"]["element"]["subject"]
+    assert "element" in meta
+    assert "subject" in meta["element"]
+    assert "sub01" in meta["element"]["subject"]
 
     with pytest.raises(NotImplementedError):
         dg.get_elements()
 
     with dg:
         assert dg.datadir == Path("/tmp")
-        assert dg.types == ["func"]
+        assert dg.types == ["BOLD"]
 
     class MyDataGrabber2(BaseDataGrabber):
         def get_item(self, subject):
@@ -58,7 +60,7 @@ def test_BaseDataGrabber() -> None:
         def get_element_keys(self):
             return super().get_element_keys()
 
-    dg = MyDataGrabber2(datadir="/tmp", types=["func"])
+    dg = MyDataGrabber2(datadir="/tmp", types=["BOLD"])
     with pytest.raises(NotImplementedError):
         dg.get_element_keys()
 

junifer/datagrabber/tests/test_datalad_base.py

@@ -11,6 +11,7 @@ import pytest
 
 from junifer.datagrabber.datalad_base import DataladDataGrabber
 
+
 _testing_dataset = {
     "example_bids": {
         "uri": "https://gin.g-node.org/juaml/datalad-example-bids",
@@ -143,10 +144,11 @@ def test_datalad_clone_cleanup(
         assert elem1_t1w.is_file() is False
         assert elem1_t1w.is_symlink() is True
         elem1 = dg["sub-01"]
-        assert "meta" in elem1
+        assert "meta" in elem1["BOLD"]
-        assert "datagrabber" in elem1["meta"]
+        meta = elem1["BOLD"]["meta"]
-        assert "datalad_dirty" in elem1["meta"]["datagrabber"]
+        assert "datagrabber" in meta
-        assert elem1["meta"]["datagrabber"]["datalad_dirty"] is False
+        assert "datalad_dirty" in meta["datagrabber"]
+        assert meta["datagrabber"]["datalad_dirty"] is False
         assert hasattr(dg, "_got_files") is False
         assert datadir.exists() is True
         assert elem1_bold.is_file() is True
@@ -198,14 +200,15 @@ def test_datalad_previously_cloned(
         assert datadir.exists() is True
         assert dg._was_cloned is False
         elem1 = dg["sub-01"]
-        assert "meta" in elem1
+        assert "meta" in elem1["BOLD"]
-        assert "datagrabber" in elem1["meta"]
+        meta = elem1["BOLD"]["meta"]
-        assert "datalad_dirty" in elem1["meta"]["datagrabber"]
+        assert "datagrabber" in meta
-        assert elem1["meta"]["datagrabber"]["datalad_dirty"] is False
+        assert "datalad_dirty" in meta["datagrabber"]
-        assert "datalad_commit_id" in elem1["meta"]["datagrabber"]
+        assert meta["datagrabber"]["datalad_dirty"] is False
-        assert elem1["meta"]["datagrabber"]["datalad_commit_id"] == commit
+        assert "datalad_commit_id" in meta["datagrabber"]
-        assert "datalad_id" in elem1["meta"]["datagrabber"]
+        assert meta["datagrabber"]["datalad_commit_id"] == commit
-        assert elem1["meta"]["datagrabber"]["datalad_id"] == remote_id
+        assert "datalad_id" in meta["datagrabber"]
+        assert meta["datagrabber"]["datalad_id"] == remote_id
 
         assert hasattr(dg, "_got_files") is True
         # Files are there and symlinks are fixed
@@ -264,7 +267,8 @@ def test_datalad_previously_cloned_and_get(
     assert elem1_t1w.is_file() is False
 
     dl.get(  # type: ignore
-        elem1_t1w, dataset=datadir, result_renderer="disabled")
+        elem1_t1w, dataset=datadir, result_renderer="disabled"
+    )
 
     assert elem1_bold.is_symlink() is True
     assert elem1_bold.is_file() is False
@@ -275,14 +279,15 @@ def test_datalad_previously_cloned_and_get(
         assert datadir.exists() is True
         assert dg._was_cloned is False
         elem1 = dg["sub-01"]
-        assert "meta" in elem1
+        assert "meta" in elem1["BOLD"]
-        assert "datagrabber" in elem1["meta"]
+        meta = elem1["BOLD"]["meta"]
-        assert "datalad_dirty" in elem1["meta"]["datagrabber"]
+        assert "datagrabber" in meta
-        assert elem1["meta"]["datagrabber"]["datalad_dirty"] is False
+        assert "datalad_dirty" in meta["datagrabber"]
-        assert "datalad_commit_id" in elem1["meta"]["datagrabber"]
+        assert meta["datagrabber"]["datalad_dirty"] is False
-        assert elem1["meta"]["datagrabber"]["datalad_commit_id"] == commit
+        assert "datalad_commit_id" in meta["datagrabber"]
-        assert "datalad_id" in elem1["meta"]["datagrabber"]
+        assert meta["datagrabber"]["datalad_commit_id"] == commit
-        assert elem1["meta"]["datagrabber"]["datalad_id"] == remote_id
+        assert "datalad_id" in meta["datagrabber"]
+        assert meta["datagrabber"]["datalad_id"] == remote_id
 
         assert hasattr(dg, "_got_files") is True
         # Files are there and symlinks are fixed
@@ -344,7 +349,8 @@ def test_datalad_previously_cloned_and_get_dirty(
     assert elem1_t1w.is_file() is False
 
     dl.get(  # type: ignore
-        elem1_t1w, dataset=datadir, result_renderer="disabled")
+        elem1_t1w, dataset=datadir, result_renderer="disabled"
+    )
 
     assert elem1_bold.is_symlink() is True
     assert elem1_bold.is_file() is False
@@ -359,14 +365,15 @@ def test_datalad_previously_cloned_and_get_dirty(
         assert datadir.exists() is True
         assert dg._was_cloned is False
         elem1 = dg["sub-01"]
-        assert "meta" in elem1
+        assert "meta" in elem1["BOLD"]
-        assert "datagrabber" in elem1["meta"]
+        meta = elem1["BOLD"]["meta"]
-        assert "datalad_dirty" in elem1["meta"]["datagrabber"]
+        assert "datagrabber" in meta
-        assert elem1["meta"]["datagrabber"]["datalad_dirty"] is True
+        assert "datalad_dirty" in meta["datagrabber"]
-        assert "datalad_commit_id" in elem1["meta"]["datagrabber"]
+        assert meta["datagrabber"]["datalad_dirty"] is True
-        assert elem1["meta"]["datagrabber"]["datalad_commit_id"] == commit
+        assert "datalad_commit_id" in meta["datagrabber"]
-        assert "datalad_id" in elem1["meta"]["datagrabber"]
+        assert meta["datagrabber"]["datalad_commit_id"] == commit
-        assert elem1["meta"]["datagrabber"]["datalad_id"] == remote_id
+        assert "datalad_id" in meta["datagrabber"]
+        assert meta["datagrabber"]["datalad_id"] == remote_id
 
         assert hasattr(dg, "_got_files") is True
         # Files are there and symlinks are fixed
@@ -384,17 +391,18 @@ def test_datalad_previously_cloned_and_get_dirty(
         assert datadir.exists() is True
         assert dg._was_cloned is False
         elem2 = dg["sub-02"]
-        assert "meta" in elem2
+        assert "meta" in elem1["BOLD"]
-        assert "datagrabber" in elem2["meta"]
+        meta = elem2["BOLD"]["meta"]
-        assert "datalad_dirty" in elem2["meta"]["datagrabber"]
+        assert "datagrabber" in meta
+        assert "datalad_dirty" in meta["datagrabber"]
 
         # Dataset is still dirty due to subject sub-01
-        assert elem2["meta"]["datagrabber"]["datalad_dirty"] is True
+        assert meta["datagrabber"]["datalad_dirty"] is True
 
-        assert "datalad_commit_id" in elem2["meta"]["datagrabber"]
+        assert "datalad_commit_id" in meta["datagrabber"]
-        assert elem2["meta"]["datagrabber"]["datalad_commit_id"] == commit
+        assert meta["datagrabber"]["datalad_commit_id"] == commit
-        assert "datalad_id" in elem2["meta"]["datagrabber"]
+        assert "datalad_id" in meta["datagrabber"]
-        assert elem2["meta"]["datagrabber"]["datalad_id"] == remote_id
+        assert meta["datagrabber"]["datalad_id"] == remote_id
 
         assert hasattr(dg, "_got_files") is True
         # Files are there and symlinks are fixed

junifer/datagrabber/tests/test_hcp.py

@@ -10,6 +10,7 @@ import pytest
 from junifer.datagrabber.hcp import DataladHCP1200
 from junifer.utils import configure_logging
 
+
 URI = "https://gin.g-node.org/juaml/datalad-example-hcp1200"
 
 
@@ -79,8 +80,8 @@ def test_dataladhcp1200_datagrabber(
         # Assert data file path is a file
         assert out["BOLD"]["path"].is_file()
         # Assert metadata
-        assert "meta" in out
+        assert "meta" in out["BOLD"]
-        meta = out["meta"]
+        meta = out["BOLD"]["meta"]
         assert "element" in meta
         assert "subject" in meta["element"]
         assert test_element[0] == meta["element"]["subject"]

junifer/datagrabber/tests/test_multiple.py

@@ -7,6 +7,7 @@ import pytest
 
 from junifer.datagrabber import MultipleDataGrabber, PatternDataladDataGrabber
 
+
 _testing_dataset = {
     "example_bids": {
         "uri": "https://gin.g-node.org/juaml/datalad-example-bids",
@@ -63,17 +64,17 @@ def test_multiple() -> None:
         subs = [x for x in dg]
         assert set(subs) == set(expected_subs)
 
-        data = dg[("sub-01", "ses-01")]
+        elem = dg[("sub-01", "ses-01")]
-        assert "T1w" in data
+        assert "T1w" in elem
-        assert "BOLD" in data
+        assert "BOLD" in elem
-
+        assert "meta" in elem["BOLD"]
-    meta = dg.get_meta()
+        meta = elem["BOLD"]["meta"]["datagrabber"]
-    assert "class" in meta
+        assert "class" in meta
-    assert meta["class"] == "MultipleDataGrabber"
+        assert meta["class"] == "MultipleDataGrabber"
-    assert "datagrabbers" in meta
+        assert "datagrabbers" in meta
-    assert len(meta["datagrabbers"]) == 2
+        assert len(meta["datagrabbers"]) == 2
-    assert meta["datagrabbers"][0]["class"] == "PatternDataladDataGrabber"
+        assert meta["datagrabbers"][0]["class"] == "PatternDataladDataGrabber"
-    assert meta["datagrabbers"][1]["class"] == "PatternDataladDataGrabber"
+        assert meta["datagrabbers"][1]["class"] == "PatternDataladDataGrabber"
 
 
 def test_multiple_no_intersection() -> None:

junifer/datagrabber/tests/test_pattern.py

@@ -256,6 +256,6 @@ def test_PatternDataGrabber(tmp_path: Path) -> None:
     out1 = datagrabber[("sub000", "ses000", "task002")]
     out2 = datagrabber[("sub000", "ses000", "task003")]
 
-    assert out1["func"] == out2["func"]
+    assert out1["func"]["path"] == out2["func"]["path"]
-    assert out1["anat"] == out2["anat"]
+    assert out1["anat"]["path"] == out2["anat"]["path"]
-    assert out1["vbm"] != out2["vbm"]
+    assert out1["vbm"]["path"] != out2["vbm"]["path"]

junifer/datagrabber/tests/test_pattern_datalad.py

@@ -11,6 +11,7 @@ import pytest
 
 from junifer.datagrabber.pattern_datalad import PatternDataladDataGrabber
 
+
 _testing_dataset = {
     "example_bids": {
         "uri": "https://gin.g-node.org/juaml/datalad-example-bids",
@@ -81,9 +82,10 @@ def test_bids_PatternDataladDataGrabber(tmp_path: Path) -> None:
                 dg.datadir / f"{elem}/func/{elem}_task-rest_bold.nii.gz"
             )
 
-            assert "meta" in t_sub
+            assert "meta" in t_sub["BOLD"]
-            assert "datagrabber" in t_sub["meta"]
+            meta = t_sub["BOLD"]["meta"]
-            dg_meta = t_sub["meta"]["datagrabber"]
+            assert "datagrabber" in meta
+            dg_meta = meta["datagrabber"]
             assert "class" in dg_meta
             assert dg_meta["class"] == "PatternDataladDataGrabber"
             assert "uri" in dg_meta

junifer/datareader/default.py

@@ -11,10 +11,11 @@ import nibabel as nib
 import pandas as pd
 
 from ..api.decorators import register_datareader
-from ..pipeline import PipelineStepMixin
+from ..pipeline import PipelineStepMixin, UpdateMetaMixin
 from ..utils.logging import logger, warn_with_log
 
-# Map each file extension to a kind
+
+# Map each file extension to a type
 _extensions = {
     ".nii": "NIFTI",
     ".nii.gz": "NIFTI",
@@ -22,7 +23,7 @@ _extensions = {
     ".tsv": "TSV",
 }
 
-# Map each kind to a function and arguments
+# Map each type to a function and arguments
 _readers = {}
 _readers["NIFTI"] = {"func": nib.load, "params": None}
 _readers["CSV"] = {"func": pd.read_csv, "params": None}
@@ -30,7 +31,7 @@ _readers["TSV"] = {"func": pd.read_csv, "params": {"sep": "\t"}}
 
 
 @register_datareader
-class DefaultDataReader(PipelineStepMixin):
+class DefaultDataReader(PipelineStepMixin, UpdateMetaMixin):
     """Mixin class for default data reader."""
 
     def validate_input(self, input: List[str]) -> None:
@@ -46,8 +47,8 @@ class DefaultDataReader(PipelineStepMixin):
         # Nothing to validate, any input is fine
         pass
 
-    def get_output_kind(self, input: List[str]) -> List[str]:
+    def get_output_type(self, input: List[str]) -> List[str]:
-        """Get output kind.
+        """Get output type.
 
         Parameters
         ----------
@@ -58,10 +59,10 @@ class DefaultDataReader(PipelineStepMixin):
         Returns
         -------
         list of str
-            The updated list of output kinds, as reading possibilities.
+            The updated list of output types, as reading possibilities.
 
         """
-        # It will output the same kind of data as the input
+        # It will output the same type of data as the input
         return input
 
     def fit_transform(
@@ -82,36 +83,33 @@ class DefaultDataReader(PipelineStepMixin):
         -------
         dict
             The processed output as dictionary. The "data" key is added to
-            each data type dictionary except "meta".
+            each data type dictionary.
 
         """
-        # For each kind of data, try to read it
+        # For each type of data, try to read it
         out = input.copy()
         if params is None:
             params = {}
-        for kind in input.keys():
+        for type_ in input.keys():
-            if kind == "meta":
+            if "path" not in input[type_]:
-                out["meta"] = input["meta"]
-                continue
-            if "path" not in input[kind]:
                 warn_with_log(
-                    f"Input kind {kind} does not provide a path. Skipping."
+                    f"Input type {type_} does not provide a path. Skipping."
                 )
                 continue
-            t_path = input[kind]["path"]
+            t_path = input[type_]["path"]
-            t_params = params.get(kind, {})
+            t_params = params.get(type_, {})
 
             # Convert to Path if datareader is not well done
             if not isinstance(t_path, Path):
                 t_path = Path(t_path)
-                out[kind]["path"] = t_path
+                out[type_]["path"] = t_path
-            logger.info(f"Reading {kind} from {t_path.as_posix()}")
+            logger.info(f"Reading {type_} from {t_path.as_posix()}")
             fread = None
 
             fname = t_path.name.lower()
             for ext, ftype in _extensions.items():
                 if fname.endswith(ext):
-                    logger.info(f"{kind} is type {ftype}")
+                    logger.info(f"{type_} is type {ftype}")
                     reader_func = _readers[ftype]["func"]
                     reader_params = _readers[ftype]["params"]
                     if reader_params is not None:
@@ -123,8 +121,6 @@ class DefaultDataReader(PipelineStepMixin):
                 logger.info(
                     f"Unknown file type {t_path.as_posix()}, skipping reading"
                 )
-            out[kind]["data"] = fread
+            out[type_]["data"] = fread
-            if "meta" not in out:
+            self.update_meta(out[type_], "datareader")
-                out["meta"] = {}
-            out["meta"]["datareader"] = self.get_meta()
         return out

junifer/datareader/tests/test_default_reader.py

@@ -17,37 +17,36 @@ from junifer.datareader import DefaultDataReader
 
 
 @pytest.mark.parametrize(
-    "kind", [["T1w", "BOLD", "T2", "dwi"], [], None, ["whatever"]]
+    "type_", [["T1w", "BOLD", "T2", "dwi"], [], ["whatever"]]
 )
-def test_validation(kind) -> None:
+def test_validation(type_) -> None:
     """Test validating input/output.
 
     Parameters
     ----------
-    kind : list of str or str or None
+    type_ : list of str or str or None
-        The parametrized kind of data.
+        The parametrized type_ of data.
 
     """
     reader = DefaultDataReader()
-    assert reader.validate_input(kind) is None
+    assert reader.validate_input(type_) is None
-    assert reader.get_output_kind(kind) == kind
+    assert reader.get_output_type(type_) == type_
-    assert reader.validate(kind) == kind
+    assert reader.validate(type_) == type_
 
 
 def test_meta() -> None:
     """Test reader metadata."""
     reader = DefaultDataReader()
-    t_meta = reader.get_meta()
-    assert t_meta["class"] == "DefaultDataReader"
 
     nib_data_path = Path(nib_testing.data_path)
     t_path = nib_data_path / "example4d.nii.gz"
     input = {"BOLD": {"path": t_path}}
     output = reader.fit_transform(input)
-    assert "meta" in output
+    assert "meta" in output["BOLD"]
-    assert "datareader" in output["meta"]
+    meta = output["BOLD"]["meta"]
-    assert "class" in output["meta"]["datareader"]
+    assert "datareader" in meta
-    assert output["meta"]["datareader"]["class"] == "DefaultDataReader"
+    assert "class" in meta["datareader"]
+    assert meta["datareader"]["class"] == "DefaultDataReader"
 
 
 @pytest.mark.parametrize(

junifer/markers/base.py

@@ -7,14 +7,15 @@
 from abc import ABC, abstractmethod
 from typing import TYPE_CHECKING, Any, Dict, List, Optional, Union
 
-from ..pipeline import PipelineStepMixin
+from ..pipeline import PipelineStepMixin, UpdateMetaMixin
 from ..utils import logger, raise_error
 
+
 if TYPE_CHECKING:
     from junifer.storage import BaseFeatureStorage
 
 
-class BaseMarker(ABC, PipelineStepMixin):
+class BaseMarker(ABC, PipelineStepMixin, UpdateMetaMixin):
     """Abstract base class for all markers.
 
     Parameters
@@ -57,27 +58,6 @@ class BaseMarker(ABC, PipelineStepMixin):
             klass=NotImplementedError,
         )
 
-    def get_meta(self, kind: str) -> Dict:
-        """Get metadata.
-
-        Parameters
-        ----------
-        kind : str
-            The kind of pipeline step.
-
-        Returns
-        -------
-        dict
-            The metadata as a dictionary with the only key 'marker'.
-
-        """
-        s_meta = super().get_meta()
-        # same marker can be "fit"ted into different kinds, so the name
-        # is created from the kind and the name of the marker
-        s_meta["name"] = f"{kind}_{self.name}"
-        s_meta["kind"] = kind
-        return {"marker": s_meta}
-
     def validate_input(self, input: List[str]) -> None:
         """Validate input.
 
@@ -101,23 +81,22 @@ class BaseMarker(ABC, PipelineStepMixin):
             )
 
     @abstractmethod
-    def get_output_kind(self, input: List[str]) -> List[str]:
+    def get_output_type(self, input_type: str) -> str:
-        """Get output kind.
+        """Get output type.
 
         Parameters
         ----------
-        input : list of str
+        input_type : str
-            The input to the marker. The list must contain the
+            The data type input to the marker.
-            available Junifer Data dictionary keys.
 
         Returns
         -------
-        list of str
+        str
-            The updated list of output kinds, as storage possibilities.
+            The storage type output by the marker.
 
         """
         raise_error(
-            msg="Concrete classes need to implement get_output_kind().",
+            msg="Concrete classes need to implement get_output_type().",
             klass=NotImplementedError,
         )
 
@@ -149,10 +128,9 @@ class BaseMarker(ABC, PipelineStepMixin):
             klass=NotImplementedError,
         )
 
-    @abstractmethod
     def store(
         self,
-        kind: str,
+        type_: str,
         out: Dict[str, Any],
         storage: "BaseFeatureStorage",
     ) -> None:
@@ -160,18 +138,17 @@ class BaseMarker(ABC, PipelineStepMixin):
 
         Parameters
         ----------
-        kind : str
+        type_ : str
-            The data kind to store.
+            The data type to store.
         out : dict
             The computed result as a dictionary to store.
         storage : storage-like
-            The storage class.
+            The storage class, for example, SQLiteFeatureStorage.
 
         """
-        raise_error(
+        output_type_ = self.get_output_type(type_)
-            msg="Concrete classes need to implement store().",
+        logger.debug(f"Storing {output_type_} in {storage}")
-            klass=NotImplementedError,
+        storage.store(kind=output_type_, **out)
-        )
 
     def fit_transform(
         self,
@@ -195,23 +172,25 @@ class BaseMarker(ABC, PipelineStepMixin):
 
         """
         out = {}
-        meta = input.get("meta", {})
+        for type_ in self._on:
-        for kind in self._on:
+            if type_ in input.keys():
-            if kind in input.keys():
+                logger.info(f"Computing {type_}")
-                logger.info(f"Computing {kind}")
+                t_input = input[type_]
-                t_input = input[kind]
                 extra_input = input.copy()
-                extra_input.pop(kind)
+                extra_input.pop(type_)
-                t_meta = meta.copy()
+                t_meta = t_input["meta"].copy()
-                t_meta.update(t_input.get("meta", {}))
+                t_meta["type"] = type_
-                t_meta.update(self.get_meta(kind))
+
                 t_out = self.compute(input=t_input, extra_input=extra_input)
-                t_out.update(meta=t_meta)
+                t_out["meta"] = t_meta
+
+                self.update_meta(t_out, "marker")
+
                 if storage is not None:
                     logger.info(f"Storing in {storage}")
-                    self.store(kind=kind, out=t_out, storage=storage)
+                    self.store(type_=type_, out=t_out, storage=storage)
                 else:
                     logger.info("No storage specified, returning dictionary")
-                    out[kind] = t_out
+                    out[type_] = t_out
 
         return out

junifer/markers/collection.py

@@ -13,6 +13,7 @@ from ..pipeline import PipelineStepMixin
 from ..storage.base import BaseFeatureStorage
 from ..utils import logger
 
+
 if TYPE_CHECKING:
     from junifer.datagrabber import BaseDataGrabber
 

junifer/markers/crossparcellation_functional_connectivity.py

@@ -9,7 +9,6 @@ from typing import Any, Dict, List, Optional
 import pandas as pd
 
 from ..api.decorators import register_marker
-from ..storage import BaseFeatureStorage
 from ..utils import logger
 from ..utils.logging import raise_error
 from .base import BaseMarker
@@ -41,6 +40,8 @@ class CrossParcellationFC(BaseMarker):
         (default None).
     """
 
+    _DEPENDENCIES = {"nilearn"}
+
     def __init__(
         self,
         parcellation_one: str,
@@ -72,43 +73,21 @@ class CrossParcellationFC(BaseMarker):
         """
         return ["BOLD"]
 
-    def get_output_kind(self, input: List[str]) -> List[str]:
+    def get_output_type(self, input_type: str) -> str:
-        """Get output kind.
+        """Get output type.
 
         Parameters
         ----------
-        input : list of str
+        input_type : str
-            The input to the marker. The list must contain the
+            The data type input to the marker.
-            available Junifer Data dictionary keys.
 
         Returns
         -------
-        list of str
+        str
-            The updated list of output kinds, as storage possibilities.
+            The storage type output by the marker.
 
         """
-        return ["matrix"]
+        return "matrix"
-
-    def store(
-        self,
-        kind,
-        out: Dict[str, Any],
-        storage: "BaseFeatureStorage",
-    ) -> None:
-        """Store.
-
-        Parameters
-        ----------
-        kind : {"BOLD"}
-            The data kind to store.
-        out : dict
-            The computed result as a dictionary to store.
-        storage : storage-like
-            The storage class, for example, SQLiteFeatureStorage.
-
-        """
-        logger.debug(f"Storing BOLD-based marker in {storage}")
-        storage.store(kind="matrix", **out)
 
     def compute(
         self,

junifer/markers/ets_rss.py

@@ -6,7 +6,7 @@
 #          Synchon Mandal <s.mandal@fz-juelich.de>
 # License: AGPL
 
-from typing import TYPE_CHECKING, Any, Dict, List, Optional, Union
+from typing import Any, Dict, List, Optional, Union
 
 import numpy as np
 
@@ -16,9 +16,6 @@ from .base import BaseMarker
 from .parcel_aggregation import ParcelAggregation
 from .utils import _ets
 
-if TYPE_CHECKING:
-    from junifer.storage import BaseFeatureStorage
-
 
 @register_marker
 class RSSETSMarker(BaseMarker):
@@ -45,6 +42,8 @@ class RSSETSMarker(BaseMarker):
 
     """
 
+    _DEPENDENCIES = {"nilearn"}
+
     def __init__(
         self,
         parcellation: Union[str, List[str]],
@@ -70,43 +69,21 @@ class RSSETSMarker(BaseMarker):
         """
         return ["BOLD"]
 
-    def get_output_kind(self, input: List[str]) -> List[str]:
+    def get_output_type(self, input_type: str) -> str:
-        """Get output kind.
+        """Get output type.
 
         Parameters
         ----------
-        input : list of str
+        input_type : str
-            The input to the marker. The list must contain the
+            The data type input to the marker.
-            available Junifer Data dictionary keys.
 
         Returns
         -------
-        list of str
+        str
-            The updated list of output kinds, as storage possibilities.
+            The storage type output by the marker.
 
         """
-        return ["timeseries"]
+        return "timeseries"
-
-    def store(
-        self,
-        kind: str,
-        out: Dict[str, Any],
-        storage: "BaseFeatureStorage",
-    ) -> None:
-        """Store.
-
-        Parameters
-        ----------
-        kind : {"BOLD"}
-            The data kind to store.
-        out : dict
-            The computed result as a dictionary to store.
-        storage : storage-like
-            The storage class, for example, SQLiteFeatureStorage.
-
-        """
-        logger.debug(f"Storing BOLD in {storage}")
-        storage.store(kind="timeseries", **out)
 
     def compute(
         self,
@@ -150,7 +127,7 @@ class RSSETSMarker(BaseMarker):
             parcellation=self.parcellation,
             method=self.agg_method,
             method_params=self.agg_method_params,
-            mask=self.mask
+            mask=self.mask,
         )
         # Compute the parcel aggregation
         out = parcel_aggregation.compute(input=input, extra_input=extra_input)

junifer/markers/functional_connectivity_parcels.py

@@ -4,19 +4,15 @@
 #          Kaustubh R. Patil <k.patil@fz-juelich.de>
 # License: AGPL
 
-from typing import TYPE_CHECKING, Any, Dict, List, Optional, Union
+from typing import Any, Dict, List, Optional, Union
 
 from nilearn.connectome import ConnectivityMeasure
 from sklearn.covariance import EmpiricalCovariance
 
 from ..api.decorators import register_marker
-from ..utils import logger
 from .base import BaseMarker
 from .parcel_aggregation import ParcelAggregation
 
-if TYPE_CHECKING:
-    from junifer.storage import BaseFeatureStorage
-
 
 @register_marker
 class FunctionalConnectivityParcels(BaseMarker):
@@ -49,6 +45,8 @@ class FunctionalConnectivityParcels(BaseMarker):
         None).
     """
 
+    _DEPENDENCIES = {"nilearn", "scikit-learn"}
+
     def __init__(
         self,
         parcellation: Union[str, List[str]],
@@ -83,22 +81,21 @@ class FunctionalConnectivityParcels(BaseMarker):
         """
         return ["BOLD"]
 
-    def get_output_kind(self, input: List[str]) -> List[str]:
+    def get_output_type(self, input_type: str) -> str:
-        """Get output kind.
+        """Get output type.
 
         Parameters
         ----------
-        input : list of str
+        input_type : str
-            The input to the marker. The list must contain the
+            The data type input to the marker.
-            available Junifer Data dictionary keys.
 
         Returns
         -------
-        list of str
+        str
-            The updated list of output kinds, as storage possibilities.
+            The storage type output by the marker.
+
         """
-        outputs = ["matrix"]
+        return "matrix"
-        return outputs
 
     def compute(
         self,
@@ -154,24 +151,3 @@ class FunctionalConnectivityParcels(BaseMarker):
         out["col_names"] = ts["columns"]
         out["matrix_kind"] = "tril"
         return out
-
-    def store(
-        self,
-        kind: str,
-        out: Dict[str, Any],
-        storage: "BaseFeatureStorage",
-    ) -> None:
-        """Store.
-
-        Parameters
-        ----------
-        kind : {"BOLD"}
-            The data kind to store.
-        out : dict
-            The computed result as a dictionary to store.
-        storage : storage-like
-            The storage class, for example, SQLiteFeatureStorage.
-
-        """
-        logger.debug(f"Storing {kind} in {storage}")
-        storage.store(kind="matrix", **out)

junifer/markers/functional_connectivity_spheres.py

@@ -4,19 +4,16 @@
 #          Kaustubh R. Patil <k.patil@fz-juelich.de>
 # License: AGPL
 
-from typing import TYPE_CHECKING, Any, Dict, List, Optional
+from typing import Any, Dict, List, Optional
 
 from nilearn.connectome import ConnectivityMeasure
 from sklearn.covariance import EmpiricalCovariance
 
 from ..api.decorators import register_marker
-from ..utils import logger, raise_error
+from ..utils import raise_error
 from .base import BaseMarker
 from .sphere_aggregation import SphereAggregation
 
-if TYPE_CHECKING:
-    from junifer.storage import BaseFeatureStorage
-
 
 @register_marker
 class FunctionalConnectivitySpheres(BaseMarker):
@@ -54,6 +51,8 @@ class FunctionalConnectivitySpheres(BaseMarker):
 
     """
 
+    _DEPENDENCIES = {"nilearn", "scikit-learn"}
+
     def __init__(
         self,
         coords: str,
@@ -93,23 +92,21 @@ class FunctionalConnectivitySpheres(BaseMarker):
         """
         return ["BOLD"]
 
-    def get_output_kind(self, input: List[str]) -> List[str]:
+    def get_output_type(self, input_type: str) -> str:
-        """Get output kind.
+        """Get output type.
 
         Parameters
         ----------
-        input : list of str
+        input_type : str
-            The input to the marker. The list must contain the
+            The data type input to the marker.
-            available Junifer Data dictionary keys.
 
         Returns
         -------
-        list of str
+        str
-            The updated list of output kinds, as storage possibilities.
+            The storage type output by the marker.
 
         """
-        outputs = ["matrix"]
+        return "matrix"
-        return outputs
 
     def compute(
         self,
@@ -166,24 +163,3 @@ class FunctionalConnectivitySpheres(BaseMarker):
         out["col_names"] = ts["columns"]
         out["matrix_kind"] = "tril"
         return out
-
-    def store(
-        self,
-        kind: str,
-        out: Dict[str, Any],
-        storage: "BaseFeatureStorage",
-    ) -> None:
-        """Store.
-
-        Parameters
-        ----------
-        kind : {"BOLD"}
-            The data kind to store.
-        out : dict
-            The computed result as a dictionary to store.
-        storage : storage-like
-            The storage class, for example, SQLiteFeatureStorage.
-
-        """
-        logger.debug(f"Storing {kind} in {storage}")
-        storage.store(kind="matrix", **out)

junifer/markers/parcel_aggregation.py

@@ -4,21 +4,18 @@
 #          Synchon Mandal <s.mandal@fz-juelich.de>
 # License: AGPL
 
-from typing import TYPE_CHECKING, Any, Dict, List, Optional, Union
+from typing import Any, Dict, List, Optional, Union
 
 import numpy as np
-from nilearn.image import math_img, resample_to_img, new_img_like
+from nilearn.image import math_img, new_img_like, resample_to_img
 from nilearn.maskers import NiftiMasker
 
 from ..api.decorators import register_marker
-from ..data import load_parcellation, load_mask
+from ..data import load_mask, load_parcellation
 from ..stats import get_aggfunc_by_name
 from ..utils import logger
 from .base import BaseMarker
 
-if TYPE_CHECKING:
-    from junifer.storage import BaseFeatureStorage
-
 
 @register_marker
 class ParcelAggregation(BaseMarker):
@@ -48,6 +45,8 @@ class ParcelAggregation(BaseMarker):
         None).
     """
 
+    _DEPENDENCIES = {"nilearn", "numpy"}
+
     def __init__(
         self,
         parcellation: Union[str, List[str]],
@@ -76,53 +75,27 @@ class ParcelAggregation(BaseMarker):
         """
         return ["T1w", "BOLD", "VBM_GM", "VBM_WM", "fALFF", "GCOR", "LCOR"]
 
-    def get_output_kind(self, input: List[str]) -> List[str]:
+    def get_output_type(self, input_type: str) -> str:
-        """Get output kind.
+        """Get output type.
 
         Parameters
         ----------
-        input : list of str
+        input_type : str
-            The kind of data to work on.
+            The data type input to the marker.
 
         Returns
         -------
-        list of str
+        str
-            The list of storage kinds.
+            The storage type output by the marker.
 
         """
-        outputs = []
-        for t_input in input:
-            if t_input in ["VBM_GM", "VBM_WM", "fALFF", "GCOR", "LCOR"]:
-                outputs.append("table")
-            elif t_input in ["BOLD"]:
-                outputs.append("timeseries")
-            else:
-                raise ValueError(f"Unknown input kind for {t_input}")
-        return outputs
 
-    def store(
+        if input_type in ["VBM_GM", "VBM_WM", "fALFF", "GCOR", "LCOR"]:
-        self,
+            return "table"
-        kind: str,
+        elif input_type == "BOLD":
-        out: Dict[str, Any],
+            return "timeseries"
-        storage: "BaseFeatureStorage",
+        else:
-    ) -> None:
+            raise ValueError(f"Unknown input kind for {input_type}")
-        """Store.
-
-        Parameters
-        ----------
-        kind : {"BOLD", "VBM_GM", "VBM_WM", "fALFF", "GCOR", "LCOR"}
-            The data kind to store.
-        out : dict
-            The computed result as a dictionary to store.
-        storage : storage-like
-            The storage class, for example, SQLiteFeatureStorage.
-
-        """
-        logger.debug(f"Storing {kind} in {storage}")
-        if kind in ["VBM_GM", "VBM_WM", "fALFF", "GCOR", "LCOR"]:
-            storage.store(kind="table", **out)
-        elif kind in ["BOLD"]:
-            storage.store(kind="timeseries", **out)
 
     def compute(
         self,
@@ -252,6 +225,4 @@ class ParcelAggregation(BaseMarker):
 
         out_values = np.array(out_values).T
         out = {"data": out_values, "columns": out_labels}
-        if out_values.shape[0] > 1:
-            out["row_names"] = "scan"
         return out

junifer/markers/sphere_aggregation.py

@@ -4,7 +4,7 @@
 #          Synchon Mandal <s.mandal@fz-juelich.de>
 # License: AGPL
 
-from typing import TYPE_CHECKING, Any, Dict, List, Optional, Union
+from typing import Any, Dict, List, Optional, Union
 
 from ..api.decorators import register_marker
 from ..data import load_coordinates, load_mask
@@ -13,9 +13,6 @@ from ..stats import get_aggfunc_by_name
 from ..utils import logger
 from .base import BaseMarker
 
-if TYPE_CHECKING:
-    from junifer.storage import BaseFeatureStorage
-
 
 @register_marker
 class SphereAggregation(BaseMarker):
@@ -51,6 +48,8 @@ class SphereAggregation(BaseMarker):
 
     """
 
+    _DEPENDENCIES = {"nilearn", "numpy"}
+
     def __init__(
         self,
         coords: str,
@@ -79,53 +78,27 @@ class SphereAggregation(BaseMarker):
         """
         return ["T1w", "BOLD", "VBM_GM", "VBM_WM", "fALFF", "GCOR", "LCOR"]
 
-    def get_output_kind(self, input: List[str]) -> List[str]:
+    def get_output_type(self, input_type: str) -> str:
-        """Get output kind.
+        """Get output type.
 
         Parameters
         ----------
-        input : list of str
+        input_type : str
-            The kind of data to work on.
+            The data type input to the marker.
 
         Returns
         -------
-        list of str
+        str
-            The list of storage kinds.
+            The storage type output by the marker.
 
         """
-        outputs = []
-        for t_input in input:
-            if t_input in ["VBM_GM", "VBM_WM", "fALFF", "GCOR", "LCOR"]:
-                outputs.append("table")
-            elif t_input in ["BOLD"]:
-                outputs.append("timeseries")
-            else:
-                raise ValueError(f"Unknown input kind for {t_input}")
-        return outputs
 
-    def store(
+        if input_type in ["VBM_GM", "VBM_WM", "fALFF", "GCOR", "LCOR"]:
-        self,
+            return "table"
-        kind: str,
+        elif input_type == "BOLD":
-        out: Dict[str, Any],
+            return "timeseries"
-        storage: "BaseFeatureStorage",
+        else:
-    ) -> None:
+            raise ValueError(f"Unknown input kind for {input_type}")
-        """Store.
-
-        Parameters
-        ----------
-        kind : {"BOLD", "VBM_GM", "VBM_WM", "fALFF", "GCOR", "LCOR"}
-            The data kind to store.
-        out : dict
-            The computed result as a dictionary to store.
-        storage : storage-like
-            The storage class, for example, SQLiteFeatureStorage.
-
-        """
-        logger.debug(f"Storing {kind} in {storage}")
-        if kind in ["VBM_GM", "VBM_WM", "fALFF", "GCOR", "LCOR"]:
-            storage.store(kind="table", **out)
-        elif kind in ["BOLD"]:
-            storage.store(kind="timeseries", **out)
 
     def compute(
         self,
@@ -180,6 +153,4 @@ class SphereAggregation(BaseMarker):
         out_values = masker.fit_transform(t_input)
         # Format the output
         out = {"data": out_values, "columns": out_labels}
-        if out_values.shape[0] > 1:
-            out["row_names"] = "scan"
         return out

junifer/markers/tests/test_crossparcellation_functional_connectivity.py

@@ -15,6 +15,7 @@ from junifer.markers.crossparcellation_functional_connectivity import (
 from junifer.storage import SQLiteFeatureStorage
 from junifer.testing.datagrabbers import SPMAuditoryTestingDatagrabber
 
+
 parcellation_ONE = "Schaefer100x17"
 parcellation_TWO = "Schaefer200x17"
 
@@ -30,8 +31,7 @@ def test_compute() -> None:
                 "data": niimg,
                 "path": out["BOLD"]["path"],
                 "meta": {"element": "sub001"},
-            },
+            }
-            "meta": {"element": "sub001"},
         }
 
         crossparcellation = CrossParcellationFC(
@@ -43,12 +43,6 @@ def test_compute() -> None:
         assert out["data"].shape == (200, 100)
         assert len(out["col_names"]) == 100
         assert len(out["row_names"]) == 200
-        meta = crossparcellation.get_meta("BOLD")["marker"]
-        assert meta["aggregation_method"] == "mean"
-        assert meta["class"] == "CrossParcellationFC"
-        assert meta["parcellation_one"] == "Schaefer100x17"
-        assert meta["parcellation_two"] == "Schaefer200x17"
-        assert meta["correlation_method"] == "spearman"
 
 
 def test_store(tmp_path: Path) -> None:
@@ -62,16 +56,10 @@ def test_store(tmp_path: Path) -> None:
     """
 
     with SPMAuditoryTestingDatagrabber() as dg:
-        out = dg["sub001"]
+        input_dict = dg["sub001"]
-        niimg = image.load_img(str(out["BOLD"]["path"].absolute()))
+        niimg = image.load_img(str(input_dict["BOLD"]["path"].absolute()))
-        input_dict = {
+
-            "BOLD": {
+        input_dict["BOLD"]["data"] = niimg
-                "data": niimg,
-                "path": out["BOLD"]["path"],
-                "meta": {"element": "sub001"},
-            },
-            "meta": {"element": "sub001"},
-        }
 
         crossparcellation = CrossParcellationFC(
             parcellation_one=parcellation_ONE,
@@ -80,19 +68,23 @@ def test_store(tmp_path: Path) -> None:
         )
         uri = tmp_path / "test_crossparcellation.sqlite"
         storage = SQLiteFeatureStorage(uri=uri, upsert="ignore")
-        out = crossparcellation.fit_transform(input_dict, storage=storage)
+        crossparcellation.fit_transform(input_dict, storage=storage)
+        features = storage.list_features()
+        assert any(
+            x["name"] == "BOLD_CrossParcellationFC"
+            for x in features.values()
+        )
 
 
-def test_get_output_kind() -> None:
+def test_get_output_type() -> None:
-    """Test CrossParcellationFC get_output_kind()."""
+    """Test CrossParcellationFC get_output_type()."""
 
     crossparcellation = CrossParcellationFC(
         parcellation_one=parcellation_ONE, parcellation_two=parcellation_TWO
     )
-    input_list = ["BOLD"]
+    input_ = "BOLD"
-    input_list = crossparcellation.get_output_kind(input_list)
+    output = crossparcellation.get_output_type(input_)
-    assert len(input_list) == 1
+    assert output == "matrix"
-    assert input_list[0] in ["matrix"]
 
 
 def test_init_() -> None:

junifer/markers/tests/test_ets_rss.py

@@ -16,6 +16,7 @@ from junifer.markers.ets_rss import RSSETSMarker
 from junifer.storage import SQLiteFeatureStorage
 from junifer.testing.datagrabbers import SPMAuditoryTestingDatagrabber
 
+
 # Set parcellation
 PARCELLATION = "Schaefer100x17"
 
@@ -42,21 +43,13 @@ def test_compute() -> None:
         n_time, _ = test_ts.shape
         assert n_time == len(new_out["data"])
 
-        # Assert the meta
-        meta = ets_rss_marker.get_meta("BOLD")["marker"]
-        assert meta["parcellation"] == "Schaefer100x17"
-        assert meta["agg_method"] == "mean"
-        assert meta["agg_method_params"] is None
-        assert meta["class"] == "RSSETSMarker"
 
-
+def test_get_output_type() -> None:
-def test_get_output_kind() -> None:
+    """Test RSS ETS get_output_type()."""
-    """Test RSS ETS get_output_kind()."""
     ets_rss_marker = RSSETSMarker(parcellation=PARCELLATION)
-    input_list = ["BOLD"]
+    input_ = "BOLD"
-    input_list = ets_rss_marker.get_output_kind(input_list)
+    output = ets_rss_marker.get_output_type(input_)
-    assert len(input_list) == 1
+    assert output == "timeseries"
-    assert input_list[0] in ["timeseries"]
 
 
 def test_store(tmp_path: Path) -> None:
@@ -70,14 +63,18 @@ def test_store(tmp_path: Path) -> None:
     """
     with SPMAuditoryTestingDatagrabber() as dg:
         # Fetch element
-        out = dg["sub001"]
+        elem = dg["sub001"]
         # Load BOLD image
-        niimg = image.load_img(str(out["BOLD"]["path"].absolute()))
+        niimg = image.load_img(str(elem["BOLD"]["path"].absolute()))
-        input_dict = {"data": niimg, "path": out["BOLD"]["path"]}
+        elem["BOLD"]["data"] = niimg
         # Compute the RSSETSMarker
         ets_rss_marker = RSSETSMarker(parcellation=PARCELLATION)
         # Create storage
         storage = SQLiteFeatureStorage(
-            uri=str((tmp_path / "test.sqlite").absolute()))
+            uri=str((tmp_path / "test.sqlite").absolute())
+        )
         # Store
-        ets_rss_marker.fit_transform(input=input_dict, storage=storage)
+        ets_rss_marker.fit_transform(input=elem, storage=storage)
+
+        features = storage.list_features()
+        assert any(x["name"] == "BOLD_RSSETSMarker" for x in features.values())

junifer/markers/tests/test_functional_connectivity_parcels.py

@@ -32,7 +32,7 @@ def test_FunctionalConnectivityParcels(tmp_path: Path) -> None:
     fmri_img = image.concat_imgs(ni_data.func)  # type: ignore
 
     fc = FunctionalConnectivityParcels(parcellation="Schaefer100x7")
-    all_out = fc.fit_transform({"BOLD": {"data": fmri_img}})
+    all_out = fc.fit_transform({"BOLD": {"data": fmri_img, "meta": {}}})
 
     out = all_out["BOLD"]
 
@@ -48,7 +48,11 @@ def test_FunctionalConnectivityParcels(tmp_path: Path) -> None:
     pa = ParcelAggregation(
         parcellation="Schaefer100x7", method="mean", on="BOLD"
     )
-    ts = pa.compute({"data": fmri_img})
+    meta = {
+        "element": {"subject": "sub001"},
+        "dependencies": {"nilearn"},
+    }
+    ts = pa.compute({"data": fmri_img, "meta": meta})
 
     # compare with nilearn
     # Get the testing parcellation (for nilearn)
@@ -69,22 +73,24 @@ def test_FunctionalConnectivityParcels(tmp_path: Path) -> None:
     assert_array_almost_equal(out_ni, out["data"], decimal=3)
 
     # check correct output
-    assert fc.get_output_kind(["BOLD"]) == ["matrix"]
+    assert fc.get_output_type("BOLD") == "matrix"
 
     # Check empirical correlation method parameters
     fc = FunctionalConnectivityParcels(
         parcellation="Schaefer100x7", cor_method_params={"empirical": True}
     )
 
-    all_out = fc.fit_transform({"BOLD": {"data": fmri_img}})
+    all_out = fc.fit_transform({"BOLD": {"data": fmri_img, "meta": meta}})
 
     uri = tmp_path / "test_fc_parcellation.sqlite"
     # Single storage, must be the uri
     storage = SQLiteFeatureStorage(uri=uri, upsert="ignore")
-    meta = {
+    meta = {"element": {"subject": "test"}, "dependencies": {"numpy"}}
-        "element": "test",
+    input = {"BOLD": {"data": fmri_img, "meta": meta}}
-        "version": "0.0.1",
-        "marker": {"name": "fcname"},
-    }
-    input = {"BOLD": {"data": fmri_img}, "meta": meta}
     all_out = fc.fit_transform(input, storage=storage)
+
+    features = storage.list_features()
+    assert any(
+        x["name"] == "BOLD_FunctionalConnectivityParcels"
+        for x in features.values()
+    )

junifer/markers/tests/test_functional_connectivity_spheres.py

@@ -36,7 +36,7 @@ def test_FunctionalConnectivitySpheres(tmp_path: Path) -> None:
     fc = FunctionalConnectivitySpheres(
         coords="DMNBuckner", radius=5.0, cor_method="correlation"
     )
-    all_out = fc.fit_transform({"BOLD": {"data": fmri_img}})
+    all_out = fc.fit_transform({"BOLD": {"data": fmri_img, "meta": {}}})
 
     out = all_out["BOLD"]
 
@@ -52,7 +52,7 @@ def test_FunctionalConnectivitySpheres(tmp_path: Path) -> None:
     sa = SphereAggregation(
         coords="DMNBuckner", radius=5.0, method="mean", on="BOLD"
     )
-    ts = sa.compute({"data": fmri_img})
+    ts = sa.compute({"data": fmri_img, "meta": {}})
 
     # Check that FC are almost equal when using nileran
     cm = ConnectivityMeasure(kind="correlation")
@@ -60,19 +60,24 @@ def test_FunctionalConnectivitySpheres(tmp_path: Path) -> None:
     assert_array_almost_equal(out_ni, out["data"], decimal=3)
 
     # check correct output
-    assert fc.get_output_kind(["BOLD"]) == ["matrix"]
+    assert fc.get_output_type("BOLD") == "matrix"
 
     uri = tmp_path / "test_fc_parcel.sqlite"
     # Single storage, must be the uri
     storage = SQLiteFeatureStorage(uri=uri, upsert="ignore")
     meta = {
-        "element": "test",
+        "element": {"subject": "test"},
-        "version": "0.0.1",
+        "dependencies": {"numpy", "nilearn"},
-        "marker": {"name": "fcname"},
     }
-    input = {"BOLD": {"data": fmri_img}, "meta": meta}
+    input = {"BOLD": {"data": fmri_img, "meta": meta}}
     all_out = fc.fit_transform(input, storage=storage)
 
+    features = storage.list_features()
+    assert any(
+        x["name"] == "BOLD_FunctionalConnectivitySpheres"
+        for x in features.values()
+    )
+
 
 def test_FunctionalConnectivitySpheres_empirical(tmp_path: Path) -> None:
     """Test FunctionalConnectivitySpheres with empirical covariance.
@@ -94,7 +99,7 @@ def test_FunctionalConnectivitySpheres_empirical(tmp_path: Path) -> None:
         cor_method="correlation",
         cor_method_params={"empirical": True},
     )
-    all_out = fc.fit_transform({"BOLD": {"data": fmri_img}})
+    all_out = fc.fit_transform({"BOLD": {"data": fmri_img, "meta": {}}})
 
     out = all_out["BOLD"]
 

junifer/markers/tests/test_markers_base.py

@@ -19,10 +19,14 @@ def test_base_marker_subclassing() -> None:
     """Test proper subclassing of BaseMarker."""
     # Create concrete class
     class MyBaseMarker(BaseMarker):
+        def __init__(self, on, name=None) -> None:
+            self.parameter = 1
+            super().__init__(on, name)
+
         def get_valid_inputs(self):
             return ["BOLD", "T1w"]
 
-        def get_output_kind(self, input):
+        def get_output_type(self, input):
             return ["timeseries"]
 
         def compute(self, input, extra_input):
@@ -32,18 +36,19 @@ def test_base_marker_subclassing() -> None:
                 "row_names": "row_names",
             }
 
-        def store(self, kind, out, storage):
-            return super().store(kind=kind, out=out, storage=storage)
-
     with pytest.raises(ValueError, match=r"cannot be computed on \['T2w'\]"):
         MyBaseMarker(on=["BOLD", "T2w"])
 
     # Create input for marker
     input_ = {
-        "meta": {"datagrabber": "dg", "element": "elem", "datareader": "dr"},
         "BOLD": {
             "path": ".",
             "data": "data",
+            "meta": {
+                "datagrabber": "dg",
+                "element": "elem",
+                "datareader": "dr",
+            },
         },
     }
     marker = MyBaseMarker(on=["BOLD"])
@@ -57,14 +62,16 @@ def test_base_marker_subclassing() -> None:
     assert "data" in output["BOLD"]
     assert "columns" in output["BOLD"]
     assert "row_names" in output["BOLD"]
-    assert "meta" in output["BOLD"]
-    assert "datagrabber" in output["BOLD"]["meta"]
-    assert "element" in output["BOLD"]["meta"]
-    assert "datareader" in output["BOLD"]["meta"]
 
-    # Check no implementation check
+    assert "meta" in output["BOLD"]
-    with pytest.raises(NotImplementedError):
+    meta = output["BOLD"]["meta"]
-        marker.store(kind="kind", out="out", storage="storage")  # type: ignore
+    assert "datagrabber" in meta
+    assert "element" in meta
+    assert "datareader" in meta
+    assert "marker" in meta
+    assert "name" in meta["marker"]
+    assert "parameter" in meta["marker"]
+    assert meta["marker"]["parameter"] == 1
 
     # Check attributes
     assert marker.name == "MyBaseMarker"

junifer/markers/tests/test_parcel_aggregation.py

@@ -3,18 +3,21 @@
 # Authors: Federico Raimondo <f.raimondo@fz-juelich.de>
 #          Synchon Mandal <s.mandal@fz-juelich.de>
 # License: AGPL
+
+from pathlib import Path
+
 import nibabel as nib
 import numpy as np
 import pytest
-from pathlib import Path
 from nilearn import datasets
-from nilearn.image import concat_imgs, math_img, resample_to_img, new_img_like
+from nilearn.image import concat_imgs, math_img, new_img_like, resample_to_img
 from nilearn.maskers import NiftiLabelsMasker, NiftiMasker
 from numpy.testing import assert_array_almost_equal, assert_array_equal
 from scipy.stats import trim_mean
 
 from junifer.data import load_mask, load_parcellation, register_parcellation
 from junifer.markers.parcel_aggregation import ParcelAggregation
+from junifer.storage import SQLiteFeatureStorage
 
 
 def test_ParcelAggregation_input_output() -> None:
@@ -22,12 +25,11 @@ def test_ParcelAggregation_input_output() -> None:
     marker = ParcelAggregation(
         parcellation="Schaefer100x7", method="mean", on="VBM_GM"
     )
-
+    for in_, out_ in [("VBM_GM", "table"), ("BOLD", "timeseries")]:
-    output = marker.get_output_kind(["VBM_GM", "BOLD"])
+        assert marker.get_output_type(in_) == out_
-    assert output == ["table", "timeseries"]
 
     with pytest.raises(ValueError, match="Unknown input"):
-        marker.get_output_kind(["VBM_GM", "BOLD", "unknown"])
+        marker.get_output_type("unknown")
 
 
 def test_ParcelAggregation_3D() -> None:
@@ -78,22 +80,13 @@ def test_ParcelAggregation_3D() -> None:
         name="gmd_schaefer100x7_mean",
         on="VBM_GM",
     )  # Test passing "on" as a keyword argument
-    input = dict(VBM_GM=dict(data=img))
+    input = {"VBM_GM": {"data": img, "meta": {}}}
     jun_values3d_mean = marker.fit_transform(input)["VBM_GM"]["data"]
 
     assert jun_values3d_mean.ndim == 2
     assert jun_values3d_mean.shape[0] == 1
     assert_array_equal(manual, jun_values3d_mean)
 
-    meta = marker.get_meta("VBM_GM")["marker"]
-    assert meta["method"] == "mean"
-    assert meta["parcellation"] == ["Schaefer100x7"]
-    assert meta["mask"] is None
-    assert meta["name"] == "VBM_GM_gmd_schaefer100x7_mean"
-    assert meta["class"] == "ParcelAggregation"
-    assert meta["kind"] == "VBM_GM"
-    assert meta["method_params"] == {}
-
     # Test using another function (std)
     manual = []
     for t_v in sorted(np.unique(parcellation_values)):
@@ -103,22 +96,13 @@ def test_ParcelAggregation_3D() -> None:
 
     # Use the ParcelAggregation object
     marker = ParcelAggregation(parcellation="Schaefer100x7", method="std")
-    input = dict(VBM_GM=dict(data=img))
+    input = {"VBM_GM": {"data": img, "meta": {}}}
     jun_values3d_std = marker.fit_transform(input)["VBM_GM"]["data"]
 
     assert jun_values3d_std.ndim == 2
     assert jun_values3d_std.shape[0] == 1
     assert_array_equal(manual, jun_values3d_std)
 
-    meta = marker.get_meta("VBM_GM")["marker"]
-    assert meta["method"] == "std"
-    assert meta["parcellation"] == ["Schaefer100x7"]
-    assert meta["mask"] is None
-    assert meta["name"] == "VBM_GM_ParcelAggregation"
-    assert meta["class"] == "ParcelAggregation"
-    assert meta["kind"] == "VBM_GM"
-    assert meta["method_params"] == {}
-
     # Test using another function with parameters
     manual = []
     for t_v in sorted(np.unique(parcellation_values)):
@@ -136,22 +120,13 @@ def test_ParcelAggregation_3D() -> None:
         method="trim_mean",
         method_params={"proportiontocut": 0.1},
     )
-    input = dict(VBM_GM=dict(data=img))
+    input = {"VBM_GM": {"data": img, "meta": {}}}
     jun_values3d_tm = marker.fit_transform(input)["VBM_GM"]["data"]
 
     assert jun_values3d_tm.ndim == 2
     assert jun_values3d_tm.shape[0] == 1
     assert_array_equal(manual, jun_values3d_tm)
 
-    meta = marker.get_meta("VBM_GM")["marker"]
-    assert meta["method"] == "trim_mean"
-    assert meta["parcellation"] == ["Schaefer100x7"]
-    assert meta["mask"] is None
-    assert meta["name"] == "VBM_GM_ParcelAggregation"
-    assert meta["class"] == "ParcelAggregation"
-    assert meta["kind"] == "VBM_GM"
-    assert meta["method_params"] == {"proportiontocut": 0.1}
-
 
 def test_ParcelAggregation_4D():
     """Test ParcelAggregation object on 4D images."""
@@ -170,21 +145,63 @@ def test_ParcelAggregation_4D():
 
     # Create ParcelAggregation object
     marker = ParcelAggregation(parcellation="Schaefer100x7", method="mean")
-    input = dict(BOLD=dict(data=fmri_img))
+    input = {"BOLD": {"data": fmri_img, "meta": {}}}
     jun_values4d = marker.fit_transform(input)["BOLD"]["data"]
 
     assert jun_values4d.ndim == 2
     assert_array_equal(auto4d.shape, jun_values4d.shape)
     assert_array_equal(auto4d, jun_values4d)
 
-    meta = marker.get_meta("BOLD")["marker"]
+
-    assert meta["method"] == "mean"
+def test_ParcelAggregation_storage(tmp_path: Path) -> None:
-    assert meta["parcellation"] == ["Schaefer100x7"]
+    """Test ParcelAggregation storage.
-    assert meta["mask"] is None
+
-    assert meta["name"] == "BOLD_ParcelAggregation"
+    Parameters
-    assert meta["class"] == "ParcelAggregation"
+    ----------
-    assert meta["kind"] == "BOLD"
+    tmp_path : pathlib.Path
-    assert meta["method_params"] == {}
+        The path to the test directory.
+
+    """
+    # Get the oasis VBM data
+    oasis_dataset = datasets.fetch_oasis_vbm(n_subjects=1)
+    vbm = oasis_dataset.gray_matter_maps[0]
+    img = nib.load(vbm)
+    uri = tmp_path / "test_sphere_storage_3D.sqlite"
+
+    storage = SQLiteFeatureStorage(uri=uri, upsert="ignore")
+    meta = {
+        "element": {"subject": "sub-01", "session": "ses-01"},
+        "dependencies": {"nilearn", "nibabel"},
+    }
+    input = {"VBM_GM": {"data": img, "meta": meta}}
+    marker = ParcelAggregation(
+        parcellation="Schaefer100x7", method="mean", on="VBM_GM"
+    )
+
+    marker.fit_transform(input, storage=storage)
+
+    features = storage.list_features()
+    assert any(
+        x["name"] == "VBM_GM_ParcelAggregation" for x in features.values()
+    )
+
+    meta = {
+        "element": {"subject": "sub-01", "session": "ses-01"},
+        "dependencies": {"nilearn", "nibabel"},
+    }
+    # Get the SPM auditory data
+    subject_data = datasets.fetch_spm_auditory()
+    fmri_img = concat_imgs(subject_data.func)  # type: ignore
+    input = {"BOLD": {"data": fmri_img, "meta": meta}}
+    marker = ParcelAggregation(
+        parcellation="Schaefer100x7", method="mean", on="BOLD"
+    )
+
+    marker.fit_transform(input, storage=storage)
+    features = storage.list_features()
+    assert any(
+        x["name"] == "BOLD_ParcelAggregation" for x in features.values()
+    )
 
 
 def test_ParcelAggregation_3D_mask() -> None:
@@ -215,22 +232,13 @@ def test_ParcelAggregation_3D_mask() -> None:
         name="gmd_schaefer100x7_mean",
         on="VBM_GM",
     )  # Test passing "on" as a keyword argument
-    input = dict(VBM_GM=dict(data=img))
+    input = {"VBM_GM": {"data": img, "meta": {}}}
     jun_values3d_mean = marker.fit_transform(input)["VBM_GM"]["data"]
 
     assert jun_values3d_mean.ndim == 2
     assert jun_values3d_mean.shape[0] == 1
     assert_array_almost_equal(auto, jun_values3d_mean)
 
-    meta = marker.get_meta("VBM_GM")["marker"]
-    assert meta["method"] == "mean"
-    assert meta["parcellation"] == ["Schaefer100x7"]
-    assert meta["mask"] == "GM_prob0.2"
-    assert meta["name"] == "VBM_GM_gmd_schaefer100x7_mean"
-    assert meta["class"] == "ParcelAggregation"
-    assert meta["kind"] == "VBM_GM"
-    assert meta["method_params"] == {}
-
 
 def test_ParcelAggregation_3D_multiple_non_overlapping(tmp_path: Path) -> None:
     """Test ParcelAggregation with multiple non-overlapping parcellations.
@@ -281,7 +289,7 @@ def test_ParcelAggregation_3D_multiple_non_overlapping(tmp_path: Path) -> None:
         name="gmd_schaefer100x7_mean",
         on="VBM_GM",
     )  # Test passing "on" as a keyword argument
-    input = dict(VBM_GM=dict(data=img))
+    input = {"VBM_GM": {"data": img, "meta": {}}}
     orig_mean = marker_original.fit_transform(input)["VBM_GM"]
 
     orig_mean_data = orig_mean["data"]
@@ -290,15 +298,6 @@ def test_ParcelAggregation_3D_multiple_non_overlapping(tmp_path: Path) -> None:
     assert orig_mean_data.shape[1] == 100
     # assert_array_almost_equal(auto, jun_values3d_mean)
 
-    meta = marker_original.get_meta("VBM_GM")["marker"]
-    assert meta["method"] == "mean"
-    assert meta["parcellation"] == ["Schaefer100x7"]
-    assert meta["mask"] is None
-    assert meta["name"] == "VBM_GM_gmd_schaefer100x7_mean"
-    assert meta["class"] == "ParcelAggregation"
-    assert meta["kind"] == "VBM_GM"
-    assert meta["method_params"] == {}
-
     # Use the ParcelAggregation object on the two parcellations
     marker_split = ParcelAggregation(
         parcellation=["Schaefer100x7_low", "Schaefer100x7_high"],
@@ -306,7 +305,7 @@ def test_ParcelAggregation_3D_multiple_non_overlapping(tmp_path: Path) -> None:
         name="gmd_schaefer100x7_mean",
         on="VBM_GM",
     )  # Test passing "on" as a keyword argument
-    input = dict(VBM_GM=dict(data=img))
+    input = {"VBM_GM": {"data": img, "meta": {}}}
     split_mean = marker_split.fit_transform(input)["VBM_GM"]
     split_mean_data = split_mean["data"]
 
@@ -314,15 +313,6 @@ def test_ParcelAggregation_3D_multiple_non_overlapping(tmp_path: Path) -> None:
     assert split_mean_data.shape[0] == 1
     assert split_mean_data.shape[1] == 100
 
-    meta = marker_split.get_meta("VBM_GM")["marker"]
-    assert meta["method"] == "mean"
-    assert meta["parcellation"] == ["Schaefer100x7_low", "Schaefer100x7_high"]
-    assert meta["mask"] is None
-    assert meta["name"] == "VBM_GM_gmd_schaefer100x7_mean"
-    assert meta["class"] == "ParcelAggregation"
-    assert meta["kind"] == "VBM_GM"
-    assert meta["method_params"] == {}
-
     # Data and labels should be the same
     assert_array_equal(orig_mean_data, split_mean_data)
     assert orig_mean["columns"] == split_mean["columns"]
@@ -379,7 +369,7 @@ def test_ParcelAggregation_3D_multiple_overlapping(tmp_path: Path) -> None:
         name="gmd_schaefer100x7_mean",
         on="VBM_GM",
     )  # Test passing "on" as a keyword argument
-    input = dict(VBM_GM=dict(data=img))
+    input = {"VBM_GM": {"data": img, "meta": {}}}
     orig_mean = marker_original.fit_transform(input)["VBM_GM"]
 
     orig_mean_data = orig_mean["data"]
@@ -388,15 +378,6 @@ def test_ParcelAggregation_3D_multiple_overlapping(tmp_path: Path) -> None:
     assert orig_mean_data.shape[1] == 100
     # assert_array_almost_equal(auto, jun_values3d_mean)
 
-    meta = marker_original.get_meta("VBM_GM")["marker"]
-    assert meta["method"] == "mean"
-    assert meta["parcellation"] == ["Schaefer100x7"]
-    assert meta["mask"] is None
-    assert meta["name"] == "VBM_GM_gmd_schaefer100x7_mean"
-    assert meta["class"] == "ParcelAggregation"
-    assert meta["kind"] == "VBM_GM"
-    assert meta["method_params"] == {}
-
     # Use the ParcelAggregation object on the two parcellations
     marker_split = ParcelAggregation(
         parcellation=["Schaefer100x7_low2", "Schaefer100x7_high2"],
@@ -404,7 +385,7 @@ def test_ParcelAggregation_3D_multiple_overlapping(tmp_path: Path) -> None:
         name="gmd_schaefer100x7_mean",
         on="VBM_GM",
     )  # Test passing "on" as a keyword argument
-    input = dict(VBM_GM=dict(data=img))
+    input = {"VBM_GM": {"data": img, "meta": {}}}
     split_mean = marker_split.fit_transform(input)["VBM_GM"]
     split_mean_data = split_mean["data"]
 
@@ -412,18 +393,6 @@ def test_ParcelAggregation_3D_multiple_overlapping(tmp_path: Path) -> None:
     assert split_mean_data.shape[0] == 1
     assert split_mean_data.shape[1] == 100
 
-    meta = marker_split.get_meta("VBM_GM")["marker"]
-    assert meta["method"] == "mean"
-    assert meta["parcellation"] == [
-        "Schaefer100x7_low2",
-        "Schaefer100x7_high2",
-    ]
-    assert meta["mask"] is None
-    assert meta["name"] == "VBM_GM_gmd_schaefer100x7_mean"
-    assert meta["class"] == "ParcelAggregation"
-    assert meta["kind"] == "VBM_GM"
-    assert meta["method_params"] == {}
-
     # Data should be the same
     assert_array_equal(orig_mean_data, split_mean_data)
 

junifer/markers/tests/test_sphere_aggregation.py

@@ -3,6 +3,8 @@
 # Authors: Federico Raimondo <f.raimondo@fz-juelich.de>
 # License: AGPL
 
+import typing
+from typing import Dict
 from pathlib import Path
 
 import nibabel as nib
@@ -16,6 +18,7 @@ from junifer.data import load_coordinates, load_mask
 from junifer.markers.sphere_aggregation import SphereAggregation
 from junifer.storage import SQLiteFeatureStorage
 
+
 # Define common variables
 COORDS = "DMNBuckner"
 RADIUS = 8
@@ -23,15 +26,12 @@ RADIUS = 8
 
 def test_SphereAggregation_input_output() -> None:
     """Test SphereAggregation input and output types."""
-    marker = SphereAggregation(
+    marker = SphereAggregation(coords="DMNBuckner", method="mean", on="VBM_GM")
-        coords=COORDS, method="mean", radius=RADIUS, on="VBM_GM"
+    for in_, out_ in [("VBM_GM", "table"), ("BOLD", "timeseries")]:
-    )
+        assert marker.get_output_type(in_) == out_
-
-    output = marker.get_output_kind(["VBM_GM", "BOLD"])
-    assert output == ["table", "timeseries"]
 
     with pytest.raises(ValueError, match="Unknown input"):
-        marker.get_output_kind(["VBM_GM", "BOLD", "unknown"])
+        marker.get_output_type("unknown")
 
 
 def test_SphereAggregation_3D() -> None:
@@ -52,23 +52,13 @@ def test_SphereAggregation_3D() -> None:
     marker = SphereAggregation(
         coords=COORDS, method="mean", radius=RADIUS, on="VBM_GM"
     )
-    input = {"VBM_GM": {"data": img}}
+    input = {"VBM_GM": {"data": img, "meta": {}}}
     jun_values4d = marker.fit_transform(input)["VBM_GM"]["data"]
 
     assert jun_values4d.ndim == 2
     assert_array_equal(auto4d.shape, jun_values4d.shape)
     assert_array_equal(auto4d, jun_values4d)
 
-    meta = marker.get_meta("VBM_GM")["marker"]
-    assert meta["method"] == "mean"
-    assert meta["coords"] == COORDS
-    assert meta["radius"] == RADIUS
-    assert meta["mask"] is None
-    assert meta["name"] == "VBM_GM_SphereAggregation"
-    assert meta["class"] == "SphereAggregation"
-    assert meta["kind"] == "VBM_GM"
-    assert meta["method_params"] == {}
-
 
 def test_SphereAggregation_4D() -> None:
     """Test SphereAggregation object on 4D images."""
@@ -84,26 +74,14 @@ def test_SphereAggregation_4D() -> None:
     auto4d = nifti_masker.fit_transform(fmri_img)
 
     # Create SphereAggregation object
-    marker = SphereAggregation(
+    marker = SphereAggregation(coords=COORDS, method="mean", radius=RADIUS)
-        coords=COORDS, method="mean", radius=RADIUS
+    input = {"BOLD": {"data": fmri_img, "meta": {}}}
-    )
-    input = {"BOLD": {"data": fmri_img}}
     jun_values4d = marker.fit_transform(input)["BOLD"]["data"]
 
     assert jun_values4d.ndim == 2
     assert_array_equal(auto4d.shape, jun_values4d.shape)
     assert_array_equal(auto4d, jun_values4d)
 
-    meta = marker.get_meta("BOLD")["marker"]
-    assert meta["method"] == "mean"
-    assert meta["coords"] == COORDS
-    assert meta["radius"] == RADIUS
-    assert meta["mask"] is None
-    assert meta["name"] == "BOLD_SphereAggregation"
-    assert meta["class"] == "SphereAggregation"
-    assert meta["kind"] == "BOLD"
-    assert meta["method_params"] == {}
-
 
 def test_SphereAggregation_storage(tmp_path: Path) -> None:
     """Test SphereAggregation storage.
@@ -122,31 +100,38 @@ def test_SphereAggregation_storage(tmp_path: Path) -> None:
 
     storage = SQLiteFeatureStorage(uri=uri, upsert="ignore")
     meta = {
-        "element": "test",
+        "element": {"subject": "sub-01", "session": "ses-01"},
-        "version": "0.0.1",
+        "dependencies": {"nilearn", "nibabel"},
-        "marker": {"name": "fcname"},
     }
-    input = {"VBM_GM": {"data": img}, "meta": meta}
+    input = {"VBM_GM": {"data": img, "meta": meta}}
     marker = SphereAggregation(
         coords=COORDS, method="mean", radius=RADIUS, on="VBM_GM"
     )
 
     marker.fit_transform(input, storage=storage)
 
+    features: Dict = typing.cast(Dict, storage.list_features())
+    assert any(
+        x["name"] == "VBM_GM_SphereAggregation" for x in features.values()
+    )
+
     meta = {
-        "element": "test",
+        "element": {"subject": "sub-01", "session": "ses-01"},
-        "version": "0.0.1",
+        "dependencies": {"nilearn", "nibabel"},
-        "marker": {"name": "BOLD_fcname"},
     }
     # Get the SPM auditory data
     subject_data = datasets.fetch_spm_auditory()
     fmri_img = concat_imgs(subject_data.func)  # type: ignore
-    input = {"BOLD": {"data": fmri_img}, "meta": meta}
+    input = {"BOLD": {"data": fmri_img, "meta": meta}}
     marker = SphereAggregation(
         coords=COORDS, method="mean", radius=RADIUS, on="BOLD"
     )
 
     marker.fit_transform(input, storage=storage)
+    features: Dict = typing.cast(Dict, storage.list_features())
+    assert any(
+        x["name"] == "BOLD_SphereAggregation" for x in features.values()
+    )
 
 
 def test_SphereAggregation_3D_mask() -> None:
@@ -164,26 +149,21 @@ def test_SphereAggregation_3D_mask() -> None:
 
     # Create NiftSpheresMasker
     nifti_masker = NiftiSpheresMasker(
-        seeds=coordinates, radius=RADIUS, mask_img=mask_img)
+        seeds=coordinates, radius=RADIUS, mask_img=mask_img
+    )
     auto4d = nifti_masker.fit_transform(img)
 
     # Create SphereAggregation object
     marker = SphereAggregation(
-        coords=COORDS, method="mean", radius=RADIUS, on="VBM_GM",
+        coords=COORDS,
-        mask="GM_prob0.2"
+        method="mean",
+        radius=RADIUS,
+        on="VBM_GM",
+        mask="GM_prob0.2",
     )
-    input = {"VBM_GM": {"data": img}}
+    input = {"VBM_GM": {"data": img, "meta": {}}}
     jun_values4d = marker.fit_transform(input)["VBM_GM"]["data"]
 
     assert jun_values4d.ndim == 2
     assert_array_equal(auto4d.shape, jun_values4d.shape)
     assert_array_equal(auto4d, jun_values4d)
-
-    meta = marker.get_meta("VBM_GM")["marker"]
-    assert meta["method"] == "mean"
-    assert meta["coords"] == COORDS
-    assert meta["radius"] == RADIUS
-    assert meta["name"] == "VBM_GM_SphereAggregation"
-    assert meta["class"] == "SphereAggregation"
-    assert meta["kind"] == "VBM_GM"
-    assert meta["method_params"] == {}

junifer/pipeline/__init__.py

@@ -5,3 +5,4 @@
 
 from . import registry
 from .pipeline_step_mixin import PipelineStepMixin
+from .update_meta_mixin import UpdateMetaMixin

junifer/pipeline/pipeline_step_mixin.py

@@ -4,6 +4,7 @@
 #          Synchon Mandal <s.mandal@fz-juelich.de>
 # License: AGPL
 
+from importlib.util import find_spec
 from typing import Dict, List
 
 from ..utils import raise_error
@@ -12,22 +13,6 @@ from ..utils import raise_error
 class PipelineStepMixin:
     """Mixin class for pipeline."""
 
-    def get_meta(self) -> Dict:
-        """Get metadata.
-
-        Returns
-        -------
-        dict
-            The metadata as a dictionary.
-
-        """
-        t_meta = {}
-        t_meta["class"] = self.__class__.__name__
-        for k, v in vars(self).items():
-            if not k.startswith("_"):
-                t_meta[k] = v
-        return t_meta
-
     def validate_input(self, input: List[str]) -> None:
         """Validate the input to the pipeline step.
 
@@ -48,24 +33,22 @@ class PipelineStepMixin:
             klass=NotImplementedError,
         )
 
-    def get_output_kind(self, input: List[str]) -> List[str]:
+    def get_output_type(self, input_type: str) -> str:
-        """Get the kind of the pipeline step.
+        """Get output type.
 
         Parameters
         ----------
-        input : list of str
+        input_type : str
-            The input to the pipeline step. The list must contain the
+            The data type input to the marker.
-            available Junifer Data dictionary keys.
 
         Returns
         -------
-        list of str
+        str
-            The updated list of available Junifer Data dictionary keys after
+            The storage type output by the marker.
-            the pipeline step.
 
         """
         raise_error(
-            msg="Concrete classes need to implement get_output_kind().",
+            msg="Concrete classes need to implement get_output_type().",
             klass=NotImplementedError,
         )
 
@@ -85,11 +68,30 @@ class PipelineStepMixin:
         Raises
         ------
         ValueError
-            If the input does not have the required data.
+            If the pipeline step object is missing dependencies required for
+            its working or if the input does not have the required data.
 
         """
+        # Check if _DEPENDENCIES attribute is found;
+        # (markers and preprocessors will have them but not datareaders
+        # as of now)
+        dependencies_not_found = []
+        if hasattr(self, "_DEPENDENCIES"):
+            # Check if dependencies are importable
+            for dependency in self._DEPENDENCIES:  # type: ignore
+                if find_spec(dependency) is None:
+                    dependencies_not_found.append(dependency)
+        # Raise error if any dependency is not found
+        if dependencies_not_found:
+            raise_error(
+                msg=f"{dependencies_not_found} are not installed but are "
+                "required for using {self.name}.",
+                klass=ImportError,
+            )
+
         self.validate_input(input=input)
-        return self.get_output_kind(input=input)
+        outputs = [self.get_output_type(t_input) for t_input in input]
+        return outputs
 
     def fit_transform(self, input: Dict[str, Dict]) -> Dict[str, Dict]:
         """Fit and transform.

junifer/pipeline/registry.py

@@ -9,6 +9,7 @@ from typing import TYPE_CHECKING, Dict, List, Optional, Union
 
 from ..utils.logging import logger, raise_error
 
+
 if TYPE_CHECKING:
     from ..datagrabber import BaseDataGrabber
     from ..storage import BaseFeatureStorage

junifer/pipeline/tests/test_pipeline_step_mixin.py

@@ -4,6 +4,8 @@
 #          Synchon Mandal <s.mandal@fz-juelich.de>
 # License: AGPL
 
+from typing import Dict, List
+
 import pytest
 
 from junifer.pipeline.pipeline_step_mixin import PipelineStepMixin
@@ -15,13 +17,49 @@ def test_PipelineStepMixin() -> None:
     with pytest.raises(NotImplementedError):
         mixin.validate_input([])
     with pytest.raises(NotImplementedError):
-        mixin.get_output_kind([])
+        mixin.get_output_type("")
     with pytest.raises(NotImplementedError):
         mixin.fit_transform({})
 
 
-def test_pipeline_step_mixin_meta():
+def test_pipeline_step_mixin_validate_correct_dependencies() -> None:
-    """Test metadata for PipelineStepMixin."""
+    """Test validate with correct dependencies."""
-    pipemixin = PipelineStepMixin()
+
-    t_meta = pipemixin.get_meta()
+    class CorrectMixer(PipelineStepMixin):
-    assert t_meta["class"] == "PipelineStepMixin"
+        """Test class for validation."""
+
+        _DEPENDENCIES = {"setuptools"}
+
+        def validate_input(self, input: List[str]) -> None:
+            print(input)
+
+        def get_output_type(self, input_type: str) -> str:
+            return input_type
+
+        def fit_transform(self, input: Dict[str, Dict]) -> Dict[str, Dict]:
+            return {"input": input}
+
+    mixer = CorrectMixer()
+    mixer.validate([])
+
+
+def test_pipeline_step_mixin_validate_incorrect_dependencies() -> None:
+    """Test validate with incorrect dependencies."""
+
+    class IncorrectMixer(PipelineStepMixin):
+        """Test class for validation."""
+
+        _DEPENDENCIES = {"foobar"}
+
+        def validate_input(self, input: List[str]) -> None:
+            print(input)
+
+        def get_output_type(self, input_type: str) -> str:
+            return input_type
+
+        def fit_transform(self, input: Dict[str, Dict]) -> Dict[str, Dict]:
+            return {"input": input}
+
+    mixer = IncorrectMixer()
+    with pytest.raises(ImportError, match="not installed"):
+        mixer.validate([])

junifer/pipeline/tests/test_update_meta_mixin.py

@@ -0,0 +1,51 @@
+"""Provide tests for update meta mixin."""
+
+# Authors: Federico Raimondo <f.raimondo@fz-juelich.de>
+#          Synchon Mandal <s.mandal@fz-juelich.de>
+# License: AGPL
+
+from typing import Dict, List, Set, Union
+
+import pytest
+
+from junifer.pipeline.update_meta_mixin import UpdateMetaMixin
+
+
+@pytest.mark.parametrize(
+    "input, step_name, dependencies, expected",
+    [
+        ({}, "step_name", None, set()),
+        ({}, "step_name", ["numpy"], set(["numpy"])),
+        ({}, "step_name", "numpy", set(["numpy"])),
+        ({}, "step_name", set(["numpy"]), set(["numpy"])),
+    ],
+)
+def test_UpdateMetaMixin(
+    input: Dict,
+    step_name: str,
+    dependencies: Union[Set, List, str, None],
+    expected: Set,
+) -> None:
+    """Test UpdateMetaMixin.
+
+    Parameters
+    ----------
+    input : dict
+        The data object to update.
+    step_name : str
+        The name of the pipeline step.
+    dependencies : set, list, None, str
+        The dependencies of the pipeline step.
+    expected : set
+        The expected dependencies.
+    """
+
+    class TestUpdateMetaMixin(UpdateMetaMixin):
+        """Test UpdateMetaMixin."""
+
+        _DEPENDENCIES = dependencies
+
+    obj = TestUpdateMetaMixin()
+    obj.update_meta(input, step_name=step_name)
+    assert input["meta"]["step_name"]["class"] == "TestUpdateMetaMixin"
+    assert input["meta"]["dependencies"] == expected

junifer/pipeline/update_meta_mixin.py

@@ -0,0 +1,43 @@
+"""Provide mixin class for updating metadata."""
+
+# Authors: Federico Raimondo <f.raimondo@fz-juelich.de>
+#          Synchon Mandal <s.mandal@fz-juelich.de>
+# License: AGPL
+
+from typing import Dict
+
+
+class UpdateMetaMixin:
+    """Mixin class for updating meta."""
+
+    def update_meta(
+        self,
+        input: Dict,
+        step_name: str,
+    ) -> None:
+        """Update metadata.
+
+        Parameters
+        ----------
+        input : dict
+            The data object to update.
+        step_name : str
+            The name of the pipeline step.
+        """
+        t_meta = {}
+        t_meta["class"] = self.__class__.__name__
+        for k, v in vars(self).items():
+            if not k.startswith("_"):
+                t_meta[k] = v
+
+        if "meta" not in input:
+            input["meta"] = {}
+        input["meta"][step_name] = t_meta
+        if "dependencies" not in input["meta"]:
+            input["meta"]["dependencies"] = set()
+
+        dependencies = getattr(self, "_DEPENDENCIES", set())
+        if dependencies is not None:
+            if not isinstance(dependencies, (set, list)):
+                dependencies = set([dependencies])
+            input["meta"]["dependencies"].update(dependencies)

junifer/preprocess/base.py

@@ -7,11 +7,11 @@
 from abc import ABC, abstractmethod
 from typing import Any, Dict, List, Optional, Tuple, Union
 
-from ..pipeline import PipelineStepMixin
+from ..pipeline import PipelineStepMixin, UpdateMetaMixin
 from ..utils import logger, raise_error
 
 
-class BasePreprocessor(ABC, PipelineStepMixin):
+class BasePreprocessor(ABC, PipelineStepMixin, UpdateMetaMixin):
     """Provide abstract base class for all preprocessors.
 
     Parameters
@@ -58,8 +58,8 @@ class BasePreprocessor(ABC, PipelineStepMixin):
             )
 
     @abstractmethod
-    def get_output_kind(self, input: List[str]) -> List[str]:
+    def get_output_type(self, input: List[str]) -> List[str]:
-        """Get output kind.
+        """Get output type.
 
         Parameters
         ----------
@@ -75,7 +75,7 @@ class BasePreprocessor(ABC, PipelineStepMixin):
 
         """
         raise_error(
-            msg="Concrete classes need to implement get_output_kind().",
+            msg="Concrete classes need to implement get_output_type().",
             klass=NotImplementedError,
         )
 
@@ -93,22 +93,6 @@ class BasePreprocessor(ABC, PipelineStepMixin):
             klass=NotImplementedError,
         )
 
-    def get_meta(self, kind: str) -> Dict:
-        """Get metadata.
-
-        Parameters
-        ----------
-        kind : str
-            The kind of pipeline step.
-
-        Returns
-        -------
-        dict
-            The metadata as a dictionary with the only key 'preprocess'.
-        """
-        s_meta = super().get_meta()
-        return {"preprocess": s_meta}
-
     def fit_transform(
         self,
         input: Dict[str, Dict],
@@ -127,19 +111,17 @@ class BasePreprocessor(ABC, PipelineStepMixin):
 
         """
         out = input
-        for kind in self._on:
+        for type_ in self._on:
-            if kind in input.keys():
+            if type_ in input.keys():
-                logger.info(f"Computing {kind}")
+                logger.info(f"Computing {type_}")
-                t_input = input[kind]
+                t_input = input[type_]
                 extra_input = input.copy()
-                extra_input.pop(kind)
+                extra_input.pop(type_)
-                t_meta = t_input.get("meta", {})  # input kind meta
-                t_meta.update(self.get_meta(kind))
                 key, t_out = self.preprocess(
                     input=t_input, extra_input=extra_input
                 )
-                t_out.update(meta=t_meta)
                 out[key] = t_out
+                self.update_meta(out[key], "preprocess")
         return out
 
     @abstractmethod

junifer/preprocess/confounds/fmriprep_confound_remover.py

@@ -17,6 +17,7 @@ from ...api.decorators import register_preprocessor
 from ...utils import logger, raise_error
 from ..base import BasePreprocessor
 
+
 if TYPE_CHECKING:
     from nibabel import MGHImage, Nifti1Image, Nifti2Image
 
@@ -141,6 +142,8 @@ class fMRIPrepConfoundRemover(BasePreprocessor):
 
     """
 
+    _DEPENDENCIES = {"numpy", "nilearn"}
+
     def __init__(
         self,
         strategy: Optional[Dict[str, str]] = None,
@@ -222,7 +225,7 @@ class fMRIPrepConfoundRemover(BasePreprocessor):
                 klass=ValueError,
             )
 
-    def get_output_kind(self, input: List[str]) -> List[str]:
+    def get_output_type(self, input: List[str]) -> List[str]:
         """Get the kind of the pipeline step.
 
         Parameters

junifer/preprocess/confounds/tests/test_fmriprep_confound_remover.py

@@ -62,7 +62,7 @@ def test_fMRIPrepConfoundRemover_validate_input() -> None:
     confound_remover.validate_input(input)
 
 
-def test_fMRIPrepConfoundRemover_get_output_kind() -> None:
+def test_fMRIPrepConfoundRemover_get_output_type() -> None:
     """Test fMRIPrepConfoundRemover validate_input."""
     confound_remover = fMRIPrepConfoundRemover()
     inputs = [
@@ -72,7 +72,7 @@ def test_fMRIPrepConfoundRemover_get_output_kind() -> None:
     ]
     # Confound remover works in place
     for input in inputs:
-        assert confound_remover.get_output_kind(input) == input
+        assert confound_remover.get_output_type(input) == input
 
 
 def test_fMRIPrepConfoundRemover__map_adhoc_to_fmriprep() -> None:
@@ -460,8 +460,8 @@ def test_fMRIPrepConfoundRemover__remove_confounds() -> None:
         clean_bold = typing.cast(nib.Nifti1Image, clean_bold)
         # TODO: Find a better way to test functionality here
         assert (
-            clean_bold.header.get_zooms() ==  # type: ignore
+            clean_bold.header.get_zooms()  # type: ignore
-            raw_bold.header.get_zooms()
+            == raw_bold.header.get_zooms()  # type: ignore
         )
         assert clean_bold.get_fdata().shape == raw_bold.get_fdata().shape
     # TODO: Test confound remover with mask, needs #79 to be implemented
@@ -521,7 +521,6 @@ def test_fMRIPrepConfoundRemover_fit_transform() -> None:
             AssertionError, assert_array_equal, orig_bold, trans_bold
         )
 
-        assert output["meta"] == input["meta"]  # general meta does not change
         assert "meta" in output["BOLD"]
         assert "preprocess" in output["BOLD"]["meta"]
         t_meta = output["BOLD"]["meta"]["preprocess"]
@@ -535,3 +534,7 @@ def test_fMRIPrepConfoundRemover_fit_transform() -> None:
         assert t_meta["high_pass"] is None
         assert t_meta["t_r"] is None
         assert t_meta["mask_img"] is None
+
+        assert "dependencies" in output["BOLD"]["meta"]
+        dependencies = output["BOLD"]["meta"]["dependencies"]
+        assert dependencies == {"numpy", "nilearn"}

junifer/preprocess/tests/test_preprocess_base.py

@@ -19,10 +19,14 @@ def test_base_preprocessor_subclassing() -> None:
     """Test proper subclassing of BasePreprocessor."""
     # Create concrete class
     class MyBasePreprocessor(BasePreprocessor):
+        def __init__(self, on):
+            self.parameter = 1
+            super().__init__(on=on)
+
         def get_valid_inputs(self):
             return ["BOLD", "T1w"]
 
-        def get_output_kind(self, input):
+        def get_output_type(self, input):
             return ["timeseries"]
 
         def preprocess(self, input, extra_input):
@@ -37,14 +41,23 @@ def test_base_preprocessor_subclassing() -> None:
 
     # Create input for marker
     input_ = {
-        "meta": {"datagrabber": "dg", "element": "elem", "datareader": "dr"},
         "BOLD": {
             "path": ".",
             "data": "data",
+            "meta": {
+                "datagrabber": "dg",
+                "element": "elem",
+                "datareader": "dr",
+            },
         },
         "T1w": {
             "path": ".",
             "data": "data",
+            "meta": {
+                "datagrabber": "dg",
+                "element": "elem",
+                "datareader": "dr",
+            },
         },
     }
     prep = MyBasePreprocessor(on=["BOLD"])
@@ -60,6 +73,13 @@ def test_base_preprocessor_subclassing() -> None:
     assert "path" in output["BOLD"]
     assert "meta" in output["BOLD"]
 
+    meta = output["BOLD"]["meta"]
+    assert "preprocess" in meta
+    assert "class" in meta["preprocess"]
+    assert "MyBasePreprocessor" == meta["preprocess"]["class"]
+    assert "parameter" in meta["preprocess"]
+    assert 1 == meta["preprocess"]["parameter"]
+
     assert "T1w" in output
     assert "data" in output["T1w"]
     assert output["T1w"]["data"] == "data"

junifer/storage/base.py

@@ -6,12 +6,13 @@
 
 from abc import ABC, abstractmethod
 from pathlib import Path
-from typing import Dict, List, Optional, Union
+from typing import Dict, Iterable, List, Optional, Union
 
+import numpy as np
 import pandas as pd
 
-from .._version import __version__
 from ..utils import raise_error
+from .utils import process_meta
 
 
 class BaseFeatureStorage(ABC):
@@ -40,23 +41,29 @@ class BaseFeatureStorage(ABC):
         self.uri = uri
         if not isinstance(storage_types, list):
             storage_types = [storage_types]
+        if any(x not in self.get_valid_inputs() for x in storage_types):
+            wrong_storage_types = [
+                x for x in storage_types if x not in self.get_valid_inputs()
+            ]
+            raise ValueError(
+                f"{self.__class__.__name__} cannot store {wrong_storage_types}"
+            )
         self._valid_inputs = storage_types
         self.single_output = single_output
 
-    def get_meta(self) -> Dict:
+    def get_valid_inputs(self) -> List[str]:
-        """Get metadata.
+        """Get valid storage types for input.
 
         Returns
         -------
-        dict
+        list of str
-            The metadata as a dictionary.
+            The list of storage types that can be used as input for this "
-
+            "storage.
         """
-        meta = {}
+        raise_error(
-        meta["versions"] = {
+            msg="Concrete classes need to implement get_valid_inputs().",
-            "junifer": __version__,
+            klass=NotImplementedError,
-        }
+        )
-        return meta
 
     def validate(self, input_: List[str]) -> None:
         """Validate the input to the pipeline step.
@@ -80,23 +87,15 @@ class BaseFeatureStorage(ABC):
             )
 
     @abstractmethod
-    def list_features(
+    def list_features(self) -> Dict:
-        self, return_df: bool = False
-    ) -> Union[Dict[str, Dict], pd.DataFrame]:
         """List the features in the storage.
 
-        Parameters
-        ----------
-        return_df : bool, optional
-            If True, returns a pandas DataFrame. If False, returns a
-            dictionary (default False).
-
         Returns
         -------
-        dict or pandas.DataFrame
+        dict
-            List of features in the storage. If dictionary is returned, the
+            List of features in the storage. The keys are the feature names to
-            keys are the feature names to be used in read_features() and the
+            be used in read_features() and the values are the metadata of each
-            values are the metadata of each feature.
+            feature.
 
         """
         raise_error(
@@ -131,19 +130,17 @@ class BaseFeatureStorage(ABC):
         )
 
     @abstractmethod
-    def store_metadata(self, meta: Dict) -> str:
+    def store_metadata(self, meta_md5: str, element: Dict, meta: Dict) -> None:
         """Store metadata.
 
         Parameters
         ----------
+        meta_md5 : str
+            The metadata MD5 hash.
+        element : dict
+            The element as a dictionary.
         meta : dict
             The metadata as a dictionary.
-
-        Returns
-        -------
-        str
-            The metadata column.
-
         """
         raise_error(
             msg="Concrete classes need to implement store_metadata().",
@@ -166,65 +163,117 @@ class BaseFeatureStorage(ABC):
             If ``kind`` is invalid.
 
         """
+        # Do the check before calling the abstract methods, otherwise the
+        # meta might be stored even if the data is not stored.
+        if kind not in self._valid_inputs:
+            raise_error(
+                msg=f"I don't know how to store {kind}.",
+                klass=ValueError,
+            )
+        t_meta = kwargs.pop("meta")
+        meta_md5, t_meta, t_element = process_meta(t_meta)
+        self.store_metadata(meta_md5=meta_md5, element=t_element, meta=t_meta)
         if kind == "matrix":
-            self.store_matrix(**kwargs)
+            self.store_matrix(meta_md5=meta_md5, element=t_element, **kwargs)
         elif kind == "timeseries":
-            self.store_timeseries(**kwargs)
+            self.store_timeseries(
+                meta_md5=meta_md5, element=t_element, **kwargs
+            )
         elif kind == "table":
-            self.store_table(**kwargs)
+            self.store_table(meta_md5=meta_md5, element=t_element, **kwargs)
-        else:
-            raise ValueError(f"I don't know how to store {kind}")
 
-    def store_df(self, **kwargs) -> None:
+    def store_matrix(
-        """Store pandas DataFrame.
+        self,
-
+        meta_md5: str,
-        Parameters
+        element: Dict,
-        ----------
+        data: np.ndarray,
-        **kwargs : dict
+        col_names: Optional[Iterable[str]] = None,
-            The keyword arguments.
+        row_names: Optional[Iterable[str]] = None,
-
+        matrix_kind: Optional[str] = "full",
-        """
+        diagonal: bool = True,
-        raise_error(
+    ) -> None:
-            msg="Concrete classes need to implement store_df().",
-            klass=NotImplementedError,
-        )
-
-    def store_matrix(self, **kwargs) -> None:
         """Store matrix.
 
         Parameters
         ----------
-        **kwargs : dict
+        meta_md5 : str
-            The keyword arguments.
+            The metadata MD5 hash.
+        element : dict
+            The element as a dictionary.
+        data : numpy.ndarray
+            The matrix data to store.
+        col_names : list or tuple of str, optional
+            The column names (default None).
+        row_names : str, optional
+            The column name to use in case number of rows greater than 1.
+            If None and number of rows greater than 1, then the name will be
+            "index" (default None).
+        matrix_kind : str, optional
+            The kind of matrix:
 
+            * ``triu`` : store upper triangular only
+            * ``tril`` : store lower triangular
+            * ``full`` : full matrix
+
+            (default "full").
+        diagonal : bool, optional
+            Whether to store the diagonal. If `matrix_kind` is "full", setting
+            this to False will raise an error (default True).
         """
         raise_error(
             msg="Concrete classes need to implement store_matrix2d().",
             klass=NotImplementedError,
         )
 
-    def store_table(self, **kwargs) -> None:
+    def store_table(
+        self,
+        meta_md5: str,
+        element: Dict,
+        data: Union[np.ndarray, List],
+        columns: Optional[Iterable[str]] = None,
+        rows_col_name: Optional[str] = None,
+    ) -> None:
         """Store table.
 
         Parameters
         ----------
-        **kwargs : dict
+        meta_md5 : str
-            The keyword arguments.
+            The metadata MD5 hash.
-
+        element : dict
+            The element as a dictionary.
+        data : numpy.ndarray or list
+            The table data to store.
+        columns : list or tuple of str, optional
+            The columns (default None).
+        rows_col_name : str, optional
+            The column name to use in case number of rows greater than 1.
+            If None and number of rows greater than 1, then the name will be
+            "index" (default None).
         """
         raise_error(
             msg="Concrete classes need to implement store_table().",
             klass=NotImplementedError,
         )
 
-    def store_timeseries(self, **kwargs) -> None:
+    def store_timeseries(
-        """Store timeseries.
+        self,
+        meta_md5: str,
+        element: Dict,
+        data: np.ndarray,
+        columns: Optional[Iterable[str]] = None,
+    ) -> None:
+        """Implement timeseries storing.
 
         Parameters
         ----------
-        **kwargs : dict
+        meta_md5 : str
-            The keyword arguments.
+            The metadata MD5 hash.
-
+        element : dict
+            The element as a dictionary.
+        data : numpy.ndarray
+            The timeseries data to store.
+        columns : list or tuple of str, optional
+            The column labels (default None).
         """
         raise_error(
             msg="Concrete classes need to implement store_timeseries().",

junifer/storage/pandas_base.py

@@ -6,8 +6,9 @@
 
 import json
 from pathlib import Path
-from typing import Dict, Union
+from typing import Any, Dict, Iterable, List, Optional, Union
 
+import numpy as np
 import pandas as pd
 
 from .base import BaseFeatureStorage
@@ -39,6 +40,17 @@ class PandasBaseFeatureStorage(BaseFeatureStorage):
     ) -> None:
         super().__init__(uri=uri, single_output=single_output, **kwargs)
 
+    def get_valid_inputs(self) -> List[str]:
+        """Get valid storage types for input.
+
+        Returns
+        -------
+        list of str
+            The list of storage types that can be used as input for this "
+            "storage.
+        """
+        return ["matrix", "table", "timeseries"]
+
     def _meta_row(self, meta: Dict, meta_md5: str) -> pd.DataFrame:
         """Convert the metadata to a pandas DataFrame.
 
@@ -57,8 +69,166 @@ class PandasBaseFeatureStorage(BaseFeatureStorage):
         data_df = {}
         for k, v in meta.items():
             data_df[k] = json.dumps(v, sort_keys=True)
-        if "marker" in meta:
-            data_df["name"] = meta["marker"]["name"]
         df = pd.DataFrame(data_df, index=[meta_md5])
         df.index.name = "meta_md5"
         return df
+
+    @staticmethod
+    def element_to_index(
+        element: Dict, n_rows: int = 1, rows_col_name: Optional[str] = None
+    ) -> pd.MultiIndex:
+        """Convert the element metadata to index.
+
+        Parameters
+        ----------
+        element : dict
+            The element as a dictionary.
+        n_rows : int, optional
+            Number of rows to create (default 1).
+        rows_col_name: str, optional
+            The column name to use in case `n_rows` > 1. If None and
+            n_rows > 1, the name will be "idx" (default None).
+
+        Returns
+        -------
+        pandas.MultiIndex
+            The index of the dataframe to store.
+
+        Raises
+        ------
+        ValueError
+            If `meta` does not contain the key "element".
+
+        """
+        # Check rows_col_name
+        if rows_col_name is None:
+            rows_col_name = "idx"
+        elem_idx: Dict[Any, Any] = {
+            k: [v] * n_rows for k, v in element.items()
+        }
+        elem_idx[rows_col_name] = np.arange(n_rows)
+        # Create index
+        index = pd.MultiIndex.from_frame(
+            pd.DataFrame(elem_idx, index=range(n_rows))
+        )
+        return index
+
+    def store_df(
+        self, meta_md5: str, element: Dict, df: Union[pd.DataFrame, pd.Series]
+    ) -> None:
+        """Implement pandas DataFrame storing.
+
+        Parameters
+        ----------
+        df : pandas.DataFrame or pandas.Series
+            The pandas DataFrame or Series to store.
+        meta : dict
+            The metadata as a dictionary.
+
+        Raises
+        ------
+        ValueError
+            If the dataframe index has items that are not in the index
+            generated from the metadata.
+
+        """
+        raise NotImplementedError("Implement in subclass.")
+
+    def _store_2d(
+        self,
+        meta_md5: str,
+        element: Dict,
+        data: Union[np.ndarray, List],
+        columns: Optional[Iterable[str]] = None,
+        rows_col_name: Optional[str] = None,
+    ) -> None:
+        """Store 2D dataframe.
+
+        Parameters
+        ----------
+        meta_md5 : str
+            The metadata MD5 hash.
+        element : dict
+            The element as a dictionary.
+        data : numpy.ndarray or List
+            The data to store.
+        columns : list or tuple of str, optional
+            The columns (default None).
+        rows_col_name : str, optional
+            The column name to use in case number of rows greater than 1.
+            If None and number of rows greater than 1, then the name will be
+            "index" (default None).
+
+        """
+        n_rows = len(data)
+        # Convert element metadata to index
+        idx = self.element_to_index(
+            element=element, n_rows=n_rows, rows_col_name=rows_col_name
+        )
+        # Prepare new dataframe
+        data_df = pd.DataFrame(  # type: ignore
+            data, columns=columns, index=idx  # type: ignore
+        )
+        # Store dataframe
+        self.store_df(meta_md5=meta_md5, element=element, df=data_df)
+
+    def store_table(
+        self,
+        meta_md5: str,
+        element: Dict,
+        data: Union[np.ndarray, List],
+        columns: Optional[Iterable[str]] = None,
+        rows_col_name: Optional[str] = None,
+    ) -> None:
+        """Implement table storing.
+
+        Parameters
+        ----------
+        meta_md5 : str
+            The metadata MD5 hash.
+        element : dict
+            The element as a dictionary.
+        data : numpy.ndarray or List
+            The table data to store.
+        columns : list or tuple of str, optional
+            The columns (default None).
+        rows_col_name : str, optional
+            The column name to use in case number of rows greater than 1.
+            If None and number of rows greater than 1, then the name will be
+            "index" (default None).
+        """
+        self._store_2d(
+            meta_md5=meta_md5,
+            element=element,
+            data=data,
+            columns=columns,
+            rows_col_name=rows_col_name,
+        )
+
+    def store_timeseries(
+        self,
+        meta_md5: str,
+        element: Dict,
+        data: np.ndarray,
+        columns: Optional[Iterable[str]] = None,
+    ) -> None:
+        """Implement timeseries storing.
+
+        Parameters
+        ----------
+        meta_md5 : str
+            The metadata MD5 hash.
+        element : dict
+            The element as a dictionary.
+        data : numpy.ndarray
+            The timeseries data to store.
+        columns : list or tuple of str, optional
+            The column labels (default None).
+        """
+        self._store_2d(
+            meta_md5=meta_md5,
+            element=element,
+            data=data,
+            columns=columns,
+            rows_col_name="timepoint",
+        )

junifer/storage/sqlite.py

@@ -5,8 +5,9 @@
 # License: AGPL
 
 from pathlib import Path
-from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Union
+from typing import TYPE_CHECKING, Dict, List, Optional, Union
 
+import json
 import numpy as np
 import pandas as pd
 from pandas.core.base import NoNewAttributesMixin
@@ -17,7 +18,8 @@ from tqdm import tqdm
 from ..api.decorators import register_storage
 from ..utils import logger, raise_error, warn_with_log
 from .pandas_base import PandasBaseFeatureStorage
-from .utils import element_to_index, element_to_prefix, process_meta
+from .utils import element_to_prefix
+
 
 if TYPE_CHECKING:
     from sqlalchemy.engine import Engine
@@ -86,7 +88,7 @@ class SQLiteFeatureStorage(PandasBaseFeatureStorage):
         # Set upsert
         self._upsert = upsert
 
-    def get_engine(self, meta: Optional[Dict] = None) -> "Engine":
+    def get_engine(self, element: Optional[Dict] = None) -> "Engine":
         """Get engine.
 
         Parameters
@@ -100,11 +102,6 @@ class SQLiteFeatureStorage(PandasBaseFeatureStorage):
             The sqlalchemy engine.
 
         """
-        # Set metadata as empty dictionary if None
-        if meta is None:
-            meta = {}
-        # Retrieve element key from metadata
-        element = meta.get("element", None)
         # Prefixed elements
         prefix = ""
         if self.single_output is False:
@@ -208,58 +205,15 @@ class SQLiteFeatureStorage(PandasBaseFeatureStorage):
                         msg=f"Invalid option {if_exists} for if_exists."
                     )
 
-    def _store_2d(
+    def list_features(self) -> Dict:
-        self,
+        """List the features in the storage.
-        data: Dict,
-        meta: Dict,
-        columns: Optional[Iterable[str]] = None,
-        rows_col_name: Optional[str] = None,
-    ) -> None:
-        """Store 2D dataframe.
-
-        Parameters
-        ----------
-        data : dict
-            The data to store.
-        meta : dict
-            The metadata as a dictionary.
-        columns : list or tuple of str, optional
-            The columns (default None).
-        rows_col_name : str, optional
-            The column name to use in case number of rows greater than 1.
-            If None and number of rows greater than 1, then the name will be
-            "index" (default None).
-
-        """
-        n_rows = len(data)
-        # Convert element metadata to index
-        idx = element_to_index(
-            meta=meta, n_rows=n_rows, rows_col_name=rows_col_name
-        )
-        # Prepare new dataframe
-        data_df = pd.DataFrame(  # type: ignore
-            data, columns=columns, index=idx  # type: ignore
-        )
-        # Store dataframe
-        self.store_df(df=data_df, meta=meta)
-
-    def list_features(
-        self, return_df: bool = False
-    ) -> Union[Dict, pd.DataFrame]:
-        """Implement features listing from the storage.
-
-        Parameters
-        ----------
-        return_df : bool, optional
-            If True, returns a pandas DataFrame. If False, returns a
-            dictionary (default False).
 
         Returns
         -------
-        dict or pandas.DataFrame
+        dict
-            List of features in the storage. If dictionary is returned, the
+            List of features in the storage. The keys are the feature names to
-            keys are the feature names to be used in read_features() and the
+            be used in read_features() and the values are the metadata of each
-            values are the metadata of each feature.
+            feature.
 
         """
         meta_df = pd.read_sql(
@@ -267,10 +221,11 @@ class SQLiteFeatureStorage(PandasBaseFeatureStorage):
             con=self.get_engine(),
             index_col="meta_md5",
         )
-        out = meta_df
+        meta_df.index = meta_df.index.str.replace(r"meta_", "")
-        # Return dictionary
+        out = meta_df.to_dict(orient="index")  # type: ignore
-        if return_df is False:
+        for md5, t_meta in out.items():
-            out = meta_df.to_dict(orient="index")  # type: ignore
+            for k, v in t_meta.items():
+                out[md5][k] = json.loads(v)
         return out
 
     def read_df(
@@ -327,7 +282,9 @@ class SQLiteFeatureStorage(PandasBaseFeatureStorage):
                 con=engine,
                 index_col="meta_md5",
             )
-            t_df = meta_df.query(f"name == '{feature_name}'")
+
+            # Wrap in double quotes as the fields are in JSON format
+            t_df = meta_df.query(f"name == '\"{feature_name}\"'")
             if len(t_df) == 0:
                 raise_error(msg=f"Feature {feature_name} not found")
             elif len(t_df) > 1:
@@ -339,8 +296,11 @@ class SQLiteFeatureStorage(PandasBaseFeatureStorage):
                     )
                 )
             table_name = f"meta_{t_df.index[0]}"
+        if table_name not in inspect(engine).get_table_names():
+            raise_error(msg=f"Feature MD5 {feature_md5} not found")
         # Read metadata from table
         df = pd.read_sql(sql=table_name, con=engine)
+
         # Read the index
         query = (
             "SELECT ii.name FROM sqlite_master AS m, "
@@ -356,36 +316,30 @@ class SQLiteFeatureStorage(PandasBaseFeatureStorage):
         df = df.set_index(index_names)
         return df
 
-    def store_metadata(self, meta: Dict) -> str:
+    def store_metadata(self, meta_md5: str, element: Dict, meta: Dict) -> None:
-        r"""Implement metadata storing in the storage.
+        """Implement metadata storing in the storage.
 
         Parameters
         ----------
+        meta_md5 : str
+            The metadata MD5 hash.
+        element : dict
+            The element as a dictionary.
         meta : dict
             The metadata as a dictionary.
-
-        Returns
-        -------
-        str
-            The MD5 hash of the metadata prefixed with "meta\_".
-
         """
-        # Copy metadata
-        t_meta = meta.copy()
-        # Update metadata
-        t_meta.update(self.get_meta())
-        # Process metadata
-        meta_md5, t_meta_row = process_meta(t_meta)
         # Get sqlalchemy engine
-        engine = self.get_engine(meta=t_meta)
+        engine = self.get_engine(element=element)
-        if meta_md5 not in inspect(engine).get_table_names():
+        table_name = f"meta_{meta_md5}"
+        if table_name not in inspect(engine).get_table_names():
             # Convert metadata to dataframe
-            meta_df = self._meta_row(meta=t_meta_row, meta_md5=meta_md5)
+            meta_df = self._meta_row(meta=meta, meta_md5=meta_md5)
             # Save dataframe
             self._save_upsert(meta_df, "meta", engine)
-        return f"meta_{meta_md5}"
 
-    def store_df(self, df: Union[pd.DataFrame, pd.Series], meta: Dict) -> None:
+    def store_df(
+        self, meta_md5: str, element: Dict, df: Union[pd.DataFrame, pd.Series]
+    ) -> None:
         """Implement pandas DataFrame storing.
 
         Parameters
@@ -405,7 +359,7 @@ class SQLiteFeatureStorage(PandasBaseFeatureStorage):
         # TODO: Test this function
         # Check that the index generated by meta matches the one in
         # the dataframe.
-        idx = element_to_index(meta)
+        idx = self.element_to_index(element)
         # Given the meta, we might not know if there is an extra column added
         # when storing a timeseries or 2d elements. We need to check if the
         # extra element is only one.
@@ -418,24 +372,25 @@ class SQLiteFeatureStorage(PandasBaseFeatureStorage):
         elif len(extra) == 1:
             # The df has one extra index item, this should be the new name
             # of the missing element in the index
-            idx = element_to_index(meta, rows_col_name=extra[0])
+            idx = self.element_to_index(element, rows_col_name=extra[0])
 
         if any(x not in df.index.names for x in idx.names):
             raise_error(
                 "The index of the dataframe is missing index items that are "
                 "generated from the metadata."
             )
-        # Get table name
+
-        table_name = self.store_metadata(meta)
+        table_name = f"meta_{meta_md5}"
         # Get sqlalchemy engine
-        engine = self.get_engine(meta)
+        engine = self.get_engine(element)
         # Save data
         self._save_upsert(df, table_name, engine)
 
     def store_matrix(
         self,
+        meta_md5: str,
+        element: Dict,
         data: np.ndarray,
-        meta: Dict,
         col_names: Optional[List[str]] = None,
         row_names: Optional[List[str]] = None,
         matrix_kind: Optional[str] = "full",
@@ -445,6 +400,10 @@ class SQLiteFeatureStorage(PandasBaseFeatureStorage):
 
         Parameters
         ----------
+        meta_md5 : str
+            The metadata MD5 hash.
+        element : dict
+            The element as a dictionary.
         data : numpy.ndarray
             The matrix data to store.
         meta : dict
@@ -465,7 +424,7 @@ class SQLiteFeatureStorage(PandasBaseFeatureStorage):
             (default "full").
         diagonal : bool, optional
             Whether to store the diagonal. If `matrix_kind` is "full", setting
-            this to False will raise an error (default True)..
+            this to False will raise an error (default True).
 
         """
         if diagonal is False and matrix_kind not in ["triu", "tril"]:
@@ -519,74 +478,27 @@ class SQLiteFeatureStorage(PandasBaseFeatureStorage):
 
         # Convert element metadata to index
         n_rows = 1
-        idx = element_to_index(meta=meta, n_rows=n_rows, rows_col_name=None)
+        idx = self.element_to_index(
+            element=element, n_rows=n_rows, rows_col_name=None
+        )
         # Prepare new dataframe
         data_df = pd.DataFrame(flat_data[None, :], columns=columns, index=idx)
 
-        if len(columns) > 2000:  # TODO: check SQLITE_MAX_COLUMN
+        if len(columns) > 2000:
+            warn_with_log(
+                msg="The number of columns is greater than 2000. "
+                "The data will be stored in long format. "
+                "This will make it slower to collect the data. "
+                "Future versions of junifer will provide additional storage "
+                "options that will not raise this warning.",
+            )
             data_df = data_df.stack()
             new_names = [x for x in data_df.index.names[:-1]]
             new_names.append("pair")
             data_df.index.names = new_names
 
         # Store dataframe
-        self.store_df(df=data_df, meta=meta)
+        self.store_df(meta_md5=meta_md5, element=element, df=data_df)
-
-    def store_table(
-        self,
-        data: Dict,
-        meta: Dict,
-        columns: Optional[Iterable[str]] = None,
-        rows_col_name: Optional[str] = None,
-    ) -> None:
-        """Implement table storing.
-
-        Parameters
-        ----------
-        data : dict
-            The table data to store.
-        meta : dict
-            The metadata as a dictionary.
-        columns : list or tuple of str, optional
-            The columns (default None).
-        rows_col_name : str, optional
-            The column name to use in case number of rows greater than 1.
-            If None and number of rows greater than 1, then the name will be
-            "index" (default None).
-
-        """
-        self._store_2d(
-            data=data, meta=meta, columns=columns, rows_col_name=rows_col_name
-        )
-
-    def store_timeseries(
-        self,
-        data: Dict,
-        meta: Dict,
-        columns: Optional[Iterable[str]] = None,
-        row_names: str = "timepoint",
-    ) -> None:
-        """Implement timeseries storing.
-
-        Parameters
-        ----------
-        data : dict
-            The timeseries data to store.
-        meta : dict
-            The metadata as a dictionary.
-        columns : list or tuple of str, optional
-            The column labels (default None).
-        row_names : str, optional
-            The column name to use in case number of rows greater than 1
-            (default "timepoint").
-
-        """
-        self._store_2d(
-            data=data,
-            meta=meta,
-            columns=columns,
-            rows_col_name="timepoint",  # explicit so as to stop overriding
-        )
 
     def collect(self) -> None:
         """Implement data collection.

junifer/storage/tests/test_pandas_base.py

@@ -0,0 +1,70 @@
+"""Provide tests for pandas base feature storage."""
+
+# Authors: Federico Raimondo <f.raimondo@fz-juelich.de>
+#          Synchon Mandal <s.mandal@fz-juelich.de>
+# License: AGPL
+
+from junifer.storage.pandas_base import PandasBaseFeatureStorage
+
+
+def test_element_to_index() -> None:
+    """Test element to index."""
+    element = {"foo": "bar"}
+    index = PandasBaseFeatureStorage.element_to_index(element)
+    assert index.names == ["foo", "idx"]
+    assert index.levels[0].name == "foo"
+    assert index.levels[0].values[0] == "bar"
+    assert all(x == "bar" for x in index.levels[0].values)
+    assert index.levels[0].values.shape == (1,)
+    assert index.levels[1].name == "idx"
+    assert all(x == i for i, x in enumerate(index.levels[1].values))
+    assert index.levels[1].values.shape == (1,)
+
+    index = PandasBaseFeatureStorage.element_to_index(element, n_rows=10)
+    assert index.names == ["foo", "idx"]
+    assert index.levels[0].name == "foo"
+    assert all(x == "bar" for x in index.levels[0].values)
+    assert index.levels[0].values.shape == (1,)
+
+    assert index.levels[1].name == "idx"
+    assert all(x == i for i, x in enumerate(index.levels[1].values))
+    assert index.levels[1].values.shape == (10,)
+
+    index = PandasBaseFeatureStorage.element_to_index(
+        element, n_rows=1, rows_col_name="scan"
+    )
+    assert index.names == ["foo", "scan"]
+    assert index.levels[0].name == "foo"
+    assert index.levels[0].values[0] == "bar"
+    assert all(x == "bar" for x in index.levels[0].values)
+    assert index.levels[0].values.shape == (1,)
+    assert index.levels[1].name == "scan"
+    assert all(x == i for i, x in enumerate(index.levels[1].values))
+    assert index.levels[1].values.shape == (1,)
+
+    index = PandasBaseFeatureStorage.element_to_index(
+        element, n_rows=7, rows_col_name="scan"
+    )
+    assert index.names == ["foo", "scan"]
+    assert index.levels[0].name == "foo"
+    assert all(x == "bar" for x in index.levels[0].values)
+    assert index.levels[0].values.shape == (1,)
+
+    assert index.levels[1].name == "scan"
+    assert all(x == i for i, x in enumerate(index.levels[1].values))
+    assert index.levels[1].values.shape == (7,)
+
+    element = {"subject": "sub-01", "session": "ses-01"}
+    index = PandasBaseFeatureStorage.element_to_index(element, n_rows=10)
+
+    assert index.levels[0].name == "subject"
+    assert all(x == "sub-01" for x in index.levels[0].values)
+    assert index.levels[0].values.shape == (1,)
+
+    assert index.levels[1].name == "session"
+    assert all(x == "ses-01" for x in index.levels[1].values)
+    assert index.levels[1].values.shape == (1,)
+
+    assert index.levels[2].name == "idx"
+    assert all(x == i for i, x in enumerate(index.levels[2].values))
+    assert index.levels[2].values.shape == (10,)

junifer/storage/tests/test_sqlite.py

@@ -15,47 +15,44 @@ from pandas.testing import assert_frame_equal
 from sqlalchemy import create_engine
 
 from junifer.storage.sqlite import SQLiteFeatureStorage
-from junifer.storage.utils import (
+from junifer.storage.utils import element_to_prefix, process_meta
-    element_to_index,
+
-    element_to_prefix,
-    process_meta,
-)
 
 df1 = pd.DataFrame(
     {
-        "element": [1, 2, 3, 4, 5],
+        "subject": [1, 2, 3, 4, 5],
         "pk2": ["a", "b", "c", "d", "e"],
         "col1": [11, 22, 33, 44, 55],
         "col2": [111, 222, 333, 444, 555],
     }
-).set_index(["element", "pk2"])
+).set_index(["subject", "pk2"])
 
 df2 = pd.DataFrame(
     {
-        "element": [2, 5, 6],
+        "subject": [2, 5, 6],
         "pk2": ["b", "e", "f"],
         "col1": [2222, 5555, 66],
         "col2": [22222, 55555, 666],
     }
-).set_index(["element", "pk2"])
+).set_index(["subject", "pk2"])
 
 df_update = pd.DataFrame(
     {
-        "element": [1, 2, 3, 4, 5, 6],
+        "subject": [1, 2, 3, 4, 5, 6],
         "pk2": ["a", "b", "c", "d", "e", "f"],
         "col1": [11, 2222, 33, 44, 5555, 66],
         "col2": [111, 22222, 333, 444, 55555, 666],
     }
-).set_index(["element", "pk2"])
+).set_index(["subject", "pk2"])
 
 df_ignore = pd.DataFrame(
     {
-        "element": [1, 2, 3, 4, 5, 6],
+        "subject": [1, 2, 3, 4, 5, 6],
         "pk2": ["a", "b", "c", "d", "e", "f"],
         "col1": [11, 22, 33, 44, 55, 66],
         "col2": [111, 222, 333, 444, 555, 666],
     }
-).set_index(["element", "pk2"])
+).set_index(["subject", "pk2"])
 
 
 def _read_sql(
@@ -148,15 +145,14 @@ def test_upsert_replace(tmp_path: Path) -> None:
     uri = tmp_path / "test_upsert_replace.sqlite"
     # Single storage, must be the uri
     storage = SQLiteFeatureStorage(uri=uri, upsert="ignore")
-    # Metadata to store
-    meta = {"element": "test", "version": "0.0.1"}
     # Save to database
-    storage.store_df(df=df1, meta=meta)
+    storage.store_df(
-    # Store metadata
+        meta_md5="table_name", element={"subject": "test"}, df=df1
-    table_name = storage.store_metadata(meta)
+    )
+    table_name = "meta_table_name"
     # Read stored table
     c_df1 = _read_sql(
-        table_name=table_name, uri=uri.as_posix(), index_col=["element", "pk2"]
+        table_name=table_name, uri=uri.as_posix(), index_col=["subject", "pk2"]
     )
     # Check if dataframes are equal
     assert_frame_equal(df1, c_df1)
@@ -164,7 +160,7 @@ def test_upsert_replace(tmp_path: Path) -> None:
     storage._save_upsert(df=df2, name=table_name, if_exists="replace")
     # Read stored table
     c_df2 = _read_sql(
-        table_name=table_name, uri=uri.as_posix(), index_col=["element", "pk2"]
+        table_name=table_name, uri=uri.as_posix(), index_col=["subject", "pk2"]
     )
     # Check if dataframes are equal
     assert_frame_equal(df2, c_df2)
@@ -182,24 +178,25 @@ def test_upsert_ignore(tmp_path: Path) -> None:
     uri = tmp_path / "test_upsert_ignore.sqlite"
     # Single storage, must be the uri
     storage = SQLiteFeatureStorage(uri=uri, upsert="ignore")
-    # Metadata to store
-    meta = {"element": "test", "version": "0.0.1"}
     # Save to database
-    storage.store_df(df=df1, meta=meta)
+    storage.store_df(
-    # Store metadata
+        meta_md5="table_name", element={"subject": "test"}, df=df1
-    table_name = storage.store_metadata(meta=meta)
+    )
+    table_name = "meta_table_name"
     # Read stored table
     c_df1 = _read_sql(
-        table_name=table_name, uri=uri.as_posix(), index_col=["element", "pk2"]
+        table_name=table_name, uri=uri.as_posix(), index_col=["subject", "pk2"]
     )
     # Check if dataframes are equal
     assert_frame_equal(df1, c_df1)
     # Check for warning
     with pytest.warns(RuntimeWarning, match="are already present"):
-        storage.store_df(df2, meta)
+        storage.store_df(
+            meta_md5="table_name", element={"subject": "test"}, df=df2
+        )
     # Read stored table
     c_dfignore = _read_sql(
-        table_name, uri=uri.as_posix(), index_col=["element", "pk2"]
+        table_name, uri=uri.as_posix(), index_col=["subject", "pk2"]
     )
     # Check if dataframes are equal
     assert_frame_equal(c_dfignore, df_ignore)
@@ -219,23 +216,24 @@ def test_upsert_update(tmp_path: Path) -> None:
     """
     uri = tmp_path / "test_upsert_delete.sqlite"
     storage = SQLiteFeatureStorage(uri=uri)
-    # Metadata to store
-    meta = {"element": "test", "version": "0.0.1"}
     # Save to database
-    storage.store_df(df1, meta)
+    storage.store_df(
-    # Store metadata
+        meta_md5="table_name", element={"subject": "test"}, df=df1
-    table_name = storage.store_metadata(meta)
+    )
+    table_name = "meta_table_name"
     # Read stored table
     c_df1 = _read_sql(
-        table_name=table_name, uri=uri.as_posix(), index_col=["element", "pk2"]
+        table_name=table_name, uri=uri.as_posix(), index_col=["subject", "pk2"]
     )
     # Check if dataframes are equal
     assert_frame_equal(df1, c_df1)
     # Save to database
-    storage.store_df(df2, meta)
+    storage.store_df(
+        meta_md5="table_name", element={"subject": "test"}, df=df2
+    )
     # Read stored table
     c_dfupdate = _read_sql(
-        table_name, uri=uri.as_posix(), index_col=["element", "pk2"]
+        table_name, uri=uri.as_posix(), index_col=["subject", "pk2"]
     )
     # Check if dataframes are equal
     assert_frame_equal(c_dfupdate, df_update)
@@ -268,50 +266,66 @@ def test_store_df_and_read_df(tmp_path: Path) -> None:
     uri = tmp_path / "test_store_df_and_read_df.sqlite"
     storage = SQLiteFeatureStorage(uri=uri, upsert="ignore")
     # Metadata to store
+    meta_md5 = "feature_md5"
+    element = {"subject": "test"}
     meta = {
-        "element": "test",
+        "element": element,
-        "version": "0.0.1",
+        "dependencies": ["numpy"],
-        "marker": {"name": "fcname"},
+        "marker": {
+            "name": "markername",
+        },
+        "type": "BOLD",
     }
+
+    _, meta_to_store, element_to_store = process_meta(meta)
+    # Store metadata
+    storage.store_metadata(
+        meta_md5="feature_md5", element=element_to_store, meta=meta_to_store
+    )
+
     # Columns to store
     to_store = df1[["col1", "col2"]]
     # Check for error while storing
     with pytest.raises(ValueError, match=r"missing index items"):
-        storage.store_df(to_store.set_index("col1"), meta)
+        storage.store_df(
+            meta_md5=meta_md5, element=element, df=to_store.set_index("col1")
+        )
     # Set index
-    to_store = df1.reset_index().set_index(["element", "pk2", "col1"])
+    to_store = df1.reset_index().set_index(["subject", "pk2", "col1"])
     # Check for error while storing
     with pytest.raises(ValueError, match=r"extra items"):
-        storage.store_df(to_store, meta)
+        storage.store_df(meta_md5=meta_md5, element=element, df=to_store)
     # Convert element to index
-    idx = element_to_index(meta, n_rows=len(to_store))
+    idx = storage.element_to_index(element=element, n_rows=len(to_store))
     # Set index
     to_store = to_store.set_index(idx)
     # Store dataframe
-    storage.store_df(to_store, meta)
+    storage.store_df(meta_md5=meta_md5, element=element, df=to_store)
-    # Store metadata
+
-    table_name = storage.store_metadata(meta)
     # List stored features
     features = storage.list_features()
     # Check correct usage
     assert len(features) == 1
-    assert table_name.replace("meta_", "") in features
+    assert "feature_md5" in features
     # Check for missing feature
     with pytest.raises(ValueError, match="not found"):
-        storage.read_df("wrong_md5")
+        storage.read_df(feature_md5="wrong_md5")
+    with pytest.raises(ValueError, match="not found"):
+        storage.read_df(feature_name="wrong_name")
     # Check for missing feature to fetch
     with pytest.raises(ValueError, match="least one"):
         storage.read_df()
     # Check for multiple features to fetch
     with pytest.raises(ValueError, match="Only one"):
-        storage.read_df("wrong_md5", "wrong_name")
+        storage.read_df(feature_name="wrong_name", feature_md5="wrong_md5")
     # Get MD5 hash of features
     feature_md5 = list(features.keys())[0]
+    assert "feature_md5" == feature_md5
     # Check for key
-    assert "fcname" == features[feature_md5]["name"]
+    assert "BOLD_markername" == features[feature_md5]["name"]
     # Read into dataframes
     read_df1 = storage.read_df(feature_md5=feature_md5)
-    read_df2 = storage.read_df(feature_name="fcname")
+    read_df2 = storage.read_df(feature_name="BOLD_markername")
     # Check if dataframes are equal
     assert_frame_equal(read_df1, read_df2)
     assert_frame_equal(read_df1, to_store)
@@ -330,10 +344,21 @@ def test_store_metadata(tmp_path: Path) -> None:
     # Single storage, must be the uri
     storage = SQLiteFeatureStorage(uri=uri, upsert="ignore")
     # Metadata to store
-    meta = {"element": "test", "version": "0.0.1"}
+    meta = {
+        "element": {"subject": "test"},
+        "dependencies": ["numpy"],
+        "marker": {"name": "test"},
+        "type": "BOLD",
+    }
+
+    meta_md5, meta_to_store, element_to_store = process_meta(meta)
     # Store metadata
-    table_name = storage.store_metadata(meta)
+    storage.store_metadata(
-    assert table_name.startswith("meta_")
+        meta_md5=meta_md5, element=element_to_store, meta=meta_to_store
+    )
+    features = storage.list_features()
+    feature_md5 = list(features.keys())[0]
+    assert meta_md5 == feature_md5
 
 
 def test_store_table(tmp_path: Path) -> None:
@@ -348,7 +373,21 @@ def test_store_table(tmp_path: Path) -> None:
     uri = tmp_path / "test_store_table.sqlite"
     storage = SQLiteFeatureStorage(uri=uri)
     # Metadata to store
-    meta = {"element": "test", "version": "0.0.1", "marker": {"name": "fc"}}
+    element = {"subject": "test"}
+    dependencies = ["numpy"]
+    meta = {
+        "element": element,
+        "dependencies": dependencies,
+        "marker": {"name": "fc"},
+        "type": "BOLD",
+    }
+
+    meta_md5, meta_to_store, element_to_store = process_meta(meta)
+    # Store metadata
+    storage.store_metadata(
+        meta_md5=meta_md5, element=element_to_store, meta=meta_to_store
+    )
+
     # Data to store
     data = [
         [1, 10],
@@ -358,18 +397,23 @@ def test_store_table(tmp_path: Path) -> None:
         [5, 50],
     ]
     # Convert element to index
-    idx = element_to_index(meta, n_rows=5, rows_col_name="scan")
+    idx = storage.element_to_index(element, n_rows=5, rows_col_name="scan")
     # Create dataframe
     df = pd.DataFrame(data, columns=["f1", "f2"], index=idx)
+
     # Store table
-    storage.store_table(data, meta, columns=["f1", "f2"], rows_col_name="scan")
+    storage.store_table(
-    # Store metadata
+        meta_md5=meta_md5,
-    table_name = storage.store_metadata(meta)
+        element=element_to_store,
+        data=data,
+        columns=["f1", "f2"],
+        rows_col_name="scan",
+    )
     # Read stored table
     c_df = _read_sql(
-        table_name=table_name,
+        table_name=f"meta_{meta_md5}",
         uri=uri.as_posix(),
-        index_col=["element", "scan"],
+        index_col=["subject", "scan"],
     )
     # Check if dataframes are equal
     assert_frame_equal(df, c_df)
@@ -377,19 +421,24 @@ def test_store_table(tmp_path: Path) -> None:
     # New data to store
     data_new = [[1, 10], [2, 20], [3, 300], [4, 40], [5, 50], [6, 600]]
     # Convert element to index
-    idx_new = element_to_index(meta, n_rows=6, rows_col_name="scan")
+    idx_new = storage.element_to_index(element, n_rows=6, rows_col_name="scan")
     # Create dataframe
     df_new = pd.DataFrame(data_new, columns=["f1", "f2"], index=idx_new)
     # Check warning
     with pytest.warns(RuntimeWarning, match=r"Some rows"):
+        # Store table
         storage.store_table(
-            data_new, meta, columns=["f1", "f2"], rows_col_name="scan"
+            meta_md5=meta_md5,
+            element=element_to_store,
+            data=data_new,
+            columns=["f1", "f2"],
+            rows_col_name="scan",
         )
     # Read stored table
     c_df_new = _read_sql(
-        table_name=table_name,
+        table_name=f"meta_{meta_md5}",
         uri=uri.as_posix(),
-        index_col=["element", "scan"],
+        index_col=["subject", "scan"],
     )
     # Check if dataframes are equal
     assert_frame_equal(df_new, c_df_new)
@@ -407,7 +456,20 @@ def test_store_matrix(tmp_path: Path) -> None:
     uri = tmp_path / "test_store_table.sqlite"
     storage = SQLiteFeatureStorage(uri=uri)
     # Metadata to store
-    meta = {"element": "test", "version": "0.0.1", "marker": {"name": "fc"}}
+    element = {"subject": "test"}
+    dependencies = ["numpy"]
+    meta = {
+        "element": element,
+        "dependencies": dependencies,
+        "marker": {"name": "fc"},
+        "type": "BOLD",
+    }
+
+    meta_md5, meta_to_store, element_to_store = process_meta(meta)
+    # Store metadata
+    storage.store_metadata(
+        meta_md5=meta_md5, element=element_to_store, meta=meta_to_store
+    )
 
     # Store 4 x 3 full matrix
     data = np.array(
@@ -418,17 +480,17 @@ def test_store_matrix(tmp_path: Path) -> None:
 
     # Store table
     storage.store_matrix(
+        meta_md5=meta_md5,
+        element=element_to_store,
         data=data,
-        meta=meta,
         row_names=row_names,
         col_names=col_names,
     )
-
     stored_names = [f"{i}~{j}" for i in row_names for j in col_names]
 
     features = storage.list_features()
     feature_md5 = list(features.keys())[0]
-    assert "fc" == features[feature_md5]["name"]
+    assert "BOLD_fc" == features[feature_md5]["name"]
 
     read_df = storage.read_df(feature_md5=feature_md5)
     assert read_df.shape == (1, 12)
@@ -437,7 +499,14 @@ def test_store_matrix(tmp_path: Path) -> None:
     # Store without row and column names
     uri = tmp_path / "test_store_table_nonames.sqlite"
     storage = SQLiteFeatureStorage(uri=uri)
-    storage.store_matrix(data=data, meta=meta)
+    # Store metadata
+    storage.store_metadata(
+        meta_md5=meta_md5, element=element_to_store, meta=meta_to_store
+    )
+    # Store table
+    storage.store_matrix(
+        meta_md5=meta_md5, element=element_to_store, data=data
+    )
     stored_names = [
         f"r{i}~c{j}"
         for i in range(data.shape[0])
@@ -445,20 +514,37 @@ def test_store_matrix(tmp_path: Path) -> None:
     ]
     features = storage.list_features()
     feature_md5 = list(features.keys())[0]
-    assert "fc" == features[feature_md5]["name"]
+    assert "BOLD_fc" == features[feature_md5]["name"]
     read_df = storage.read_df(feature_md5=feature_md5)
     assert list(read_df.columns) == stored_names
 
     with pytest.raises(ValueError, match="Invalid kind"):
-        storage.store_matrix(data=data, meta=meta, matrix_kind="wrong")
+        storage.store_matrix(
+            meta_md5=meta_md5,
+            element=element_to_store,
+            data=data,
+            row_names=row_names,
+            col_names=col_names,
+            matrix_kind="wrong",
+        )
 
     with pytest.raises(ValueError, match="non-square"):
-        storage.store_matrix(data=data, meta=meta, matrix_kind="triu")
+        storage.store_matrix(
+            meta_md5=meta_md5,
+            element=element_to_store,
+            data=data,
+            row_names=row_names,
+            col_names=col_names,
+            matrix_kind="triu",
+        )
 
     with pytest.raises(ValueError, match="cannot be False"):
         storage.store_matrix(
+            meta_md5=meta_md5,
+            element=element_to_store,
             data=data,
-            meta=meta,
+            row_names=row_names,
+            col_names=col_names,
             matrix_kind="full",
             diagonal=False,
         )
@@ -469,12 +555,17 @@ def test_store_matrix(tmp_path: Path) -> None:
     col_names = ["col1", "col2", "col3"]
     uri = tmp_path / "test_store_table_triu.sqlite"
     storage = SQLiteFeatureStorage(uri=uri)
+    # Store metadata
+    storage.store_metadata(
+        meta_md5=meta_md5, element=element_to_store, meta=meta_to_store
+    )
     storage.store_matrix(
+        meta_md5=meta_md5,
+        element=element_to_store,
         data=data,
-        meta=meta,
-        matrix_kind="triu",
         row_names=row_names,
         col_names=col_names,
+        matrix_kind="triu",
     )
 
     stored_names = [
@@ -488,7 +579,7 @@ def test_store_matrix(tmp_path: Path) -> None:
 
     features = storage.list_features()
     feature_md5 = list(features.keys())[0]
-    assert "fc" == features[feature_md5]["name"]
+    assert "BOLD_fc" == features[feature_md5]["name"]
     read_df = storage.read_df(feature_md5=feature_md5)
     assert list(read_df.columns) == stored_names
     assert_array_equal(
@@ -498,12 +589,17 @@ def test_store_matrix(tmp_path: Path) -> None:
     # Store upper triangular matrix without diagonal
     uri = tmp_path / "test_store_table_triu_nodiagonal.sqlite"
     storage = SQLiteFeatureStorage(uri=uri)
+    # Store metadata
+    storage.store_metadata(
+        meta_md5=meta_md5, element=element_to_store, meta=meta_to_store
+    )
     storage.store_matrix(
+        meta_md5=meta_md5,
+        element=element_to_store,
         data=data,
-        meta=meta,
-        matrix_kind="triu",
         row_names=row_names,
         col_names=col_names,
+        matrix_kind="triu",
         diagonal=False,
     )
 
@@ -515,7 +611,7 @@ def test_store_matrix(tmp_path: Path) -> None:
 
     features = storage.list_features()
     feature_md5 = list(features.keys())[0]
-    assert "fc" == features[feature_md5]["name"]
+    assert "BOLD_fc" == features[feature_md5]["name"]
     read_df = storage.read_df(feature_md5=feature_md5)
     assert list(read_df.columns) == stored_names
     assert_array_equal(
@@ -528,12 +624,17 @@ def test_store_matrix(tmp_path: Path) -> None:
     col_names = ["col1", "col2", "col3"]
     uri = tmp_path / "test_store_table_tril.sqlite"
     storage = SQLiteFeatureStorage(uri=uri)
+    # Store metadata
+    storage.store_metadata(
+        meta_md5=meta_md5, element=element_to_store, meta=meta_to_store
+    )
     storage.store_matrix(
+        meta_md5=meta_md5,
+        element=element_to_store,
         data=data,
-        meta=meta,
-        matrix_kind="tril",
         row_names=row_names,
         col_names=col_names,
+        matrix_kind="tril",
     )
 
     stored_names = [
@@ -547,7 +648,7 @@ def test_store_matrix(tmp_path: Path) -> None:
 
     features = storage.list_features()
     feature_md5 = list(features.keys())[0]
-    assert "fc" == features[feature_md5]["name"]
+    assert "BOLD_fc" == features[feature_md5]["name"]
     read_df = storage.read_df(feature_md5=feature_md5)
     assert list(read_df.columns) == stored_names
     assert_array_equal(
@@ -557,15 +658,19 @@ def test_store_matrix(tmp_path: Path) -> None:
     # Store lower triangular matrix without diagonal
     uri = tmp_path / "test_store_table_tril_nodiagonal.sqlite"
     storage = SQLiteFeatureStorage(uri=uri)
+    # Store metadata
+    storage.store_metadata(
+        meta_md5=meta_md5, element=element_to_store, meta=meta_to_store
+    )
     storage.store_matrix(
-        data,
+        meta_md5=meta_md5,
-        meta,
+        element=element_to_store,
-        matrix_kind="tril",
+        data=data,
         row_names=row_names,
         col_names=col_names,
+        matrix_kind="tril",
         diagonal=False,
     )
-
     stored_names = [
         "row2~col1",
         "row3~col1",
@@ -574,7 +679,7 @@ def test_store_matrix(tmp_path: Path) -> None:
 
     features = storage.list_features()
     feature_md5 = list(features.keys())[0]
-    assert "fc" == features[feature_md5]["name"]
+    assert "BOLD_fc" == features[feature_md5]["name"]
     read_df = storage.read_df(feature_md5=feature_md5)
     assert list(read_df.columns) == stored_names
     assert_array_equal(
@@ -597,18 +702,21 @@ def test_store_multiple_output(tmp_path: Path):
     # Metadata to store
     meta1 = {
         "element": {"subject": "test-01", "session": "ses-01"},
-        "version": "0.0.1",
+        "dependencies": ["numpy"],
         "marker": {"name": "fc"},
+        "type": "BOLD",
     }
     meta2 = {
         "element": {"subject": "test-02", "session": "ses-01"},
-        "version": "0.0.1",
+        "dependencies": ["numpy"],
         "marker": {"name": "fc"},
+        "type": "BOLD",
     }
     meta3 = {
         "element": {"subject": "test-01", "session": "ses-02"},
-        "version": "0.0.1",
+        "dependencies": ["numpy"],
         "marker": {"name": "fc"},
+        "type": "BOLD",
     }
     # Data to store
     data1 = np.array(
@@ -623,35 +731,62 @@ def test_store_multiple_output(tmp_path: Path):
     data2 = data1 * 10
     data3 = data1 * 20
     # Process metadata for storage
-    hash1, _ = process_meta(meta1)
+    hash1, meta_to_store1, element_to_store1 = process_meta(meta1)
     # Convert element to index
-    idx1 = element_to_index(meta1, n_rows=5, rows_col_name="scan")
+    idx1 = storage.element_to_index(
+        element_to_store1, n_rows=5, rows_col_name="scan"
+    )
     # Create dataframe
     df1 = pd.DataFrame(data1, columns=["f1", "f2"], index=idx1)
     # Process metadata for storage
-    hash2, _ = process_meta(meta2)
+    hash2, meta_to_store2, element_to_store2 = process_meta(meta2)
     # Convert element to index
-    idx2 = element_to_index(meta2, n_rows=5, rows_col_name="scan")
+    idx2 = storage.element_to_index(
+        element_to_store2, n_rows=5, rows_col_name="scan"
+    )
     # Create dataframe
     df2 = pd.DataFrame(data2, columns=["f1", "f2"], index=idx2)
     # Process metadata for storage
-    hash3, _ = process_meta(meta3)
+    hash3, meta_to_store3, element_to_store3 = process_meta(meta3)
     # Convert element to index
-    idx3 = element_to_index(meta3, n_rows=5, rows_col_name="scan")
+    idx3 = storage.element_to_index(
+        element_to_store3, n_rows=5, rows_col_name="scan"
+    )
     # Create dataframe
     df3 = pd.DataFrame(data3, columns=["f1", "f2"], index=idx3)
     # Check hash equality
     assert hash1 == hash2
     assert hash2 == hash3
     # Store tables
-    storage.store_table(
+    storage.store_metadata(
-        data1, meta1, columns=["f1", "f2"], rows_col_name="scan"
+        meta_md5=hash1, element=element_to_store1, meta=meta_to_store1
+    )
+    storage.store_metadata(
+        meta_md5=hash2, element=element_to_store2, meta=meta_to_store2
+    )
+    storage.store_metadata(
+        meta_md5=hash3, element=element_to_store3, meta=meta_to_store3
     )
     storage.store_table(
-        data2, meta2, columns=["f1", "f2"], rows_col_name="scan"
+        meta_md5=hash1,
+        element=element_to_store1,
+        data=data1,
+        columns=["f1", "f2"],
+        rows_col_name="scan",
     )
     storage.store_table(
-        data3, meta3, columns=["f1", "f2"], rows_col_name="scan"
+        meta_md5=hash2,
+        element=element_to_store2,
+        data=data2,
+        columns=["f1", "f2"],
+        rows_col_name="scan",
+    )
+    storage.store_table(
+        meta_md5=hash3,
+        element=element_to_store3,
+        data=data3,
+        columns=["f1", "f2"],
+        rows_col_name="scan",
     )
     # Check that URI does not exist yet
     assert not uri.exists()
@@ -667,10 +802,9 @@ def test_store_multiple_output(tmp_path: Path):
     assert uri1.exists()
     assert uri2.exists()
     assert uri3.exists()
-    # Store metadata
-    table_name = storage.store_metadata(meta1)
     # Set index columns
     cols = ["subject", "session", "scan"]
+    table_name = f"meta_{hash1}"
     # Read stored tables
     cdf1 = _read_sql(table_name, uri1.as_posix(), index_col=cols)
     cdf2 = _read_sql(table_name, uri2.as_posix(), index_col=cols)
@@ -696,18 +830,21 @@ def test_collect(tmp_path: Path) -> None:
     # Metadata for storage
     meta1 = {
         "element": {"subject": "test-01", "session": "ses-01"},
-        "version": "0.0.1",
+        "dependencies": ["numpy"],
         "marker": {"name": "fc"},
+        "type": "BOLD",
     }
     meta2 = {
         "element": {"subject": "test-02", "session": "ses-01"},
-        "version": "0.0.1",
+        "dependencies": ["numpy"],
         "marker": {"name": "fc"},
+        "type": "BOLD",
     }
     meta3 = {
         "element": {"subject": "test-01", "session": "ses-02"},
-        "version": "0.0.1",
+        "dependencies": ["numpy"],
         "marker": {"name": "fc"},
+        "type": "BOLD",
     }
     # Data for storage
     data1 = np.array(
@@ -722,14 +859,38 @@ def test_collect(tmp_path: Path) -> None:
     data2 = data1 * 10
     data3 = data1 * 20
     # Store tables
-    storage.store_table(
+    hash1, meta_to_store1, element_to_store1 = process_meta(meta1)
-        data1, meta1, columns=["f1", "f2"], rows_col_name="scan"
+    hash2, meta_to_store2, element_to_store2 = process_meta(meta2)
+    hash3, meta_to_store3, element_to_store3 = process_meta(meta3)
+    storage.store_metadata(
+        meta_md5=hash1, element=element_to_store1, meta=meta_to_store1
+    )
+    storage.store_metadata(
+        meta_md5=hash2, element=element_to_store2, meta=meta_to_store2
+    )
+    storage.store_metadata(
+        meta_md5=hash3, element=element_to_store3, meta=meta_to_store3
     )
     storage.store_table(
-        data2, meta2, columns=["f1", "f2"], rows_col_name="scan"
+        meta_md5=hash1,
+        element=element_to_store1,
+        data=data1,
+        columns=["f1", "f2"],
+        rows_col_name="scan",
     )
     storage.store_table(
-        data3, meta3, columns=["f1", "f2"], rows_col_name="scan"
+        meta_md5=hash2,
+        element=element_to_store2,
+        data=data2,
+        columns=["f1", "f2"],
+        rows_col_name="scan",
+    )
+    storage.store_table(
+        meta_md5=hash3,
+        element=element_to_store3,
+        data=data3,
+        columns=["f1", "f2"],
+        rows_col_name="scan",
     )
     # Convert element to prefix
     prefix1 = element_to_prefix(meta1["element"])
@@ -752,7 +913,7 @@ def test_collect(tmp_path: Path) -> None:
     # Set index columns
     cols = ["subject", "session", "scan"]
     # Store metadata
-    table_name = storage.store_metadata(meta1)
+    table_name = f"meta_{hash1}"
     # Read stored tables
     all_df = _read_sql(table_name, uri.as_posix(), index_col=cols)
     cdf1 = _read_sql(table_name, uri1.as_posix(), index_col=cols)

junifer/storage/tests/test_storage_base.py

@@ -12,7 +12,7 @@ from junifer.storage.base import BaseFeatureStorage
 def test_BaseFeatureStorage_abstractness() -> None:
     """Test BaseFeatureStorage is abstract base class."""
     with pytest.raises(TypeError, match=r"abstract"):
-        BaseFeatureStorage(uri="/tmp", storage_types=["matrix"])
+        BaseFeatureStorage(uri="/tm", storage_types=["matrix"])  # type: ignore
 
 
 def test_BaseFeatureStorage() -> None:
@@ -22,13 +22,16 @@ def test_BaseFeatureStorage() -> None:
         """Implement concrete class."""
 
         def __init__(self, uri, single_output=False):
-            storage_types = ["matrix"]
+            storage_types = ["matrix", "table", "timeseries"]
             super().__init__(
                 uri=uri,
                 storage_types=storage_types,
                 single_output=single_output,
             )
 
+        def get_valid_inputs(self):
+            return ["matrix", "table", "timeseries"]
+
         def list_features(self):
             super().list_features()
 
@@ -38,8 +41,8 @@ def test_BaseFeatureStorage() -> None:
                 feature_md5=feature_md5,
             )
 
-        def store_metadata(self, metadata):
+        def store_metadata(self, meta_md5, meta, element):
-            super().store_metadata(metadata)
+            super().store_metadata(meta_md5, meta, element)
 
         def collect(self):
             return super().collect()
@@ -55,7 +58,7 @@ def test_BaseFeatureStorage() -> None:
     st.validate(input_=["matrix"])
     # Check validate with invalid argument
     with pytest.raises(ValueError):
-        st.validate(input_=["table"])
+        st.validate(input_=["duck"])
 
     with pytest.raises(NotImplementedError):
         st.list_features()
@@ -63,22 +66,31 @@ def test_BaseFeatureStorage() -> None:
     with pytest.raises(NotImplementedError):
         st.read_df(None)
 
+    element = {"subject": "test"}
+    dependencies = ["numpy"]
+    meta = {
+        "element": element,
+        "dependencies": dependencies,
+        "marker": {"name": "fc"},
+        "type": "BOLD",
+    }
+
     with pytest.raises(NotImplementedError):
-        st.store_metadata(None)
+        st.store(kind="matrix", meta=meta)
+
+    with pytest.raises(NotImplementedError):
+        st.store_metadata("md5", meta=meta, element={})
 
     with pytest.raises(NotImplementedError):
         st.collect()
 
     with pytest.raises(NotImplementedError):
-        st.store(kind="matrix")
+        st.store(kind="timeseries", meta=meta)
 
     with pytest.raises(NotImplementedError):
-        st.store(kind="timeseries")
+        st.store(kind="table", meta=meta)
-
-    with pytest.raises(NotImplementedError):
-        st.store(kind="table")
 
     with pytest.raises(ValueError):
-        st.store(kind="lego")
+        st.store(kind="lego", meta=meta)
 
     assert st.uri == "/tmp"

junifer/storage/tests/test_utils.py

@@ -4,17 +4,51 @@
 #          Synchon Mandal <s.mandal@fz-juelich.de>
 # License: AGPL
 
-from typing import Dict, List, Tuple, Union
+from typing import Dict, List
 
 import pytest
 
 from junifer.storage.utils import (
-    element_to_index,
     element_to_prefix,
+    get_dependency_version,
     process_meta,
 )
 
 
+@pytest.mark.parametrize(
+    "dependency, max_version",
+    [
+        ("click", "8.2"),
+        ("numpy", "1.24"),
+        ("datalad", "0.18"),
+        ("pandas", "1.6"),
+        ("nibabel", "4.1"),
+        ("nilearn", "1.0"),
+        ("sqlalchemy", "1.5.0"),
+        ("pyyaml", "7.0"),
+    ],
+)
+def test_get_dependency_version(dependency: str, max_version: str) -> None:
+    """Test dependency resolution for installed dependencies.
+
+    Parameters
+    ----------
+    dependency : str
+        The parametrized dependency name.
+    max_version : str
+        The parametrized maximum version of the dependency.
+
+    """
+    version = get_dependency_version(dependency)
+    assert version < max_version
+
+
+def test_get_dependency_version_invalid() -> None:
+    """Test invalid package name handling for dependency resolution."""
+    with pytest.raises(ValueError, match="Could not obtain"):
+        get_dependency_version("foobar")
+
+
 def test_process_meta_invalid_metadata_type() -> None:
     """Test invalid metadata type check for metadata hash processing."""
     meta = None
@@ -25,58 +59,133 @@ def test_process_meta_invalid_metadata_type() -> None:
 # TODO: parameterize
 def test_process_meta_hash() -> None:
     """Test metadata hash processing."""
-    meta = {"element": "foo", "A": 1, "B": [2, 3, 4, 5, 6]}
+    meta = {
-    hash1, _ = process_meta(meta)
+        "element": {"foo": "bar"},
+        "A": 1,
+        "B": [2, 3, 4, 5, 6],
+        "dependencies": ["numpy"],
+        "marker": {"name": "fc"},
+        "type": "BOLD",
+    }
+    hash1, _, element1 = process_meta(meta)
+    assert element1 == {"foo": "bar"}
 
-    meta = {"element": "foo", "B": [2, 3, 4, 5, 6], "A": 1}
+    meta = {
-    hash2, _ = process_meta(meta)
+        "element": {"foo": "baz"},
+        "B": [2, 3, 4, 5, 6],
+        "A": 1,
+        "dependencies": ["numpy"],
+        "marker": {"name": "fc"},
+        "type": "BOLD",
+    }
+    hash2, _, element2 = process_meta(meta)
     assert hash1 == hash2
+    assert element2 == {"foo": "baz"}
 
-    meta = {"element": "foo", "A": 1, "B": [2, 3, 1, 5, 6]}
+    meta = {
-    hash3, _ = process_meta(meta)
+        "element": {"foo": "bar"},
+        "A": 1,
+        "B": [2, 3, 1, 5, 6],
+        "dependencies": ["numpy"],
+        "marker": {"name": "fc"},
+        "type": "BOLD",
+    }
+    hash3, _, element3 = process_meta(meta)
     assert hash1 != hash3
+    assert element3 == element1
 
-    meta1 = {
+    meta4 = {
-        "element": "foo",
+        "element": {"foo": "bar"},
         "B": {
             "B2": [2, 3, 4, 5, 6],
             "B1": [9.22, 3.14, 1.41, 5.67, 6.28],
             "B3": (1, "car"),
         },
         "A": 1,
+        "dependencies": ["numpy"],
+        "marker": {"name": "fc"},
+        "type": "BOLD",
     }
 
-    meta2 = {
+    meta5 = {
         "A": 1,
         "B": {
             "B3": (1, "car"),
             "B1": [9.22, 3.14, 1.41, 5.67, 6.28],
             "B2": [2, 3, 4, 5, 6],
         },
-        "element": "foo",
+        "element": {"foo": "baz"},
+        "dependencies": ["numpy"],
+        "marker": {"name": "fc"},
+        "type": "BOLD",
     }
 
-    hash4, _ = process_meta(meta1)
+    hash4, _, _ = process_meta(meta4)
-    hash5, _ = process_meta(meta2)
+    hash5, _, _ = process_meta(meta5)
     assert hash4 == hash5
 
+    # Different element keys should give a different hash
+    meta6 = {
+        "A": 1,
+        "B": {
+            "B3": (1, "car"),
+            "B1": [9.22, 3.14, 1.41, 5.67, 6.28],
+            "B2": [2, 3, 4, 5, 6],
+        },
+        "element": {"bar": "baz"},
+        "dependencies": ["numpy"],
+        "marker": {"name": "fc"},
+        "type": "BOLD",
+    }
+    hash6, _, _ = process_meta(meta6)
+    assert hash4 != hash6
+
 
 def test_process_meta_invalid_metadata_key() -> None:
     """Test invalid metadata key check for metadata hash processing."""
     meta = {}
-    with pytest.raises(ValueError, match=r"_element_keys"):
+    with pytest.raises(ValueError, match=r"element"):
+        process_meta(meta)
+
+    meta = {"element": {}}
+    with pytest.raises(ValueError, match=r"marker"):
+        process_meta(meta)
+
+    meta = {"element": {}, "marker": {}}
+    with pytest.raises(ValueError, match=r"key 'name'"):
+        process_meta(meta)
+
+    meta = {"element": {}, "marker": {"name": "test"}}
+    with pytest.raises(ValueError, match=r"key 'type'"):
+        process_meta(meta)
+
+    meta = {"element": {}, "marker": {"name": "test"}, "type": "BOLD"}
+    with pytest.raises(ValueError, match=r"dependencies"):
         process_meta(meta)
 
 
 @pytest.mark.parametrize(
     "meta,elements",
     [
-        ({"element": "foo", "A": 1, "B": [2, 3, 4, 5, 6]}, ["element"]),
+        (
+            {
+                "element": {"foo": "bar"},
+                "A": 1,
+                "B": [2, 3, 4, 5, 6],
+                "dependencies": ["numpy"],
+                "marker": {"name": "fc"},
+                "type": "BOLD",
+            },
+            ["foo"],
+        ),
         (
             {
                 "element": {"subject": "foo", "session": "bar"},
                 "B": [2, 3, 4, 5, 6],
                 "A": 1,
+                "dependencies": ["numpy"],
+                "marker": {"name": "fc"},
+                "type": "BOLD",
             },
             ["subject", "session"],
         ),
@@ -93,34 +202,30 @@ def test_process_meta_element(meta: Dict, elements: List[str]) -> None:
         The parametrized elements to assert against.
 
     """
-    hash1, processed_meta = process_meta(meta)
+    hash1, processed_meta, _ = process_meta(meta)
     assert "_element_keys" in processed_meta
     assert processed_meta["_element_keys"] == elements
     assert "A" in processed_meta
     assert "B" in processed_meta
     assert "element" not in processed_meta
-    hash2, processed_meta2 = process_meta(processed_meta)
+    assert isinstance(processed_meta["dependencies"], Dict)
-
+    assert all(
-    assert hash1, hash2
+        x in processed_meta["dependencies"] for x in meta["dependencies"]
-    assert processed_meta == processed_meta2
+    )
+    assert "name" in processed_meta
+    assert processed_meta["name"] == f"{meta['type']}_{meta['marker']['name']}"
 
 
 @pytest.mark.parametrize(
     "element,prefix",
     [
-        ("sub-01", "element_sub-01_"),
-        (1, "element_1_"),
         ({"subject": "sub-01"}, "element_sub-01_"),
         ({"subject": 1}, "element_1_"),
         ({"subject": "sub-01", "session": "ses-02"}, "element_sub-01_ses-02_"),
         ({"subject": 1, "session": 2}, "element_1_2_"),
-        (("sub-01", "ses-02"), "element_sub-01_ses-02_"),
-        ((1, 2), "element_1_2_"),
     ],
 )
-def test_element_to_prefix(
+def test_element_to_prefix(element: Dict, prefix: str) -> None:
-    element: Union[str, int, Dict, Tuple], prefix: str
-) -> None:
     """Test converting element to prefix (for file naming).
 
     Parameters
@@ -138,75 +243,5 @@ def test_element_to_prefix(
 def test_element_to_prefix_invalid_type() -> None:
     """Test element to prefix type checking."""
     element = 2.3
-    with pytest.raises(ValueError, match=r"convert element of type"):
+    with pytest.raises(ValueError, match=r"must be a dict"):
         element_to_prefix(element)  # type: ignore
-
-
-def test_element_to_index_check_meta_invalid_key() -> None:
-    """Test element to index metadata key checking."""
-    meta = {"noelement": "foo"}
-    with pytest.raises(ValueError, match=r"metadata must contain the key"):
-        element_to_index(meta)
-
-
-def test_element_to_index() -> None:
-    """Test element to index."""
-    meta = {"element": "foo", "A": 1, "B": [2, 3, 4, 5, 6]}
-    index = element_to_index(meta)
-    assert index.names == ["element", "idx"]
-    assert index.levels[0].name == "element"
-    assert index.levels[0].values[0] == "foo"
-    assert all(x == "foo" for x in index.levels[0].values)
-    assert index.levels[0].values.shape == (1,)
-    assert index.levels[1].name == "idx"
-    assert all(x == i for i, x in enumerate(index.levels[1].values))
-    assert index.levels[1].values.shape == (1,)
-
-    index = element_to_index(meta, n_rows=10)
-    assert index.names == ["element", "idx"]
-    assert index.levels[0].name == "element"
-    assert all(x == "foo" for x in index.levels[0].values)
-    assert index.levels[0].values.shape == (1,)
-
-    assert index.levels[1].name == "idx"
-    assert all(x == i for i, x in enumerate(index.levels[1].values))
-    assert index.levels[1].values.shape == (10,)
-
-    index = element_to_index(meta, n_rows=1, rows_col_name="scan")
-    assert index.names == ["element", "scan"]
-    assert index.levels[0].name == "element"
-    assert index.levels[0].values[0] == "foo"
-    assert all(x == "foo" for x in index.levels[0].values)
-    assert index.levels[0].values.shape == (1,)
-    assert index.levels[1].name == "scan"
-    assert all(x == i for i, x in enumerate(index.levels[1].values))
-    assert index.levels[1].values.shape == (1,)
-
-    index = element_to_index(meta, n_rows=7, rows_col_name="scan")
-    assert index.names == ["element", "scan"]
-    assert index.levels[0].name == "element"
-    assert all(x == "foo" for x in index.levels[0].values)
-    assert index.levels[0].values.shape == (1,)
-
-    assert index.levels[1].name == "scan"
-    assert all(x == i for i, x in enumerate(index.levels[1].values))
-    assert index.levels[1].values.shape == (7,)
-
-    meta = {
-        "element": {"subject": "sub-01", "session": "ses-01"},
-        "A": 1,
-        "B": [2, 3, 4, 5, 6],
-    }
-    index = element_to_index(meta, n_rows=10)
-
-    assert index.levels[0].name == "subject"
-    assert all(x == "sub-01" for x in index.levels[0].values)
-    assert index.levels[0].values.shape == (1,)
-
-    assert index.levels[1].name == "session"
-    assert all(x == "ses-01" for x in index.levels[1].values)
-    assert index.levels[1].values.shape == (1,)
-
-    assert index.levels[2].name == "idx"
-    assert all(x == i for i, x in enumerate(index.levels[2].values))
-    assert index.levels[2].values.shape == (10,)

junifer/storage/utils.py

@@ -6,14 +6,39 @@
 
 import hashlib
 import json
-from typing import Any, Dict, Optional, Tuple, Union
+from importlib.metadata import PackageNotFoundError, version
-
+from typing import Dict, Tuple
-import numpy as np
-import pandas as pd
 
 from ..utils.logging import logger, raise_error
 
 
+def get_dependency_version(dependency: str) -> str:
+    """Get dependency version.
+
+    Parameters
+    ----------
+    dependency : str
+         The dependency to fetch version for.
+
+    Returns
+    -------
+    str
+        The version of the dependency.
+
+    """
+    dep_version = ""
+    try:
+        dep_version = version(dependency)
+    except PackageNotFoundError as e:
+        raise_error(
+            f"Could not obtain the version of {dependency}. "
+            "Have you specified the DEPENDENCIES variable correctly?",
+            exception=e,
+        )
+
+    return dep_version
+
+
 def _meta_hash(meta: Dict) -> str:
     """Compute the MD5 hash of the metadata.
 
@@ -29,6 +54,12 @@ def _meta_hash(meta: Dict) -> str:
 
     """
     logger.debug(f"Hashing metadata: {meta}")
+    if "dependencies" not in meta:
+        raise_error("The metadata must contain the key 'dependencies'")
+    # Convert dependencies set into {dependency: version} dictionary
+    meta["dependencies"] = {
+        dep: get_dependency_version(dep) for dep in meta["dependencies"]
+    }
     meta_md5 = hashlib.md5(
         json.dumps(meta, sort_keys=True).encode("utf-8")
     ).hexdigest()
@@ -36,7 +67,7 @@ def _meta_hash(meta: Dict) -> str:
     return meta_md5
 
 
-def process_meta(meta: Dict) -> Tuple[str, Dict]:
+def process_meta(meta: Dict) -> Tuple[str, Dict, Dict]:
     """Process the metadata for storage.
 
     It removes the key "element" and adds the "_element_keys" with the keys
@@ -53,12 +84,13 @@ def process_meta(meta: Dict) -> Tuple[str, Dict]:
         The MD5 hash of the metadata.
     dict
         The processed metadata for storage.
+    tuple
+        The element.
 
     Raises
     ------
     ValueError
-        If `meta` is None or if it does not contain the key "element" or
+        If `meta` is None or if it does not contain the key "element".
-        "_element_keys".
 
     """
     if meta is None:
@@ -68,97 +100,42 @@ def process_meta(meta: Dict) -> Tuple[str, Dict]:
     # Remove key "element"
     element = t_meta.pop("element", None)
     if element is None:
-        if "_element_keys" not in t_meta:
+        raise_error(msg="`meta` must contain the key 'element'")
-            raise_error(
+    if "marker" not in t_meta:
-                msg="`meta` must contain the key 'element' or '_element_keys'"
+        raise_error(msg="`meta` must contain the key 'marker'")
-            )
+    if "name" not in t_meta["marker"]:
-    else:
+        raise_error(msg="`meta['marker']` must contain the key 'name'")
-        if isinstance(element, dict):
+    if "type" not in t_meta:
-            t_meta["_element_keys"] = list(element.keys())
+        raise_error(msg="`meta` must contain the key 'type'")
-        else:
+
-            t_meta["_element_keys"] = ["element"]
+    t_meta["_element_keys"] = list(element.keys())
+    type_ = t_meta["type"]
+    name = t_meta["marker"]["name"]
+    t_meta["name"] = f"{type_}_{name}"
     # MD5 hash of the metadata
     md5_hash = _meta_hash(t_meta)
-    return md5_hash, t_meta
+    return md5_hash, t_meta, element
 
 
-def element_to_prefix(element: Union[Tuple, Dict, str, int]) -> str:
+def element_to_prefix(element: Dict) -> str:
     """Convert the element metadata to prefix.
 
     Parameters
     ----------
-    element : tuple, dict, str or int
+    element : dict
         The element to convert to prefix.
 
     Returns
     -------
     str
         The element converted to prefix.
-
-    Raises
-    ------
-    ValueError
-        If invalid type is passed for `element`.
-
     """
     logger.debug(f"Converting element {element} to prefix.")
     prefix = "element"
-    if isinstance(element, tuple):
+    if not isinstance(element, dict):
-        prefix = f"{prefix}_{'_'.join([f'{x}' for x in element])}"
+        raise_error(msg="`element` must be a dict")
-    elif isinstance(element, dict):
+
-        prefix = f"{prefix}_{'_'.join([f'{x}' for x in element.values()])}"
+    prefix = f"{prefix}_{'_'.join([f'{x}' for x in element.values()])}"
-    elif isinstance(element, (str, int)):
+
-        prefix = f"{prefix}_{element}"
-    else:
-        raise_error(
-            f"Cannot convert element of type {type(element)} to prefix. "
-            "Must be a str, int, tuple or dict."
-        )
     logger.debug(f"Converted prefix: {prefix}")
     return f"{prefix}_"
-
-
-def element_to_index(
-    meta: Dict, n_rows: int = 1, rows_col_name: Optional[str] = None
-) -> pd.MultiIndex:
-    """Convert the element metadata to index.
-
-    Parameters
-    ----------
-    meta : dict
-        The metadata as a dictionary. Must contain the key "element"."
-    n_rows : int, optional
-        Number of rows to create (default 1).
-    rows_col_name: str, optional
-        The column name to use in case `n_rows` > 1. If None and
-        n_rows > 1, the name will be "idx" (default None).
-
-    Returns
-    -------
-    pandas.MultiIndex
-        The index of the dataframe to store.
-
-    Raises
-    ------
-    ValueError
-        If `meta` does not contain the key "element".
-
-    """
-    if "element" not in meta:
-        raise_error(
-            msg="To create and index, metadata must contain the key 'element'."
-        )
-    # Get element
-    element = meta["element"]
-    if not isinstance(element, dict):
-        element = {"element": element}
-    # Check rows_col_name
-    if rows_col_name is None:
-        rows_col_name = "idx"
-    elem_idx: Dict[Any, Any] = {k: [v] * n_rows for k, v in element.items()}
-    elem_idx[rows_col_name] = np.arange(n_rows)
-    # Create index
-    index = pd.MultiIndex.from_frame(
-        pd.DataFrame(elem_idx, index=range(n_rows))
-    )
-    return index

junifer/testing/registry.py

@@ -10,6 +10,7 @@ from .datagrabbers import (
     SPMAuditoryTestingDatagrabber,
 )
 
+
 # Register testing datagrabber
 register(
     step="datagrabber",

junifer/utils/logging.py

@@ -14,6 +14,7 @@ from warnings import warn
 
 import datalad
 
+
 logger = logging.getLogger("JUNIFER")
 
 # Set up datalad logger level to warning by default
@@ -262,7 +263,11 @@ def configure_logging(
     log_versions()  # log versions of installed packages
 
 
-def raise_error(msg: str, klass: Type[Exception] = ValueError) -> NoReturn:
+def raise_error(
+    msg: str,
+    klass: Type[Exception] = ValueError,
+    exception: Optional[Exception] = None,
+) -> NoReturn:
     """Raise error, but first log it.
 
     Parameters
@@ -271,10 +276,15 @@ def raise_error(msg: str, klass: Type[Exception] = ValueError) -> NoReturn:
         The message for the exception.
     klass : subclass of Exception, optional
         The subclass of Exception to raise using (default ValueError).
+    exception : Exception, optional
+        The original exception to follow up on (default None).
 
     """
     logger.error(msg)
-    raise klass(msg)
+    if exception is not None:
+        raise klass(msg) from exception
+    else:
+        raise klass(msg)
 
 
 def warn_with_log(

pyproject.toml

@@ -11,7 +11,7 @@ name = "junifer"
 description = "JUelich NeuroImaging FEature extractoR"
 readme = "README.md"
 requires-python = ">=3.8"
-license = {file = "LICENSE.md"}
+license = {text = "AGPL-3.0-only"}
 authors = [
     {name = "Fede Raimondo", email = "f.raimondo@fz-juelich.de"},
     {name = "Synchon Mandal", email = "s.mandal@fz-juelich.de"},