including Liu2024 Dataset

.pre-commit-config.yaml

@@ -38,7 +38,7 @@ repos:
     rev: 24.3.0
     hooks:
       - id: black
-        language_version: python3.8
+        language_version: python3
         args: [ --line-length=90, --target-version=py38 ]
 
   -   repo: https://github.com/asottile/blacken-docs

docs/source/dataset_summary.rst

@@ -42,6 +42,7 @@ Motor Imagery
         :class:`Weibo2014`,10,60,7,80,4s,200Hz,1,1,5600
         :class:`Zhou2016`,4,14,3,160,5s,250Hz,3,2,11496
         :class:`Stieger2021`,62,64,4,450,3s,1000Hz,7 or 11,1,250000
+        :class:`Liu2024`,50,29,2,40,4s,500Hz,1,1,160000
 
 P300/ERP
 ======================

docs/source/datasets.rst

@@ -31,7 +31,7 @@ Motor Imagery Datasets
     Weibo2014
     Zhou2016
     Stieger2021
-
+    Liu2024
 
 ------------
 ERP Datasets

docs/source/whats_new.rst

@@ -17,7 +17,7 @@ Develop branch
 
 Enhancements
 ~~~~~~~~~~~~
-- None
+- Add new dataset :class:`moabb.datasets.Liu2024` dataset (:gh:`619` by `Taha Habib`_)
 
 Bugs
 ~~~~
@@ -473,3 +473,4 @@ API changes
 .. _Brian Irvine: https://github.com/brianjohannes
 .. _Bruna Lopes: https://github.com/brunaafl
 .. _Yash Chauhan: https://github.com/jiggychauhi
+.. _Taha Habib: https://github.com/tahatt13

moabb/datasets/__init__.py

@@ -61,6 +61,7 @@
 from .hinss2021 import Hinss2021
 from .huebner_llp import Huebner2017, Huebner2018
 from .Lee2019 import Lee2019_ERP, Lee2019_MI, Lee2019_SSVEP
+from .liu2024 import Liu2024
 from .mpi_mi import MunichMI  # noqa: F401
 from .mpi_mi import GrosseWentrup2009
 from .neiry import DemonsP300

moabb/datasets/liu2024.py

@@ -0,0 +1,310 @@
+"""Liu2024 Motor imagery dataset."""
+
+import os
+import shutil
+import warnings
+import zipfile as z
+from pathlib import Path
+from typing import Any, Dict, Tuple
+
+import mne
+import numpy as np
+import pandas as pd
+from mne.channels import read_custom_montage
+
+from moabb.datasets import download as dl
+from moabb.datasets.base import BaseDataset
+
+
+# Link to the raw data
+LIU2024_URL = "https://figshare.com/ndownloader/files/38516654"
+
+# Links to the electrodes and events information files
+LIU2024_ELECTRODES = "https://figshare.com/ndownloader/files/38516078"
+LIU2024_EVENTS = "https://figshare.com/ndownloader/files/38516084"
+
+
+class Liu2024(BaseDataset):
+    """
+
+    Dataset [1]_ from the study on motor imagery [2]_.
+
+    .. admonition:: Dataset summary
+
+
+        ========= ======== ======= ========== ================= ============ =============== ===========
+        Name      #Subj    #Chan   #Classes   #Trials / class   Trials len   Sampling rate   #Sessions
+        ========= ======== ======= ========== ================= ============ =============== ===========
+        Liu2024   50       29      2          40                4s           500Hz           1
+        ========= ======== ======= ========== ================= ============ =============== ===========
+
+
+    **Dataset description**
+    This dataset includes data from 50 acute stroke patients (the time after stroke ranges from 1 day to 30 days)
+    admitted to the stroke unit of Xuanwu Hospital of Capital Medical University. The patients included 39 males (78%)
+    and 11 females (22%), aged between 31 and 77 years, with an average age of 56.70 years (SD = 10.57)
+    Before the start of the experiment, the subject sat in a chair in a position as comfortable as possible with an
+    EEG cap placed on their head; subjects were positioned approximately 80 cm away from a computer screen in front of them.
+    The computer played audio instructions to the patient about the procedure. Each experiment lasted approximately 20 minutes,
+    including preparation time and approximately 10 minutes of signal recording. Before the start of the MI experiment,
+    the patients opened their eyes and closed their eyes for 1 minute each. The MI experiment was divided into 40 trials, and
+    each trial took 8 seconds, which consisted of three stages (instruction, MI and break). In the instruction stage, patients
+    were prompted to imagine grasping a spherical object with the left- or right-hand. In the MI stage, participants imagined
+    performing this action, a video of gripping motion is played on the computer, which leads the patient imagine grabbing the
+    ball. This video stays playing for 4 s. Patients only imagine one hand movement.In the break stage, participants were allowed
+    to relax and rest. The MI experiments alternated between the left- and right-hand, and the patients moved onto the next stage
+    of the experiment according to the instructions.
+
+    The EEG data were collected through a wireless multichannel EEG acquisition system (ZhenTec NT1, Xi’an ZhenTec Intelligence
+    Technology Co., Ltd., China). The system includes an EEG cap, an EEG acquisition amplifier, a data receiver and host computer
+    software. The EEG cap had electrodes placed according to the international 10-10 system, including 29 EEG recording electrodes
+    and 2 electrooculography (EOG) electrodes. The reference electrode located at CPz position and the grounding electrode located
+    at FPz position. All the EEG electrodes and grounding electrode are Ag/AgCl semi-dry EEG electrodes based on highly absorbable
+    porous sponges that are dampened with 3% NaCl solution. The EOG electrodes are composed by Ag/AgCl electrodes and conductive
+    adhesive hydrogel. The common-mode rejection ratio was 120 dB, the input impedance was 1 GΩ, the input noise was less than
+    0.4 μVrms, and the resolution was 24 bits. The acquisition impedance was less than or equal to 20 kΩ. The sampling frequency
+    was 500 Hz.
+
+    In the dataset, we've removed the 2 EOG channels and we kept the 29 EEG channels and the STIM channel.
+
+    References
+    ----------
+
+    .. [1] Liu, Haijie; Lv, Xiaodong (2022). EEG datasets of stroke patients.
+        figshare. Dataset. DOI: https://doi.org/10.6084/m9.figshare.21679035.v5
+
+    .. [2] Liu, Haijie, Wei, P., Wang, H. et al. An EEG motor imagery dataset
+       for brain computer interface in acute stroke patients. Sci Data 11, 131
+       (2024). DOI: https://doi.org/10.1038/s41597-023-02787-8
+
+    Notes
+    -----
+
+    .. versionadded:: 1.1.1
+
+    """
+
+    def __init__(self):
+        super().__init__(
+            subjects=list(range(1, 50 + 1)),
+            sessions_per_subject=1,
+            events={"left_hand": 1, "right_hand": 2, "instr": 3, "break": 4},
+            code="Liu2024",
+            interval=(2, 6),
+            paradigm="imagery",
+            doi="10.1038/s41597-023-02787-8",
+        )
+
+    def data_path(
+        self, subject, path=None, force_update=False, update_path=None, verbose=None
+    ):
+        """Return the data paths of a single subject.
+
+        Parameters
+        ----------
+        subject : int
+            The subject number to fetch data for.
+        path : None | str
+            Location of where to look for the data storing location. If None,
+            the environment variable or config parameter MNE_(dataset) is used.
+            If it doesn’t exist, the “~/mne_data” directory is used. If the
+            dataset is not found under the given path, the data
+            will be automatically downloaded to the specified folder.
+        force_update : bool
+            Force update of the dataset even if a local copy exists.
+        update_path : bool | None
+            If True, set the MNE_DATASETS_(dataset)_PATH in mne-python config
+            to the given path.
+            If None, the user is prompted.
+        verbose : bool, str, int, or None
+            If not None, override default verbose level (see mne.verbose()).
+
+        Returns
+        -------
+        list
+            A list containing the path to the subject's data file.
+        """
+        if subject not in self.subject_list:
+            raise ValueError("Invalid subject number")
+
+        # Download the zip file containing the data
+        path_zip = dl.data_dl(LIU2024_URL, self.code)
+        path_zip = Path(path_zip)
+        path_folder = path_zip.parent
+
+        # Extract the zip file if it hasn't been extracted yet
+        if not (path_folder / "edffile").is_dir():
+            zip_ref = z.ZipFile(path_zip, "r")
+            zip_ref.extractall(path_folder)
+
+        subject_paths = []
+        sub = f"sub-{subject:02d}"
+
+        # Construct the path to the subject's data file
+        subject_path = (
+            path_folder / "edffile" / sub / "eeg" / f"{sub}_task-motor-imagery_eeg.edf"
+        )
+        subject_paths.append(str(subject_path))
+
+        return subject_paths
+
+    @staticmethod
+    def encoding(events_df: pd.DataFrame) -> Tuple[np.array, Dict[int, str]]:
+        """Encode the columns 'value' and 'trial_type' into a single event type.
+
+        Parameters
+        ----------
+        events_df : pd.DataFrame
+            DataFrame containing the events information.
+
+        Returns
+        -------
+        np.ndarray
+            Array of encoded event types.
+
+        Notes
+        -----
+        The 'trial_type' variable can take the following values:
+         - 1 : Left hand
+         - 2 : Right hand
+
+        The 'value' variable can take the following values:
+         - 1 : instructions
+         - 2 : MI
+         - 3 : break
+
+        """
+        # Define the mapping dictionary
+        encoding_mapping = {
+            (2, 2): 1,  # Left hand, MI
+            (1, 2): 2,  # Right hand, MI
+            (1, 1): 3,  # Right hand, instructions
+            (1, 3): 4,  # Right hand, break
+            (2, 1): 3,  # Left hand, instructions
+            (2, 3): 4,  # Left hand, break
+        }
+
+        mapping = {
+            0: "left_hand",
+            1: "right_hand",
+            2: "instr",
+            3: "break",
+        }
+        # Apply the mapping to the DataFrame
+        event_category = events_df.apply(
+            lambda row: encoding_mapping[(row["trial_type"], row["value"])], axis=1
+        )
+
+        return event_category, mapping
+
+    def _get_single_subject_data(self, subject):
+        """Return the data of a single subject.
+
+        Parameters
+        ----------
+        subject : int
+            The subject number to fetch data for.
+
+        Returns
+        -------
+        dict
+            A dictionary containing the raw data for the subject.
+        """
+
+        file_path_list = self.data_path(subject)[0]
+        path_electrodes, path_events = self.data_infos()
+
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore")
+            # Read the subject's raw data
+            raw = mne.io.read_raw_edf(
+                file_path_list, verbose=False, infer_types=True, stim_channel=""
+            )
+        # Normalize and Read the montage
+        path_electrodes = self._normalize_extension(path_electrodes)
+        # Read and set the montage
+        montage = read_custom_montage(path_electrodes)
+
+        events_df = pd.read_csv(path_events, sep="\t")
+
+        # Encode the events
+        event_category, mapping = self.encoding(events_df=events_df)
+
+        events = self.create_event_array(raw=raw, event_category=event_category)
+
+        # Creating and setting annotations from the events
+        annotations = mne.annotations_from_events(
+            events, sfreq=raw.info["sfreq"], event_desc=mapping
+        )
+
+        raw = raw.set_annotations(annotations)
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore")
+            # Removing the stimulus channels
+            raw = raw.pick(["eeg", "eog"])
+            # Setting the montage
+            raw = raw.set_montage(montage, on_missing="ignore", verbose=False)
+        # Loading dataset
+        raw = raw.load_data(verbose=False)
+        # There is only one session
+        sessions = {"0": {"0": raw}}
+
+        return sessions
+
+    def data_infos(self):
+        """Returns the data paths of the electrodes and events information
+
+        This function downloads the necessary data files for electrodes
+        and events from their respective URLs and returns their local file paths.
+
+        Returns
+        -------
+        tuple
+            A tuple containing the local file paths to the channels, electrodes,
+            and events information files.
+        """
+
+        path_electrodes = dl.data_dl(LIU2024_ELECTRODES, self.code)
+
+        path_events = dl.data_dl(LIU2024_EVENTS, self.code)
+
+        return path_electrodes, path_events
+
+    @staticmethod
+    def _normalize_extension(file_name: str) -> str:
+        # Renaming the .tsv file to make sure it's recognized as .tsv
+        # Check if the file already has the ".tsv" extension
+
+        file_electrodes_tsv = file_name + ".tsv"
+
+        if not os.path.exists(file_electrodes_tsv):
+            # Perform the rename operation only if the target file
+            # doesn't exist
+            shutil.copy(file_name, file_electrodes_tsv)
+
+        return file_electrodes_tsv
+
+    @staticmethod
+    def create_event_array(raw: Any, event_category: np.ndarray) -> np.ndarray:
+        """
+        This method creates an event array based on the stimulus channel.
+
+        Parameters
+        ----------
+        raw : mne.io.Raw
+            The raw data.
+        event_category : np.ndarray
+            The event categories.
+
+        Returns
+        -------
+        events : np.ndarray
+            The created events array.
+        """
+        _, idx_trigger = np.nonzero(raw.copy().pick("").get_data())
+        n_label_stim = len(event_category)
+        # Create the events array based on the stimulus channel
+        events = np.column_stack(
+            (idx_trigger[:n_label_stim], np.zeros_like(event_category), event_category)
+        )
+        return events