Error reading matlab files from Cattan2019_VR

[sylvchev]

There is an issue arising in Cattan2019_VR when reading matlab, but I could not track to what triggered it. I thought it was from h5py new version (above 3.8), but this does not seems to any impact.

There error is:

Unexpected failing examples:
/home/runner/work/moabb/moabb/examples/plot_vr_pc_p300_different_epoch_size.py failed leaving traceback:
Traceback (most recent call last):
  File "/home/runner/work/moabb/moabb/examples/plot_vr_pc_p300_different_epoch_size.py", line 108, in <module>
    X_train, y_train, _ = dataset.get_block_repetition(
  File "/home/runner/work/moabb/moabb/moabb/datasets/braininvaders.py", line 936, in get_block_repetition
    X, labels, meta = paradigm.get_data(self, subjects)
  File "/home/runner/work/moabb/moabb/moabb/paradigms/base.py", line 278, in get_data
    data = [
  File "/home/runner/work/moabb/moabb/moabb/paradigms/base.py", line 279, in <listcomp>
    dataset.get_data(
  File "/home/runner/work/moabb/moabb/moabb/datasets/base.py", line 342, in get_data
    data[subject] = self._get_single_subject_data_using_cache(
  File "/home/runner/work/moabb/moabb/moabb/datasets/base.py", line 436, in _get_single_subject_data_using_cache
    sessions_data = self._get_single_subject_data(subject)
  File "/home/runner/work/moabb/moabb/moabb/datasets/braininvaders.py", line 899, in _get_single_subject_data
    return _bi_get_subject_data(self, subject)
  File "/home/runner/work/moabb/moabb/moabb/datasets/braininvaders.py", line 166, in _bi_get_subject_data
    data = loadmat(os.path.join(file_path, os.listdir(file_path)[0]))["data"]
  File "/home/runner/work/moabb/moabb/.venv/lib/python3.9/site-packages/scipy/io/matlab/_mio.py", line 227, in loadmat
    matfile_dict = MR.get_variables(variable_names)
  File "/home/runner/work/moabb/moabb/.venv/lib/python3.9/site-packages/scipy/io/matlab/_mio5.py", line 332, in get_variables
    res = self.read_var_array(hdr, process)
  File "/home/runner/work/moabb/moabb/.venv/lib/python3.9/site-packages/scipy/io/matlab/_mio5.py", line 292, in read_var_array
    return self._matrix_reader.array_from_header(header, process)
  File "_mio5_utils.pyx", line 666, in scipy.io.matlab._mio5_utils.VarReader5.array_from_header
  File "_mio5_utils.pyx", line 695, in scipy.io.matlab._mio5_utils.VarReader5.array_from_header
  File "_mio5_utils.pyx", line 769, in scipy.io.matlab._mio5_utils.VarReader5.read_real_complex
  File "_mio5_utils.pyx", line 446, in scipy.io.matlab._mio5_utils.VarReader5.read_numeric
  File "_mio5_utils.pyx", line 351, in scipy.io.matlab._mio5_utils.VarReader5.read_element
  File "_streams.pyx", line 171, in scipy.io.matlab._streams.ZlibInputStream.read_string
  File "_streams.pyx", line 164, in scipy.io.matlab._streams.ZlibInputStream.read_into
OSError: could not read bytes

For now, the examples/plot_vr_pc_p300_different_epoch_size.py, examples/plot_phmd_ml_spectrum.py and tutorial_5_build_a_custom_dataset.pyare not built within CI to avoid the error, but we need to find ther source of error and report it to upstream.