Function test_n_components_none

mne/preprocessing/tests/test_ica.py:1377–1401

Test n_components=None.

(method, tmp_path)

@pytest.mark.parametrize("method", ["fastica", "picard"])
def test_n_components_none(method, tmp_path):
    """Test n_components=None."""
    _skip_check_picard(method)
    raw = read_raw_fif(raw_fname).crop(1.5, stop).load_data()
    events = read_events(event_name)
    picks = pick_types(raw.info, eeg=True, meg=False)[::5]
    epochs = Epochs(
        raw, events, event_id, tmin, tmax, picks=picks, baseline=(None, 0), preload=True
    )

    n_components = None
    random_state = 12345

    output_fname = tmp_path / "test_ica-ica.fif"
    ica = ICA(method=method, n_components=n_components, random_state=random_state)
    with _record_warnings():
        ica.fit(epochs)
    _assert_ica_attributes(ica)
    ica.save(output_fname)

    ica = read_ica(output_fname)
    _assert_ica_attributes(ica)
    assert ica.n_pca_components is None
    assert ica.n_components is None
    assert ica.n_components_ == len(picks)


@pytest.mark.slowtest