@slow_test
def spatio_temporal_cluster_test_connectivity():
    """Test spatio-temporal cluster permutations
    """
    try:
        try:
            from sklearn.feature_extraction.image import grid_to_graph
        except __HOLE__:
            from scikits.learn.feature_extraction.image import grid_to_graph
    except ImportError:
        return
    condition1_1d, condition2_1d, condition1_2d, condition2_2d = \
        _get_conditions()

    rng = np.random.RandomState(0)
    noise1_2d = rng.randn(condition1_2d.shape[0], condition1_2d.shape[1], 10)
    data1_2d = np.transpose(np.dstack((condition1_2d, noise1_2d)), [0, 2, 1])

    noise2_d2 = rng.randn(condition2_2d.shape[0], condition2_2d.shape[1], 10)
    data2_2d = np.transpose(np.dstack((condition2_2d, noise2_d2)), [0, 2, 1])

    conn = grid_to_graph(data1_2d.shape[-1], 1)

    threshold = dict(start=4.0, step=2)
    T_obs, clusters, p_values_conn, hist = \
        spatio_temporal_cluster_test([data1_2d, data2_2d], connectivity=conn,
                                     n_permutations=50, tail=1, seed=1,
                                     threshold=threshold, buffer_size=None)

    buffer_size = data1_2d.size // 10
    T_obs, clusters, p_values_no_conn, hist = \
        spatio_temporal_cluster_test([data1_2d, data2_2d],
                                     n_permutations=50, tail=1, seed=1,
                                     threshold=threshold, n_jobs=2,
                                     buffer_size=buffer_size)

    assert_equal(np.sum(p_values_conn < 0.05), np.sum(p_values_no_conn < 0.05))

    # make sure results are the same without buffer_size
    T_obs, clusters, p_values2, hist2 = \
        spatio_temporal_cluster_test([data1_2d, data2_2d],
                                     n_permutations=50, tail=1, seed=1,
                                     threshold=threshold, n_jobs=2,
                                     buffer_size=None)
    assert_array_equal(p_values_no_conn, p_values2)
dataset/ETHPy150Open mne-tools/mne-python/mne/stats/tests/test_cluster_level.py/spatio_temporal_cluster_test_connectivity