test_classification.py 文件源码

def test_multilabel_jaccard_similarity_score():
    # Dense label indicator matrix format
    y1 = np.array([[0, 1, 1], [1, 0, 1]])
    y2 = np.array([[0, 0, 1], [1, 0, 1]])

    # size(y1 \inter y2) = [1, 2]
    # size(y1 \union y2) = [2, 2]

    assert_equal(jaccard_similarity_score(y1, y2), 0.75)
    assert_equal(jaccard_similarity_score(y1, y1), 1)
    assert_equal(jaccard_similarity_score(y2, y2), 1)
    assert_equal(jaccard_similarity_score(y2, np.logical_not(y2)), 0)
    assert_equal(jaccard_similarity_score(y1, np.logical_not(y1)), 0)
    assert_equal(jaccard_similarity_score(y1, np.zeros(y1.shape)), 0)
    assert_equal(jaccard_similarity_score(y2, np.zeros(y1.shape)), 0)