Python label.MultiLabelBinarizer类代码示例

def test_multilabel_binarizer_unknown_class():
    mlb = MultiLabelBinarizer()
    y = [[1, 2]]
    assert_raises(KeyError, mlb.fit(y).transform, [[0]])

    mlb = MultiLabelBinarizer(classes=[1, 2])
    assert_raises(KeyError, mlb.fit_transform, [[0]])

def test_multilabel_binarizer_empty_sample():
    mlb = MultiLabelBinarizer()
    y = [[1, 2], [1], []]
    Y = np.array([[1, 1],
                  [1, 0],
                  [0, 0]])
    assert_array_equal(mlb.fit_transform(y), Y)

def test_multilabel_binarizer_given_classes():
    inp = [(2, 3), (1,), (1, 2)]
    indicator_mat = np.array([[0, 1, 1],
                              [1, 0, 0],
                              [1, 0, 1]])
    # fit_transform()
    mlb = MultiLabelBinarizer(classes=[1, 3, 2])
    assert_array_equal(mlb.fit_transform(inp), indicator_mat)
    assert_array_equal(mlb.classes_, [1, 3, 2])

    # fit().transform()
    mlb = MultiLabelBinarizer(classes=[1, 3, 2])
    assert_array_equal(mlb.fit(inp).transform(inp), indicator_mat)
    assert_array_equal(mlb.classes_, [1, 3, 2])

    # ensure works with extra class
    mlb = MultiLabelBinarizer(classes=[4, 1, 3, 2])
    assert_array_equal(mlb.fit_transform(inp),
                       np.hstack(([[0], [0], [0]], indicator_mat)))
    assert_array_equal(mlb.classes_, [4, 1, 3, 2])

    # ensure fit is no-op as iterable is not consumed
    inp = iter(inp)
    mlb = MultiLabelBinarizer(classes=[1, 3, 2])
    assert_array_equal(mlb.fit(inp).transform(inp), indicator_mat)

    # ensure a ValueError is thrown if given duplicate classes
    err_msg = "The classes argument contains duplicate classes. Remove " \
              "these duplicates before passing them to MultiLabelBinarizer."
    mlb = MultiLabelBinarizer(classes=[1, 3, 2, 3])
    assert_raise_message(ValueError, err_msg, mlb.fit, inp)

def test_multilabel_binarizer_unknown_class():
    mlb = MultiLabelBinarizer()
    y = [[1, 2]]
    Y = np.array([[1, 0], [0, 1]])
    w = 'unknown class(es) [0, 4] will be ignored'
    matrix = assert_warns_message(UserWarning, w,
                                  mlb.fit(y).transform, [[4, 1], [2, 0]])
    assert_array_equal(matrix, Y)

    Y = np.array([[1, 0, 0], [0, 1, 0]])
    mlb = MultiLabelBinarizer(classes=[1, 2, 3])
    matrix = assert_warns_message(UserWarning, w,
                                  mlb.fit(y).transform, [[4, 1], [2, 0]])
    assert_array_equal(matrix, Y)

def test_multilabel_binarizer_given_classes():
    inp = [(2, 3), (1,), (1, 2)]
    indicator_mat = np.array([[0, 1, 1],
                              [1, 0, 0],
                              [1, 0, 1]])
    # fit_transform()
    mlb = MultiLabelBinarizer(classes=[1, 3, 2])
    assert_array_equal(mlb.fit_transform(inp), indicator_mat)
    assert_array_equal(mlb.classes_, [1, 3, 2])

    # fit().transform()
    mlb = MultiLabelBinarizer(classes=[1, 3, 2])
    assert_array_equal(mlb.fit(inp).transform(inp), indicator_mat)
    assert_array_equal(mlb.classes_, [1, 3, 2])

    # ensure works with extra class
    mlb = MultiLabelBinarizer(classes=[4, 1, 3, 2])
    assert_array_equal(mlb.fit_transform(inp),
                       np.hstack(([[0], [0], [0]], indicator_mat)))
    assert_array_equal(mlb.classes_, [4, 1, 3, 2])

    # ensure fit is no-op as iterable is not consumed
    inp = iter(inp)
    mlb = MultiLabelBinarizer(classes=[1, 3, 2])
    assert_array_equal(mlb.fit(inp).transform(inp), indicator_mat)

def test_multilabel_binarizer_multiple_calls():
    inp = [(2, 3), (1,), (1, 2)]
    indicator_mat = np.array([[0, 1, 1],
                              [1, 0, 0],
                              [1, 0, 1]])

    indicator_mat2 = np.array([[0, 1, 1],
                               [1, 0, 0],
                               [1, 1, 0]])

    # first call
    mlb = MultiLabelBinarizer(classes=[1, 3, 2])
    assert_array_equal(mlb.fit_transform(inp), indicator_mat)
    # second call change class
    mlb.classes = [1, 2, 3]
    assert_array_equal(mlb.fit_transform(inp), indicator_mat2)

def fit_binarizers(all_values):
    binarizers = {}
    for f in range(len(all_values[0])):
        cur_features = [context[f] for context in all_values]
        # only categorical values need to be binarized, ints/floats are left as they are
        if type(cur_features[0]) == str or type(cur_features[0]) == unicode:
            lb = LabelBinarizer()
            lb.fit(cur_features)
            binarizers[f] = lb
        elif type(cur_features[0]) == list:
            mlb = MultiLabelBinarizer()
            # default feature for unknown values
            cur_features.append(tuple(("__unk__",)))
            mlb.fit([tuple(x) for x in cur_features])
            binarizers[f] = mlb
    return binarizers

def test_multilabel_binarizer_non_integer_labels():
    tuple_classes = np.empty(3, dtype=object)
    tuple_classes[:] = [(1,), (2,), (3,)]
    inputs = [
        ([('2', '3'), ('1',), ('1', '2')], ['1', '2', '3']),
        ([('b', 'c'), ('a',), ('a', 'b')], ['a', 'b', 'c']),
        ([((2,), (3,)), ((1,),), ((1,), (2,))], tuple_classes),
    ]
    indicator_mat = np.array([[0, 1, 1],
                              [1, 0, 0],
                              [1, 1, 0]])
    for inp, classes in inputs:
        # fit_transform()
        mlb = MultiLabelBinarizer()
        assert_array_equal(mlb.fit_transform(inp), indicator_mat)
        assert_array_equal(mlb.classes_, classes)
        assert_array_equal(mlb.inverse_transform(indicator_mat), inp)

        # fit().transform()
        mlb = MultiLabelBinarizer()
        assert_array_equal(mlb.fit(inp).transform(inp), indicator_mat)
        assert_array_equal(mlb.classes_, classes)
        assert_array_equal(mlb.inverse_transform(indicator_mat), inp)

    mlb = MultiLabelBinarizer()
    assert_raises(TypeError, mlb.fit_transform, [({}), ({}, {'a': 'b'})])

def test_multilabel_binarizer():
    # test input as iterable of iterables
    inputs = [
        lambda: [(2, 3), (1,), (1, 2)],
        lambda: ({2, 3}, {1}, {1, 2}),
        lambda: iter([iter((2, 3)), iter((1,)), {1, 2}]),
    ]
    indicator_mat = np.array([[0, 1, 1],
                              [1, 0, 0],
                              [1, 1, 0]])
    inverse = inputs[0]()
    for inp in inputs:
        # With fit_transform
        mlb = MultiLabelBinarizer()
        got = mlb.fit_transform(inp())
        assert_array_equal(indicator_mat, got)
        assert_array_equal([1, 2, 3], mlb.classes_)
        assert_equal(mlb.inverse_transform(got), inverse)

        # With fit
        mlb = MultiLabelBinarizer()
        got = mlb.fit(inp()).transform(inp())
        assert_array_equal(indicator_mat, got)
        assert_array_equal([1, 2, 3], mlb.classes_)
        assert_equal(mlb.inverse_transform(got), inverse)

def test_sparse_output_multilabel_binarizer():
    # test input as iterable of iterables
    inputs = [
        lambda: [(2, 3), (1,), (1, 2)],
        lambda: (set([2, 3]), set([1]), set([1, 2])),
        lambda: iter([iter((2, 3)), iter((1,)), set([1, 2])]),
    ]
    indicator_mat = np.array([[0, 1, 1], [1, 0, 0], [1, 1, 0]])

    inverse = inputs[0]()
    for sparse_output in [True, False]:
        for inp in inputs:
            # With fit_tranform
            mlb = MultiLabelBinarizer(sparse_output=sparse_output)
            got = mlb.fit_transform(inp())
            assert_equal(issparse(got), sparse_output)
            if sparse_output:
                got = got.toarray()
            assert_array_equal(indicator_mat, got)
            assert_array_equal([1, 2, 3], mlb.classes_)
            assert_equal(mlb.inverse_transform(got), inverse)

            # With fit
            mlb = MultiLabelBinarizer(sparse_output=sparse_output)
            got = mlb.fit(inp()).transform(inp())
            assert_equal(issparse(got), sparse_output)
            if sparse_output:
                got = got.toarray()
            assert_array_equal(indicator_mat, got)
            assert_array_equal([1, 2, 3], mlb.classes_)
            assert_equal(mlb.inverse_transform(got), inverse)

    assert_raises(ValueError, mlb.inverse_transform, csr_matrix(np.array([[0, 1, 1], [2, 0, 0], [1, 1, 0]])))

def test_multilabel_binarizer_inverse_validation():
    inp = [(1, 1, 1, 0)]
    mlb = MultiLabelBinarizer()
    mlb.fit_transform(inp)
    # Not binary
    assert_raises(ValueError, mlb.inverse_transform, np.array([[1, 3]]))
    # The following binary cases are fine, however
    mlb.inverse_transform(np.array([[0, 0]]))
    mlb.inverse_transform(np.array([[1, 1]]))
    mlb.inverse_transform(np.array([[1, 0]]))

    # Wrong shape
    assert_raises(ValueError, mlb.inverse_transform, np.array([[1]]))
    assert_raises(ValueError, mlb.inverse_transform, np.array([[1, 1, 1]]))

def test_multilabel_binarizer_same_length_sequence():
    # Ensure sequences of the same length are not interpreted as a 2-d array
    inp = [[1], [0], [2]]
    indicator_mat = np.array([[0, 1, 0], [1, 0, 0], [0, 0, 1]])
    # fit_transform()
    mlb = MultiLabelBinarizer()
    assert_array_equal(mlb.fit_transform(inp), indicator_mat)
    assert_array_equal(mlb.inverse_transform(indicator_mat), inp)

    # fit().transform()
    mlb = MultiLabelBinarizer()
    assert_array_equal(mlb.fit(inp).transform(inp), indicator_mat)
    assert_array_equal(mlb.inverse_transform(indicator_mat), inp)

def test_sparse_output_multilabel_binarizer():
    # test input as iterable of iterables
    inputs = [
        lambda: [(2, 3), (1,), (1, 2)],
        lambda: ({2, 3}, {1}, {1, 2}),
        lambda: iter([iter((2, 3)), iter((1,)), {1, 2}]),
    ]
    indicator_mat = np.array([[0, 1, 1],
                              [1, 0, 0],
                              [1, 1, 0]])

    inverse = inputs[0]()
    for sparse_output in [True, False]:
        for inp in inputs:
            # With fit_transform
            mlb = MultiLabelBinarizer(sparse_output=sparse_output)
            got = mlb.fit_transform(inp())
            assert_equal(issparse(got), sparse_output)
            if sparse_output:
                # verify CSR assumption that indices and indptr have same dtype
                assert_equal(got.indices.dtype, got.indptr.dtype)
                got = got.toarray()
            assert_array_equal(indicator_mat, got)
            assert_array_equal([1, 2, 3], mlb.classes_)
            assert_equal(mlb.inverse_transform(got), inverse)

            # With fit
            mlb = MultiLabelBinarizer(sparse_output=sparse_output)
            got = mlb.fit(inp()).transform(inp())
            assert_equal(issparse(got), sparse_output)
            if sparse_output:
                # verify CSR assumption that indices and indptr have same dtype
                assert_equal(got.indices.dtype, got.indptr.dtype)
                got = got.toarray()
            assert_array_equal(indicator_mat, got)
            assert_array_equal([1, 2, 3], mlb.classes_)
            assert_equal(mlb.inverse_transform(got), inverse)

    assert_raises(ValueError, mlb.inverse_transform,
                  csr_matrix(np.array([[0, 1, 1],
                                       [2, 0, 0],
                                       [1, 1, 0]])))

def test_multilabel_binarizer_non_integer_labels():
    tuple_classes = np.empty(3, dtype=object)
    tuple_classes[:] = [(1,), (2,), (3,)]
    inputs = [
        ([("2", "3"), ("1",), ("1", "2")], ["1", "2", "3"]),
        ([("b", "c"), ("a",), ("a", "b")], ["a", "b", "c"]),
        ([((2,), (3,)), ((1,),), ((1,), (2,))], tuple_classes),
    ]
    indicator_mat = np.array([[0, 1, 1], [1, 0, 0], [1, 1, 0]])
    for inp, classes in inputs:
        # fit_transform()
        mlb = MultiLabelBinarizer()
        assert_array_equal(mlb.fit_transform(inp), indicator_mat)
        assert_array_equal(mlb.classes_, classes)
        assert_array_equal(mlb.inverse_transform(indicator_mat), inp)

        # fit().transform()
        mlb = MultiLabelBinarizer()
        assert_array_equal(mlb.fit(inp).transform(inp), indicator_mat)
        assert_array_equal(mlb.classes_, classes)
        assert_array_equal(mlb.inverse_transform(indicator_mat), inp)

    mlb = MultiLabelBinarizer()
    assert_raises(TypeError, mlb.fit_transform, [({}), ({}, {"a": "b"})])

def test_multilabel_binarizer_non_unique():
    inp = [(1, 1, 1, 0)]
    indicator_mat = np.array([[1, 1]])
    mlb = MultiLabelBinarizer()
    assert_array_equal(mlb.fit_transform(inp), indicator_mat)