def test_label_binarizer_multilabel():
lb = LabelBinarizer()
inp = [(2, 3), (1, ), (1, 2)]
expected = np.array([[0, 1, 1], [1, 0, 0], [1, 1, 0]])
got = lb.fit_transform(inp)
assert_array_equal(expected, got)
assert_equal(lb.inverse_transform(got), inp)
def test_label_binarizer_multilabel():
lb = LabelBinarizer()
inp = [(2, 3), (1,), (1, 2)]
expected = np.array([[0, 1, 1],
[1, 0, 0],
[1, 1, 0]])
got = lb.fit_transform(inp)
assert_array_equal(expected, got)
assert_equal(lb.inverse_transform(got), inp)
def test_label_binarizer_iris():
lb = LabelBinarizer()
Y = lb.fit_transform(iris.target)
clfs = [SGDClassifier().fit(iris.data, Y[:, k])
for k in range(len(lb.classes_))]
Y_pred = np.array([clf.decision_function(iris.data) for clf in clfs]).T
y_pred = lb.inverse_transform(Y_pred)
accuracy = np.mean(iris.target == y_pred)
y_pred2 = SGDClassifier().fit(iris.data, iris.target).predict(iris.data)
accuracy2 = np.mean(iris.target == y_pred2)
assert_almost_equal(accuracy, accuracy2)
def test_label_binarizer_iris():
lb = LabelBinarizer()
Y = lb.fit_transform(iris.target)
clfs = [SGDClassifier().fit(iris.data, Y[:, k])
for k in range(len(lb.classes_))]
Y_pred = np.array([clf.decision_function(iris.data) for clf in clfs]).T
y_pred = lb.inverse_transform(Y_pred)
accuracy = np.mean(iris.target == y_pred)
y_pred2 = SGDClassifier().fit(iris.data, iris.target).predict(iris.data)
accuracy2 = np.mean(iris.target == y_pred2)
assert_almost_equal(accuracy, accuracy2)
def test_label_binarizer_errors():
"""Check that invalid arguments yield ValueError"""
one_class = np.array([0, 0, 0, 0])
lb = LabelBinarizer().fit(one_class)
multi_label = [(2, 3), (0, ), (0, 2)]
assert_raises(ValueError, lb.transform, multi_label)
def test_label_binarizer():
lb = LabelBinarizer()
# two-class case
inp = np.array([0, 1, 1, 0])
expected = np.array([[0, 1, 1, 0]]).T
got = lb.fit_transform(inp)
assert_array_equal(expected, got)
assert_array_equal(lb.inverse_transform(got), inp)
# multi-class case
inp = np.array([3, 2, 1, 2, 0])
expected = np.array([[0, 0, 0, 1],
[0, 0, 1, 0],
[0, 1, 0, 0],
[0, 0, 1, 0],
[1, 0, 0, 0]])
got = lb.fit_transform(inp)
assert_array_equal(expected, got)
assert_array_equal(lb.inverse_transform(got), inp)
def test_label_binarizer():
lb = LabelBinarizer()
# two-class case
inp = np.array([0, 1, 1, 0])
expected = np.array([[0, 1, 1, 0]]).T
got = lb.fit_transform(inp)
assert_array_equal(expected, got)
assert_array_equal(lb.inverse_transform(got), inp)
# multi-class case
inp = np.array([3, 2, 1, 2, 0])
expected = np.array([[0, 0, 0, 1], [0, 0, 1, 0], [0, 1, 0, 0],
[0, 0, 1, 0], [1, 0, 0, 0]])
got = lb.fit_transform(inp)
assert_array_equal(expected, got)
assert_array_equal(lb.inverse_transform(got), inp)
