def test_random_descent():
# Test that both random and cyclic selection give the same results.
# Ensure that the test models fully converge and check a wide
# range of conditions.
# This uses the coordinate descent algo using the gram trick.
X, y, _, _ = build_dataset(n_samples=50, n_features=20)
clf_cyclic = ElasticNet(selection='cyclic', tol=1e-8)
clf_cyclic.fit(X, y)
clf_random = ElasticNet(selection='random', tol=1e-8, random_state=42)
clf_random.fit(X, y)
assert_array_almost_equal(clf_cyclic.coef_, clf_random.coef_)
assert_almost_equal(clf_cyclic.intercept_, clf_random.intercept_)
# This uses the descent algo without the gram trick
clf_cyclic = ElasticNet(selection='cyclic', tol=1e-8)
clf_cyclic.fit(X.T, y[:20])
clf_random = ElasticNet(selection='random', tol=1e-8, random_state=42)
clf_random.fit(X.T, y[:20])
assert_array_almost_equal(clf_cyclic.coef_, clf_random.coef_)
assert_almost_equal(clf_cyclic.intercept_, clf_random.intercept_)
# Sparse Case
clf_cyclic = ElasticNet(selection='cyclic', tol=1e-8)
clf_cyclic.fit(sparse.csr_matrix(X), y)
clf_random = ElasticNet(selection='random', tol=1e-8, random_state=42)
clf_random.fit(sparse.csr_matrix(X), y)
assert_array_almost_equal(clf_cyclic.coef_, clf_random.coef_)
assert_almost_equal(clf_cyclic.intercept_, clf_random.intercept_)
# Multioutput case.
new_y = np.hstack((y[:, np.newaxis], y[:, np.newaxis]))
clf_cyclic = MultiTaskElasticNet(selection='cyclic', tol=1e-8)
clf_cyclic.fit(X, new_y)
clf_random = MultiTaskElasticNet(selection='random', tol=1e-8,
random_state=42)
clf_random.fit(X, new_y)
assert_array_almost_equal(clf_cyclic.coef_, clf_random.coef_)
assert_almost_equal(clf_cyclic.intercept_, clf_random.intercept_)
# Raise error when selection is not in cyclic or random.
clf_random = ElasticNet(selection='invalid')
assert_raises(ValueError, clf_random.fit, X, y)
def test_correct_RandomProjection_dimensions_embedding():
for RandomProjection in all_RandomProjection:
rp = RandomProjection(n_components='auto', random_state=0,
eps=0.5).fit(data)
# the number of components is adjusted from the shape of the training
# set
assert rp.n_components == 'auto'
assert rp.n_components_ == 110
if RandomProjection in all_SparseRandomProjection:
assert rp.density == 'auto'
assert_almost_equal(rp.density_, 0.03, 2)
assert rp.components_.shape == (110, n_features)
projected_1 = rp.transform(data)
assert projected_1.shape == (n_samples, 110)
# once the RP is 'fitted' the projection is always the same
projected_2 = rp.transform(data)
assert_array_equal(projected_1, projected_2)
# fit transform with same random seed will lead to the same results
rp2 = RandomProjection(random_state=0, eps=0.5)
projected_3 = rp2.fit_transform(data)
assert_array_equal(projected_1, projected_3)
# Try to transform with an input X of size different from fitted.
assert_raises(ValueError, rp.transform, data[:, 1:5])
# it is also possible to fix the number of components and the density
# level
if RandomProjection in all_SparseRandomProjection:
rp = RandomProjection(n_components=100,
density=0.001,
random_state=0)
projected = rp.fit_transform(data)
assert projected.shape == (n_samples, 100)
assert rp.components_.shape == (100, n_features)
assert rp.components_.nnz < 115 # close to 1% density
assert 85 < rp.components_.nnz # close to 1% density
def test_inplace_swap_column():
X = np.array([[0, 3, 0], [2, 4, 0], [0, 0, 0], [9, 8, 7], [4, 0, 5]],
dtype=np.float64)
X_csr = sp.csr_matrix(X)
X_csc = sp.csc_matrix(X)
swap = linalg.get_blas_funcs(('swap', ), (X, ))
swap = swap[0]
X[:, 0], X[:, -1] = swap(X[:, 0], X[:, -1])
inplace_swap_column(X_csr, 0, -1)
inplace_swap_column(X_csc, 0, -1)
assert_array_equal(X_csr.toarray(), X_csc.toarray())
assert_array_equal(X, X_csc.toarray())
assert_array_equal(X, X_csr.toarray())
X[:, 0], X[:, 1] = swap(X[:, 0], X[:, 1])
inplace_swap_column(X_csr, 0, 1)
inplace_swap_column(X_csc, 0, 1)
assert_array_equal(X_csr.toarray(), X_csc.toarray())
assert_array_equal(X, X_csc.toarray())
assert_array_equal(X, X_csr.toarray())
assert_raises(TypeError, inplace_swap_column, X_csr.tolil())
X = np.array([[0, 3, 0], [2, 4, 0], [0, 0, 0], [9, 8, 7], [4, 0, 5]],
dtype=np.float32)
X_csr = sp.csr_matrix(X)
X_csc = sp.csc_matrix(X)
swap = linalg.get_blas_funcs(('swap', ), (X, ))
swap = swap[0]
X[:, 0], X[:, -1] = swap(X[:, 0], X[:, -1])
inplace_swap_column(X_csr, 0, -1)
inplace_swap_column(X_csc, 0, -1)
assert_array_equal(X_csr.toarray(), X_csc.toarray())
assert_array_equal(X, X_csc.toarray())
assert_array_equal(X, X_csr.toarray())
X[:, 0], X[:, 1] = swap(X[:, 0], X[:, 1])
inplace_swap_column(X_csr, 0, 1)
inplace_swap_column(X_csc, 0, 1)
assert_array_equal(X_csr.toarray(), X_csc.toarray())
assert_array_equal(X, X_csc.toarray())
assert_array_equal(X, X_csr.toarray())
assert_raises(TypeError, inplace_swap_column, X_csr.tolil())
def test_ransac_max_trials():
base_estimator = LinearRegression()
ransac_estimator = RANSACRegressor(base_estimator,
min_samples=2,
residual_threshold=5,
max_trials=0,
random_state=0)
assert_raises(ValueError, ransac_estimator.fit, X, y)
# there is a 1e-9 chance it will take these many trials. No good reason
# 1e-2 isn't enough, can still happen
# 2 is the what ransac defines as min_samples = X.shape[1] + 1
max_trials = _dynamic_max_trials(
len(X) - len(outliers), X.shape[0], 2, 1 - 1e-9)
ransac_estimator = RANSACRegressor(base_estimator, min_samples=2)
for i in range(50):
ransac_estimator.set_params(min_samples=2, random_state=i)
ransac_estimator.fit(X, y)
assert ransac_estimator.n_trials_ < max_trials + 1
def test_config_context():
assert get_config() == {'assume_finite': False, 'working_memory': 1024,
'print_changed_only': True}
# Not using as a context manager affects nothing
config_context(assume_finite=True)
assert get_config()['assume_finite'] is False
with config_context(assume_finite=True):
assert get_config() == {'assume_finite': True, 'working_memory': 1024,
'print_changed_only': True}
assert get_config()['assume_finite'] is False
with config_context(assume_finite=True):
with config_context(assume_finite=None):
assert get_config()['assume_finite'] is True
assert get_config()['assume_finite'] is True
with config_context(assume_finite=False):
assert get_config()['assume_finite'] is False
with config_context(assume_finite=None):
assert get_config()['assume_finite'] is False
# global setting will not be retained outside of context that
# did not modify this setting
set_config(assume_finite=True)
assert get_config()['assume_finite'] is True
assert get_config()['assume_finite'] is False
assert get_config()['assume_finite'] is True
assert get_config() == {'assume_finite': False, 'working_memory': 1024,
'print_changed_only': True}
# No positional arguments
assert_raises(TypeError, config_context, True)
# No unknown arguments
assert_raises(TypeError, config_context(do_something_else=True).__enter__)
def test_bagging_classifier_with_missing_inputs():
# Check that SerialBaggingClassifier can accept X with missing/infinite data
X = np.array([[1, 3, 5], [2, None, 6], [2, np.nan, 6], [2, np.inf, 6],
[2, np.NINF, 6]])
y = np.array([3, 6, 6, 6, 6])
classifier = DecisionTreeClassifier()
pipeline = make_pipeline(FunctionTransformer(replace), classifier)
pipeline.fit(X, y).predict(X)
bagging_classifier = SerialBaggingClassifier(pipeline)
bagging_classifier.fit(X, y)
y_hat = bagging_classifier.predict(X)
assert y.shape == y_hat.shape
bagging_classifier.predict_log_proba(X)
bagging_classifier.predict_proba(X)
# Verify that exceptions can be raised by wrapper classifier
classifier = DecisionTreeClassifier()
pipeline = make_pipeline(classifier)
assert_raises(ValueError, pipeline.fit, X, y)
bagging_classifier = SerialBaggingClassifier(pipeline)
assert_raises(ValueError, bagging_classifier.fit, X, y)
def test_transformation_dimensions():
X = np.arange(12).reshape(4, 3)
y = [1, 1, 2, 2]
# Fail if transformation input dimension does not match inputs dimensions
transformation = np.array([[1, 2], [3, 4]])
assert_raises(ValueError,
NeighborhoodComponentsAnalysis(init=transformation).fit, X,
y)
# Fail if transformation output dimension is larger than
# transformation input dimension
transformation = np.array([[1, 2], [3, 4], [5, 6]])
# len(transformation) > len(transformation[0])
assert_raises(ValueError,
NeighborhoodComponentsAnalysis(init=transformation).fit, X,
y)
# Pass otherwise
transformation = np.arange(9).reshape(3, 3)
NeighborhoodComponentsAnalysis(init=transformation).fit(X, y)
def test_discretenb_input_check_partial_fit(cls):
# check shape consistency
assert_raises(ValueError,
cls().partial_fit,
X2,
y2[:-1],
classes=np.unique(y2))
# classes is required for first call to partial fit
assert_raises(ValueError, cls().partial_fit, X2, y2)
# check consistency of consecutive classes values
clf = cls()
clf.partial_fit(X2, y2, classes=np.unique(y2))
assert_raises(ValueError, clf.partial_fit, X2, y2, classes=np.arange(42))
# check consistency of input shape for partial_fit
assert_raises(ValueError, clf.partial_fit, X2[:, :-1], y2)
# check consistency of input shape for predict
assert_raises(ValueError, clf.predict, X2[:, :-1])
def test_features_zero_var():
# Test that features with 0 variance throw error
X = np.empty((10, 2))
X[:, 0] = -0.13725701
X[:, 1] = -0.9853293
y = np.zeros((10))
y[0] = 1
clf = NearestCentroid(shrink_threshold=0.1)
with assert_raises(ValueError):
clf.fit(X, y)
def test_column_or_1d():
EXAMPLES = [
("binary", ["spam", "egg", "spam"]),
("binary", [0, 1, 0, 1]),
("continuous", np.arange(10) / 20.),
("multiclass", [1, 2, 3]),
("multiclass", [0, 1, 2, 2, 0]),
("multiclass", [[1], [2], [3]]),
("multilabel-indicator", [[0, 1, 0], [0, 0, 1]]),
("multiclass-multioutput", [[1, 2, 3]]),
("multiclass-multioutput", [[1, 1], [2, 2], [3, 1]]),
("multiclass-multioutput", [[5, 1], [4, 2], [3, 1]]),
("multiclass-multioutput", [[1, 2, 3]]),
("continuous-multioutput", np.arange(30).reshape((-1, 3))),
]
for y_type, y in EXAMPLES:
if y_type in ["binary", 'multiclass', "continuous"]:
assert_array_equal(column_or_1d(y), np.ravel(y))
else:
assert_raises(ValueError, column_or_1d, y)
def test_lasso_lars_ic():
# Test the LassoLarsIC object by checking that
# - some good features are selected.
# - alpha_bic > alpha_aic
# - n_nonzero_bic < n_nonzero_aic
lars_bic = linear_model.LassoLarsIC('bic')
lars_aic = linear_model.LassoLarsIC('aic')
rng = np.random.RandomState(42)
X = diabetes.data
X = np.c_[X, rng.randn(X.shape[0], 5)] # add 5 bad features
lars_bic.fit(X, y)
lars_aic.fit(X, y)
nonzero_bic = np.where(lars_bic.coef_)[0]
nonzero_aic = np.where(lars_aic.coef_)[0]
assert lars_bic.alpha_ > lars_aic.alpha_
assert len(nonzero_bic) < len(nonzero_aic)
assert np.max(nonzero_bic) < diabetes.data.shape[1]
# test error on unknown IC
lars_broken = linear_model.LassoLarsIC('<unknown>')
assert_raises(ValueError, lars_broken.fit, X, y)
def test_clone_buggy():
# Check that clone raises an error on buggy estimators.
buggy = Buggy()
buggy.a = 2
assert_raises(RuntimeError, clone, buggy)
no_estimator = NoEstimator()
assert_raises(TypeError, clone, no_estimator)
varg_est = VargEstimator()
assert_raises(RuntimeError, clone, varg_est)
est = ModifyInitParams()
assert_raises(RuntimeError, clone, est)
def test_plot_partial_dependence_multiclass(pyplot):
# Test partial dependence plot function on multi-class input.
clf = GradientBoostingClassifier(n_estimators=10, random_state=1)
clf.fit(iris.data, iris.target)
grid_resolution = 25
fig, axs = plot_partial_dependence(clf,
iris.data, [0, 1],
label=0,
grid_resolution=grid_resolution)
assert len(axs) == 2
assert all(ax.has_data for ax in axs)
# now with symbol labels
target = iris.target_names[iris.target]
clf = GradientBoostingClassifier(n_estimators=10, random_state=1)
clf.fit(iris.data, target)
grid_resolution = 25
fig, axs = plot_partial_dependence(clf,
iris.data, [0, 1],
label='setosa',
grid_resolution=grid_resolution)
assert len(axs) == 2
assert all(ax.has_data for ax in axs)
# label not in gbrt.classes_
assert_raises(ValueError,
plot_partial_dependence,
clf,
iris.data, [0, 1],
label='foobar',
grid_resolution=grid_resolution)
# label not provided
assert_raises(ValueError,
plot_partial_dependence,
clf,
iris.data, [0, 1],
grid_resolution=grid_resolution)
def test_ransac_dynamic_max_trials():
# Numbers hand-calculated and confirmed on page 119 (Table 4.3) in
# Hartley, R.~I. and Zisserman, A., 2004,
# Multiple View Geometry in Computer Vision, Second Edition,
# Cambridge University Press, ISBN: 0521540518
# e = 0%, min_samples = X
assert _dynamic_max_trials(100, 100, 2, 0.99) == 1
# e = 5%, min_samples = 2
assert _dynamic_max_trials(95, 100, 2, 0.99) == 2
# e = 10%, min_samples = 2
assert _dynamic_max_trials(90, 100, 2, 0.99) == 3
# e = 30%, min_samples = 2
assert _dynamic_max_trials(70, 100, 2, 0.99) == 7
# e = 50%, min_samples = 2
assert _dynamic_max_trials(50, 100, 2, 0.99) == 17
# e = 5%, min_samples = 8
assert _dynamic_max_trials(95, 100, 8, 0.99) == 5
# e = 10%, min_samples = 8
assert _dynamic_max_trials(90, 100, 8, 0.99) == 9
# e = 30%, min_samples = 8
assert _dynamic_max_trials(70, 100, 8, 0.99) == 78
# e = 50%, min_samples = 8
assert _dynamic_max_trials(50, 100, 8, 0.99) == 1177
# e = 0%, min_samples = 10
assert _dynamic_max_trials(1, 100, 10, 0) == 0
assert _dynamic_max_trials(1, 100, 10, 1) == float('inf')
base_estimator = LinearRegression()
ransac_estimator = RANSACRegressor(base_estimator,
min_samples=2,
stop_probability=-0.1)
assert_raises(ValueError, ransac_estimator.fit, X, y)
ransac_estimator = RANSACRegressor(base_estimator,
min_samples=2,
stop_probability=1.1)
assert_raises(ValueError, ransac_estimator.fit, X, y)
def test_ransac_min_n_samples():
base_estimator = LinearRegression()
ransac_estimator1 = RANSACRegressor(base_estimator, min_samples=2,
residual_threshold=5, random_state=0)
ransac_estimator2 = RANSACRegressor(base_estimator,
min_samples=2. / X.shape[0],
residual_threshold=5, random_state=0)
ransac_estimator3 = RANSACRegressor(base_estimator, min_samples=-1,
residual_threshold=5, random_state=0)
ransac_estimator4 = RANSACRegressor(base_estimator, min_samples=5.2,
residual_threshold=5, random_state=0)
ransac_estimator5 = RANSACRegressor(base_estimator, min_samples=2.0,
residual_threshold=5, random_state=0)
ransac_estimator6 = RANSACRegressor(base_estimator,
residual_threshold=5, random_state=0)
ransac_estimator7 = RANSACRegressor(base_estimator,
min_samples=X.shape[0] + 1,
residual_threshold=5, random_state=0)
ransac_estimator1.fit(X, y)
ransac_estimator2.fit(X, y)
ransac_estimator5.fit(X, y)
ransac_estimator6.fit(X, y)
assert_array_almost_equal(ransac_estimator1.predict(X),
ransac_estimator2.predict(X))
assert_array_almost_equal(ransac_estimator1.predict(X),
ransac_estimator5.predict(X))
assert_array_almost_equal(ransac_estimator1.predict(X),
ransac_estimator6.predict(X))
assert_raises(ValueError, ransac_estimator3.fit, X, y)
assert_raises(ValueError, ransac_estimator4.fit, X, y)
assert_raises(ValueError, ransac_estimator7.fit, X, y)
def test_multi_output_exceptions():
# NotFittedError when fit is not done but score, predict and
# and predict_proba are called
moc = MultiOutputClassifier(LinearSVC(random_state=0))
assert_raises(NotFittedError, moc.predict, y)
assert_raises(NotFittedError, moc.predict_proba, y)
assert_raises(NotFittedError, moc.score, X, y)
# ValueError when number of outputs is different
# for fit and score
y_new = np.column_stack((y1, y2))
moc.fit(X, y)
assert_raises(ValueError, moc.score, X, y_new)
# ValueError when y is continuous
assert_raise_message(ValueError, "Unknown label type", moc.fit, X, X[:, 1])
def check_min_samples_split(name):
X, y = hastie_X, hastie_y
ForestEstimator = FOREST_ESTIMATORS[name]
# test boundary value
assert_raises(ValueError, ForestEstimator(min_samples_split=-1).fit, X, y)
assert_raises(ValueError, ForestEstimator(min_samples_split=0).fit, X, y)
assert_raises(ValueError, ForestEstimator(min_samples_split=1.1).fit, X, y)
est = ForestEstimator(min_samples_split=10, n_estimators=1, random_state=0)
est.fit(X, y)
node_idx = est.estimators_[0].tree_.children_left != -1
node_samples = est.estimators_[0].tree_.n_node_samples[node_idx]
assert np.min(node_samples) > len(X) * 0.5 - 1, (
"Failed with {0}".format(name))
est = ForestEstimator(min_samples_split=0.5,
n_estimators=1,
random_state=0)
est.fit(X, y)
node_idx = est.estimators_[0].tree_.children_left != -1
node_samples = est.estimators_[0].tree_.n_node_samples[node_idx]
assert np.min(node_samples) > len(X) * 0.5 - 1, (
"Failed with {0}".format(name))
def test_unique_labels():
# Empty iterable
assert_raises(ValueError, unique_labels)
# Multiclass problem
assert_array_equal(unique_labels(range(10)), np.arange(10))
assert_array_equal(unique_labels(np.arange(10)), np.arange(10))
assert_array_equal(unique_labels([4, 0, 2]), np.array([0, 2, 4]))
# Multilabel indicator
assert_array_equal(unique_labels(np.array([[0, 0, 1],
[1, 0, 1],
[0, 0, 0]])),
np.arange(3))
assert_array_equal(unique_labels(np.array([[0, 0, 1],
[0, 0, 0]])),
np.arange(3))
# Several arrays passed
assert_array_equal(unique_labels([4, 0, 2], range(5)),
np.arange(5))
assert_array_equal(unique_labels((0, 1, 2), (0,), (2, 1)),
np.arange(3))
# Border line case with binary indicator matrix
assert_raises(ValueError, unique_labels, [4, 0, 2], np.ones((5, 5)))
assert_raises(ValueError, unique_labels, np.ones((5, 4)), np.ones((5, 5)))
assert_array_equal(unique_labels(np.ones((4, 5)), np.ones((5, 5))),
np.arange(5))
def test_sparse_random_projection_transformer_invalid_density():
for RandomProjection in all_SparseRandomProjection:
assert_raises(ValueError, RandomProjection(density=1.1).fit, data)
assert_raises(ValueError, RandomProjection(density=0).fit, data)
assert_raises(ValueError, RandomProjection(density=-0.1).fit, data)
def test_bagging_regressor_with_missing_inputs():
# Check that SerialBaggingRegressor can accept X with missing/infinite data
X = np.array([[1, 3, 5], [2, None, 6], [2, np.nan, 6], [2, np.inf, 6],
[2, np.NINF, 6]])
y_values = [
np.array([2, 3, 3, 3, 3]),
np.array([[2, 1, 9], [3, 6, 8], [3, 6, 8], [3, 6, 8], [3, 6, 8]]),
]
for y in y_values:
regressor = DecisionTreeRegressor()
pipeline = make_pipeline(FunctionTransformer(replace), regressor)
pipeline.fit(X, y).predict(X)
bagging_regressor = SerialBaggingRegressor(pipeline)
y_hat = bagging_regressor.fit(X, y).predict(X)
assert y.shape == y_hat.shape
# Verify that exceptions can be raised by wrapper regressor
regressor = DecisionTreeRegressor()
pipeline = make_pipeline(regressor)
assert_raises(ValueError, pipeline.fit, X, y)
bagging_regressor = SerialBaggingRegressor(pipeline)
assert_raises(ValueError, bagging_regressor.fit, X, y)
def test_skewed_chi2_sampler():
# test that RBFSampler approximates kernel on random data
# compute exact kernel
c = 0.03
# set on negative component but greater than c to ensure that the kernel
# approximation is valid on the group (-c; +\infty) endowed with the skewed
# multiplication.
Y[0, 0] = -c / 2.
# abbreviations for easier formula
X_c = (X + c)[:, np.newaxis, :]
Y_c = (Y + c)[np.newaxis, :, :]
# we do it in log-space in the hope that it's more stable
# this array is n_samples_x x n_samples_y big x n_features
log_kernel = ((np.log(X_c) / 2.) + (np.log(Y_c) / 2.) + np.log(2.) -
np.log(X_c + Y_c))
# reduce to n_samples_x x n_samples_y by summing over features in log-space
kernel = np.exp(log_kernel.sum(axis=2))
# approximate kernel mapping
transform = SkewedChi2Sampler(skewedness=c,
n_components=1000,
random_state=42)
X_trans = transform.fit_transform(X)
Y_trans = transform.transform(Y)
kernel_approx = np.dot(X_trans, Y_trans.T)
assert_array_almost_equal(kernel, kernel_approx, 1)
assert np.isfinite(kernel).all(), \
'NaNs found in the Gram matrix'
assert np.isfinite(kernel_approx).all(), \
'NaNs found in the approximate Gram matrix'
# test error is raised on when inputs contains values smaller than -c
Y_neg = Y.copy()
Y_neg[0, 0] = -c * 2.
assert_raises(ValueError, transform.transform, Y_neg)
def test_min_max_axis_errors():
X = np.array([[0, 3, 0], [2, -1, 0], [0, 0, 0], [9, 8, 7], [4, 0, 5]],
dtype=np.float64)
X_csr = sp.csr_matrix(X)
X_csc = sp.csc_matrix(X)
assert_raises(TypeError, min_max_axis, X_csr.tolil(), axis=0)
assert_raises(ValueError, min_max_axis, X_csr, axis=2)
assert_raises(ValueError, min_max_axis, X_csc, axis=-3)
def test_callback(capsys):
X = iris_data
y = iris_target
nca = NeighborhoodComponentsAnalysis(callback='my_cb')
assert_raises(ValueError, nca.fit, X, y)
max_iter = 10
def my_cb(transformation, n_iter):
assert transformation.shape == (iris_data.shape[1]**2, )
rem_iter = max_iter - n_iter
print('{} iterations remaining...'.format(rem_iter))
# assert that my_cb is called
nca = NeighborhoodComponentsAnalysis(max_iter=max_iter,
callback=my_cb,
verbose=1)
nca.fit(iris_data, iris_target)
out, _ = capsys.readouterr()
# check output
assert ('{} iterations remaining...'.format(max_iter - 1) in out)
def test_params_validation():
# Test that invalid parameters raise value error
X = np.arange(12).reshape(4, 3)
y = [1, 1, 2, 2]
NCA = NeighborhoodComponentsAnalysis
rng = np.random.RandomState(42)
# TypeError
assert_raises(TypeError, NCA(max_iter='21').fit, X, y)
assert_raises(TypeError, NCA(verbose='true').fit, X, y)
assert_raises(TypeError, NCA(tol='1').fit, X, y)
assert_raises(TypeError, NCA(n_components='invalid').fit, X, y)
assert_raises(TypeError, NCA(warm_start=1).fit, X, y)
# ValueError
assert_raise_message(
ValueError, "`init` must be 'auto', 'pca', 'lda', 'identity', "
"'random' or a numpy array of shape "
"(n_components, n_features).",
NCA(init=1).fit, X, y)
assert_raise_message(ValueError, '`max_iter`= -1, must be >= 1.',
NCA(max_iter=-1).fit, X, y)
init = rng.rand(5, 3)
assert_raise_message(
ValueError, 'The output dimensionality ({}) of the given linear '
'transformation `init` cannot be greater than its '
'input dimensionality ({}).'.format(init.shape[0], init.shape[1]),
NCA(init=init).fit, X, y)
n_components = 10
assert_raise_message(
ValueError, 'The preferred dimensionality of the '
'projected space `n_components` ({}) cannot '
'be greater than the given data '
'dimensionality ({})!'.format(n_components, X.shape[1]),
NCA(n_components=n_components).fit, X, y)
def test_calibration_curve():
"""Check calibration_curve function"""
y_true = np.array([0, 0, 0, 1, 1, 1])
y_pred = np.array([0., 0.1, 0.2, 0.8, 0.9, 1.])
prob_true, prob_pred = calibration_curve(y_true, y_pred, n_bins=2)
prob_true_unnormalized, prob_pred_unnormalized = \
calibration_curve(y_true, y_pred * 2, n_bins=2, normalize=True)
assert len(prob_true) == len(prob_pred)
assert len(prob_true) == 2
assert_almost_equal(prob_true, [0, 1])
assert_almost_equal(prob_pred, [0.1, 0.9])
assert_almost_equal(prob_true, prob_true_unnormalized)
assert_almost_equal(prob_pred, prob_pred_unnormalized)
# probabilities outside [0, 1] should not be accepted when normalize
# is set to False
assert_raises(ValueError,
calibration_curve, [1.1], [-0.1],
normalize=False)
# test that quantiles work as expected
y_true2 = np.array([0, 0, 0, 0, 1, 1])
y_pred2 = np.array([0., 0.1, 0.2, 0.5, 0.9, 1.])
prob_true_quantile, prob_pred_quantile = calibration_curve(
y_true2, y_pred2, n_bins=2, strategy='quantile')
assert len(prob_true_quantile) == len(prob_pred_quantile)
assert len(prob_true_quantile) == 2
assert_almost_equal(prob_true_quantile, [0, 2 / 3])
assert_almost_equal(prob_pred_quantile, [0.1, 0.8])
# Check that error is raised when invalid strategy is selected
assert_raises(ValueError,
calibration_curve,
y_true2,
y_pred2,
strategy='percentile')
def test_set_pipeline_steps():
transf1 = Transf()
transf2 = Transf()
pipeline = Pipeline([('mock', transf1)])
assert pipeline.named_steps['mock'] is transf1
# Directly setting attr
pipeline.steps = [('mock2', transf2)]
assert 'mock' not in pipeline.named_steps
assert pipeline.named_steps['mock2'] is transf2
assert [('mock2', transf2)] == pipeline.steps
# Using set_params
pipeline.set_params(steps=[('mock', transf1)])
assert [('mock', transf1)] == pipeline.steps
# Using set_params to replace single step
pipeline.set_params(mock=transf2)
assert [('mock', transf2)] == pipeline.steps
# With invalid data
pipeline.set_params(steps=[('junk', ())])
assert_raises(TypeError, pipeline.fit, [[1]], [1])
assert_raises(TypeError, pipeline.fit_transform, [[1]], [1])
def test_ridge_individual_penalties():
# Tests the ridge object using individual penalties
rng = np.random.RandomState(42)
n_samples, n_features, n_targets = 20, 10, 5
X = rng.randn(n_samples, n_features)
y = rng.randn(n_samples, n_targets)
penalties = np.arange(n_targets)
coef_cholesky = np.array([
Ridge(alpha=alpha, solver="cholesky").fit(X, target).coef_
for alpha, target in zip(penalties, y.T)])
coefs_indiv_pen = [
Ridge(alpha=penalties, solver=solver, tol=1e-8).fit(X, y).coef_
for solver in ['svd', 'sparse_cg', 'lsqr', 'cholesky', 'sag', 'saga']]
for coef_indiv_pen in coefs_indiv_pen:
assert_array_almost_equal(coef_cholesky, coef_indiv_pen)
# Test error is raised when number of targets and penalties do not match.
ridge = Ridge(alpha=penalties[:-1])
assert_raises(ValueError, ridge.fit, X, y)
def test_qda():
# QDA classification.
# This checks that QDA implements fit and predict and returns
# correct values for a simple toy dataset.
clf = QuadraticDiscriminantAnalysis()
y_pred = clf.fit(X6, y6).predict(X6)
assert_array_equal(y_pred, y6)
# Assure that it works with 1D data
y_pred1 = clf.fit(X7, y6).predict(X7)
assert_array_equal(y_pred1, y6)
# Test probas estimates
y_proba_pred1 = clf.predict_proba(X7)
assert_array_equal((y_proba_pred1[:, 1] > 0.5) + 1, y6)
y_log_proba_pred1 = clf.predict_log_proba(X7)
assert_array_almost_equal(np.exp(y_log_proba_pred1), y_proba_pred1, 8)
y_pred3 = clf.fit(X6, y7).predict(X6)
# QDA shouldn't be able to separate those
assert np.any(y_pred3 != y7)
# Classes should have at least 2 elements
assert_raises(ValueError, clf.fit, X6, y4)
def check_edge_case_of_sample_int(sample_without_replacement):
# n_population < n_sample
assert_raises(ValueError, sample_without_replacement, 0, 1)
assert_raises(ValueError, sample_without_replacement, 1, 2)
# n_population == n_samples
assert sample_without_replacement(0, 0).shape == (0, )
assert sample_without_replacement(1, 1).shape == (1, )
# n_population >= n_samples
assert sample_without_replacement(5, 0).shape == (0, )
assert sample_without_replacement(5, 1).shape == (1, )
# n_population < 0 or n_samples < 0
assert_raises(ValueError, sample_without_replacement, -1, 5)
assert_raises(ValueError, sample_without_replacement, 5, -1)
def test_ovr_exceptions():
ovr = OneVsRestClassifier(LinearSVC(random_state=0))
assert_raises(ValueError, ovr.predict, [])
# Fail on multioutput data
assert_raises(ValueError, OneVsRestClassifier(MultinomialNB()).fit,
np.array([[1, 0], [0, 1]]),
np.array([[1, 2], [3, 1]]))
assert_raises(ValueError, OneVsRestClassifier(MultinomialNB()).fit,
np.array([[1, 0], [0, 1]]),
np.array([[1.5, 2.4], [3.1, 0.8]]))
