def test_multi_pca_score():
shape = (6, 8, 10, 5)
affine = np.eye(4)
rng = np.random.RandomState(0)
# Create a "multi-subject" dataset
imgs = []
for i in range(8):
this_img = rng.normal(size=shape)
imgs.append(nibabel.Nifti1Image(this_img, affine))
mask_img = nibabel.Nifti1Image(np.ones(shape[:3], dtype=np.int8), affine)
# Assert that score is between zero and one
multi_pca = MultiPCA(mask=mask_img,
random_state=0,
memory_level=0,
n_components=3)
multi_pca.fit(imgs)
s = multi_pca.score(imgs)
assert_true(np.all(s <= 1))
assert_true(np.all(0 <= s))
# Assert that score does not fail with single subject data
multi_pca = MultiPCA(mask=mask_img,
random_state=0,
memory_level=0,
n_components=3)
multi_pca.fit(imgs[0])
s = multi_pca.score(imgs[0])
assert_true(isinstance(s, float))
assert (0. <= s <= 1.)
# Assert that score is one for n_components == n_sample
# in single subject configuration
multi_pca = MultiPCA(mask=mask_img,
random_state=0,
memory_level=0,
n_components=5)
multi_pca.fit(imgs[0])
s = multi_pca.score(imgs[0])
assert_almost_equal(s, 1., 1)
# Per component score
multi_pca = MultiPCA(mask=mask_img,
random_state=0,
memory_level=0,
n_components=5)
multi_pca.fit(imgs[0])
masker = NiftiMasker(mask_img).fit()
s = multi_pca._raw_score(masker.transform(imgs[0]), per_component=True)
assert_equal(s.shape, (5, ))
assert_true(np.all(s <= 1))
assert_true(np.all(0 <= s))
def test_multi_pca():
# Smoke test the MultiPCA
# XXX: this is mostly a smoke test
shape = (6, 8, 10, 5)
affine = np.eye(4)
rng = np.random.RandomState(0)
# Create a "multi-subject" dataset
data = []
for i in range(8):
this_data = rng.normal(size=shape)
# Create fake activation to get non empty mask
this_data[2:4, 2:4, 2:4, :] += 10
data.append(nibabel.Nifti1Image(this_data, affine))
mask_img = nibabel.Nifti1Image(np.ones(shape[:3], dtype=np.int8), affine)
multi_pca = MultiPCA(mask=mask_img, n_components=3, random_state=0)
# Test that the components are the same if we put twice the same data, and
# that fit output is deterministic
components1 = multi_pca.fit(data).components_
components2 = multi_pca.fit(data).components_
components3 = multi_pca.fit(2 * data).components_
np.testing.assert_array_equal(components1, components2)
np.testing.assert_array_almost_equal(components1, components3)
# Smoke test fit with 'confounds' argument
confounds = [np.arange(10).reshape(5, 2)] * 8
multi_pca.fit(data, confounds=confounds)
# Smoke test that multi_pca also works with single subject data
multi_pca.fit(data[0])
# Check that asking for too little components raises a ValueError
multi_pca = MultiPCA()
assert_raises(ValueError, multi_pca.fit, data[:2])
# Smoke test the use of a masker and without CCA
multi_pca = MultiPCA(mask=MultiNiftiMasker(mask_args=dict(opening=0)),
do_cca=False,
n_components=3)
multi_pca.fit(data[:2])
# Smoke test the transform and inverse_transform
multi_pca.inverse_transform(multi_pca.transform(data[-2:]))
# Smoke test to fit with no img
assert_raises(TypeError, multi_pca.fit)
multi_pca = MultiPCA(mask=mask_img, n_components=3)
assert_raises_regex(
ValueError, "Object has no components_ attribute. "
"This is probably because fit has not been called",
multi_pca.transform, data)
def test_components_img():
shape = (6, 8, 10, 5)
affine = np.eye(4)
rng = np.random.RandomState(0)
# Create a "multi-subject" dataset
data = []
for i in range(8):
this_data = rng.normal(size=shape)
# Create fake activation to get non empty mask
this_data[2:4, 2:4, 2:4, :] += 10
data.append(nibabel.Nifti1Image(this_data, affine))
mask_img = nibabel.Nifti1Image(np.ones(shape[:3], dtype=np.int8), affine)
n_components = 3
multi_pca = MultiPCA(mask=mask_img,
n_components=n_components,
random_state=0)
# fit to the data and test for components images
multi_pca.fit(data)
components_img = multi_pca.components_img_
assert_true(isinstance(components_img, nibabel.Nifti1Image))
check_shape = data[0].shape[:3] + (n_components, )
assert_equal(components_img.shape, check_shape)
assert_equal(len(components_img.shape), 4)
def test_multi_pca():
# Smoke test the MultiPCA
# XXX: this is mostly a smoke test
shape = (6, 8, 10, 5)
affine = np.eye(4)
rng = np.random.RandomState(0)
# Create a "multi-subject" dataset
data = []
for i in range(8):
this_data = rng.normal(size=shape)
# Create fake activation to get non empty mask
this_data[2:4, 2:4, 2:4, :] += 10
data.append(nibabel.Nifti1Image(this_data, affine))
mask_img = nibabel.Nifti1Image(np.ones(shape[:3], dtype=np.int8), affine)
multi_pca = MultiPCA(mask=mask_img, n_components=3)
# Test that the components are the same if we put twice the same data
components1 = multi_pca.fit(data).components_
components2 = multi_pca.fit(2 * data).components_
np.testing.assert_array_almost_equal(components1, components2)
# Smoke test that multi_pca also works with single subject data
multi_pca.fit(data[0])
# Check that asking for too little components raises a ValueError
multi_pca = MultiPCA()
nose.tools.assert_raises(ValueError, multi_pca.fit, data[:2])
# Smoke test the use of a masker and without CCA
multi_pca = MultiPCA(mask=MultiNiftiMasker(mask_opening=0),
do_cca=False,
n_components=3)
multi_pca.fit(data[:2])
# Smoke test the transform and inverse_transform
multi_pca.inverse_transform(multi_pca.transform(data[-2:]))
def test_with_globbing_patterns_with_single_image():
# With single image
data_4d = np.zeros((40, 40, 40, 3))
data_4d[20, 20, 20] = 1
img_4d = nibabel.Nifti1Image(data_4d, affine=np.eye(4))
multi_pca = MultiPCA(n_components=3)
with write_tmp_imgs(img_4d, create_files=True, use_wildcards=True) as img:
input_image = _tmp_dir() + img
multi_pca.fit(input_image)
components_img = multi_pca.components_img_
assert_true(isinstance(components_img, nibabel.Nifti1Image))
# n_components = 3
check_shape = img_4d.shape[:3] + (3, )
assert_equal(components_img.shape, check_shape)
assert_equal(len(components_img.shape), 4)
def test_multi_pca():
# Smoke test the MultiPCA
# XXX: this is mostly a smoke test
shape = (6, 8, 10, 5)
affine = np.eye(4)
rng = np.random.RandomState(0)
# Create a "multi-subject" dataset
data = []
for i in range(8):
this_data = rng.normal(size=shape)
# Create fake activation to get non empty mask
this_data[2:4, 2:4, 2:4, :] += 10
data.append(nibabel.Nifti1Image(this_data, affine))
mask_img = nibabel.Nifti1Image(np.ones(shape[:3], dtype=np.int8), affine)
multi_pca = MultiPCA(mask=mask_img, n_components=3,
random_state=0)
# fit to the data and test for masker attributes
multi_pca.fit(data)
assert multi_pca.mask_img_ == mask_img
assert multi_pca.mask_img_ == multi_pca.masker_.mask_img_
# Test that the components are the same if we put twice the same data, and
# that fit output is deterministic
components1 = multi_pca.components_
components2 = multi_pca.fit(data).components_
components3 = multi_pca.fit(2 * data).components_
np.testing.assert_array_equal(components1, components2)
np.testing.assert_array_almost_equal(components1, components3)
# Smoke test fit with 'confounds' argument
confounds = [np.arange(10).reshape(5, 2)] * 8
multi_pca.fit(data, confounds=confounds)
# Smoke test that multi_pca also works with single subject data
multi_pca.fit(data[0])
# Check that asking for too little components raises a ValueError
multi_pca = MultiPCA()
pytest.raises(ValueError, multi_pca.fit, data[:2])
# Test fit on data with the use of a masker
masker = MultiNiftiMasker()
multi_pca = MultiPCA(mask=masker, n_components=3)
multi_pca.fit(data)
assert multi_pca.mask_img_ == multi_pca.masker_.mask_img_
# Smoke test the use of a masker and without CCA
multi_pca = MultiPCA(mask=MultiNiftiMasker(mask_args=dict(opening=0)),
do_cca=False, n_components=3)
multi_pca.fit(data[:2])
# Smoke test the transform and inverse_transform
multi_pca.inverse_transform(multi_pca.transform(data[-2:]))
# Smoke test to fit with no img
pytest.raises(TypeError, multi_pca.fit)
multi_pca = MultiPCA(mask=mask_img, n_components=3)
with pytest.raises(ValueError,
match="Object has no components_ attribute. This is "
"probably because fit has not been called"):
multi_pca.transform(data)
# Test if raises an error when empty list of provided.
with pytest.raises(ValueError,
match='Need one or more Niimg-like objects as input, '
'an empty list was given.'):
multi_pca.fit([])
# Test passing masker arguments to estimator
multi_pca = MultiPCA(target_affine=affine,
target_shape=shape[:3],
n_components=3,
mask_strategy='background')
multi_pca.fit(data)