def test_component_sign():
# We should have a heuristic that flips the sign of components in
# CanICA to have more positive values than negative values, for
# instance by making sure that the largest value is positive.
# make data (SVD)
rng = np.random.RandomState(0)
shape = (20, 10, 1)
affine = np.eye(4)
components = _make_canica_components(shape)
# make +ve
for mp in components:
mp[rng.randn(*mp.shape) > .8] *= -5.
assert_less_equal(mp.max(), -mp.min()) # goal met ?
# synthesize data with given components
data = _make_data_from_components(components, affine, shape, rng=rng,
n_subjects=2)
mask_img = nibabel.Nifti1Image(np.ones(shape, dtype=np.int8), affine)
# run CanICA many times (this is known to produce different results)
canica = CanICA(n_components=4, random_state=rng, mask=mask_img)
for _ in range(3):
canica.fit(data)
for mp in iter_img(canica.masker_.inverse_transform(
canica.components_)):
mp = mp.get_data()
assert_less_equal(-mp.min(), mp.max())
def test_canica_square_img():
shape = (20, 20, 1)
affine = np.eye(4)
rng = np.random.RandomState(0)
# Create two images with "activated regions"
component1 = np.zeros(shape)
component1[:5, :10] = 1
component1[5:10, :10] = -1
component2 = np.zeros(shape)
component2[:5, -10:] = 1
component2[5:10, -10:] = -1
component3 = np.zeros(shape)
component3[-5:, -10:] = 1
component3[-10:-5, -10:] = -1
component4 = np.zeros(shape)
component4[-5:, :10] = 1
component4[-10:-5, :10] = -1
components = np.vstack((component1.ravel(), component2.ravel(),
component3.ravel(), component4.ravel()))
# Create a "multi-subject" dataset
data = []
for i in range(8):
this_data = np.dot(rng.normal(size=(40, 4)), components)
this_data += .01 * rng.normal(size=this_data.shape)
# Get back into 3D for CanICA
this_data = np.reshape(this_data, (40, ) + shape)
this_data = np.rollaxis(this_data, 0, 4)
data.append(nibabel.Nifti1Image(this_data, affine))
mask_img = nibabel.Nifti1Image(np.ones(shape, dtype=np.int8), affine)
# We do a large number of inits to be sure to find the good match
canica = CanICA(n_components=4,
random_state=rng,
mask=mask_img,
smoothing_fwhm=0.,
n_init=50)
canica.fit(data)
maps = canica.masker_.inverse_transform(canica.components_).get_data()
maps = np.rollaxis(maps, 3, 0)
# FIXME: This could be done more efficiently, e.g. thanks to hungarian
# Find pairs of matching components
# compute the cross-correlation matrix between components
K = np.corrcoef(components, maps.reshape(4, 400))[4:, :4]
# K should be a permutation matrix, hence its coefficients
# should all be close to 0 1 or -1
K_abs = np.abs(K)
assert_true(np.sum(K_abs > .9) == 4)
K_abs[K_abs > .9] -= 1
assert_array_almost_equal(K_abs, 0, 1)
# Smoke test to make sure an error is raised when no data is passed.
assert_raises(TypeError, canica.fit)
def test_canica_square_img():
data, mask_img, components, rng = _make_canica_test_data()
# We do a large number of inits to be sure to find the good match
canica = CanICA(n_components=4, random_state=rng, mask=mask_img,
smoothing_fwhm=0., n_init=50)
canica.fit(data)
maps = canica.components_img_.get_data()
maps = np.rollaxis(maps, 3, 0)
# FIXME: This could be done more efficiently, e.g. thanks to hungarian
# Find pairs of matching components
# compute the cross-correlation matrix between components
mask = mask_img.get_data() != 0
K = np.corrcoef(components[:, mask.ravel()],
maps[:, mask])[4:, :4]
# K should be a permutation matrix, hence its coefficients
# should all be close to 0 1 or -1
K_abs = np.abs(K)
assert_true(np.sum(K_abs > .9) == 4)
K_abs[K_abs > .9] -= 1
assert_array_almost_equal(K_abs, 0, 1)
# Smoke test to make sure an error is raised when no data is passed.
assert_raises(TypeError, canica.fit)
def test_canica_square_img():
shape = (20, 20, 1)
affine = np.eye(4)
rng = np.random.RandomState(0)
# Create two images with "activated regions"
component1 = np.zeros(shape)
component1[:5, :10] = 1
component1[5:10, :10] = -1
component2 = np.zeros(shape)
component2[:5, -10:] = 1
component2[5:10, -10:] = -1
component3 = np.zeros(shape)
component3[-5:, -10:] = 1
component3[-10:-5, -10:] = -1
component4 = np.zeros(shape)
component4[-5:, :10] = 1
component4[-10:-5, :10] = -1
components = np.vstack((component1.ravel(), component2.ravel(),
component3.ravel(), component4.ravel()))
# Create a "multi-subject" dataset
data = []
for i in range(8):
this_data = np.dot(rng.normal(size=(40, 4)), components)
this_data += .01 * rng.normal(size=this_data.shape)
# Get back into 3D for CanICA
this_data = np.reshape(this_data, (40, ) + shape)
this_data = np.rollaxis(this_data, 0, 4)
data.append(nibabel.Nifti1Image(this_data, affine))
mask_img = nibabel.Nifti1Image(np.ones(shape, dtype=np.int8), affine)
# We do a large number of inits to be sure to find the good match
canica = CanICA(n_components=4,
random_state=rng,
mask=mask_img,
smoothing_fwhm=0.,
n_init=50)
canica.fit(data)
maps = canica.masker_.inverse_transform(canica.components_).get_data()
maps = np.rollaxis(maps, 3, 0)
# FIXME: This could be done more efficiently, e.g. thanks to hungarian
# Find pairs of matching components
indices = range(4)
for i in range(4):
map = np.abs(maps[i]) > np.abs(maps[i]).max() * 0.95
for j in indices:
ref_map = components[j].ravel() != 0
if np.all(map.ravel() == ref_map):
indices.remove(j)
break
else:
assert False, "Non matching component"
def test_canica_square_img():
data, mask_img, components, rng = _make_canica_test_data()
# We do a large number of inits to be sure to find the good match
canica = CanICA(n_components=4,
random_state=rng,
mask=mask_img,
smoothing_fwhm=0.,
n_init=50)
canica.fit(data)
maps = get_data(canica.components_img_)
maps = np.rollaxis(maps, 3, 0)
# FIXME: This could be done more efficiently, e.g. thanks to hungarian
# Find pairs of matching components
# compute the cross-correlation matrix between components
mask = get_data(mask_img) != 0
K = np.corrcoef(components[:, mask.ravel()], maps[:, mask])[4:, :4]
# K should be a permutation matrix, hence its coefficients
# should all be close to 0 1 or -1
K_abs = np.abs(K)
assert_true(np.sum(K_abs > .9) == 4)
K_abs[K_abs > .9] -= 1
assert_array_almost_equal(K_abs, 0, 1)
# Smoke test to make sure an error is raised when no data is passed.
assert_raises(TypeError, canica.fit)
def test_masker_attributes_with_fit():
# Test base module at sub-class
data, mask_img, components, rng = _make_canica_test_data(n_subjects=3)
# Passing mask_img
canica = CanICA(n_components=3, mask=mask_img, random_state=0)
canica.fit(data)
assert_true(canica.mask_img_ == mask_img)
assert_true(canica.mask_img_ == canica.masker_.mask_img_)
# Passing masker
masker = MultiNiftiMasker(mask_img=mask_img)
canica = CanICA(n_components=3, mask=masker, random_state=0)
canica.fit(data)
assert_true(canica.mask_img_ == canica.masker_.mask_img_)
canica = CanICA(mask=mask_img, n_components=3)
assert_raises_regex(ValueError,
"Object has no components_ attribute. "
"This is probably because fit has not been called",
canica.transform, data)
# Test if raises an error when empty list of provided.
assert_raises_regex(ValueError,
'Need one or more Niimg-like objects as input, '
'an empty list was given.',
canica.fit, [])
# Test passing masker arguments to estimator
canica = CanICA(n_components=3,
target_affine=np.eye(4),
target_shape=(6, 8, 10),
mask_strategy='background')
canica.fit(data)
def test_canica_square_img():
shape = (20, 20, 1)
affine = np.eye(4)
rng = np.random.RandomState(0)
# Create two images with "activated regions"
component1 = np.zeros(shape)
component1[:5, :10] = 1
component1[5:10, :10] = -1
component2 = np.zeros(shape)
component2[:5, -10:] = 1
component2[5:10, -10:] = -1
component3 = np.zeros(shape)
component3[-5:, -10:] = 1
component3[-10:-5, -10:] = -1
component4 = np.zeros(shape)
component4[-5:, :10] = 1
component4[-10:-5, :10] = -1
components = np.vstack((component1.ravel(), component2.ravel(),
component3.ravel(), component4.ravel()))
# Create a "multi-subject" dataset
data = []
for i in range(8):
this_data = np.dot(rng.normal(size=(40, 4)), components)
this_data += .01 * rng.normal(size=this_data.shape)
# Get back into 3D for CanICA
this_data = np.reshape(this_data, (40,) + shape)
this_data = np.rollaxis(this_data, 0, 4)
data.append(nibabel.Nifti1Image(this_data, affine))
mask_img = nibabel.Nifti1Image(np.ones(shape, dtype=np.int8), affine)
# We do a large number of inits to be sure to find the good match
canica = CanICA(n_components=4, random_state=rng, mask=mask_img,
smoothing_fwhm=0., n_init=50)
canica.fit(data)
maps = canica.masker_.inverse_transform(canica.components_).get_data()
maps = np.rollaxis(maps, 3, 0)
# FIXME: This could be done more efficiently, e.g. thanks to hungarian
# Find pairs of matching components
indices = range(4)
for i in range(4):
map = np.abs(maps[i]) > np.abs(maps[i]).max() * 0.95
for j in indices:
ref_map = components[j].ravel() != 0
if np.all(map.ravel() == ref_map):
indices.remove(j)
break
else:
assert False, "Non matching component"
def test_components_img():
data, mask_img, _, _ = _make_canica_test_data(n_subjects=3)
n_components = 3
canica = CanICA(n_components=n_components, mask=mask_img)
canica.fit(data)
components_img = canica.components_img_
assert_true(isinstance(components_img, nibabel.Nifti1Image))
check_shape = data[0].shape[:3] + (n_components,)
assert_true(components_img.shape, check_shape)
def test_components_img():
data, mask_img, _, _ = _make_canica_test_data(n_subjects=3)
n_components = 3
canica = CanICA(n_components=n_components, mask=mask_img)
canica.fit(data)
components_img = canica.components_img_
assert_true(isinstance(components_img, nibabel.Nifti1Image))
check_shape = data[0].shape[:3] + (n_components, )
assert_true(components_img.shape, check_shape)
def test_canica_square_img():
shape = (20, 20, 1)
affine = np.eye(4)
rng = np.random.RandomState(0)
# Create two images with "activated regions"
component1 = np.zeros(shape)
component1[:5, :10] = 1
component1[5:10, :10] = -1
component2 = np.zeros(shape)
component2[:5, -10:] = 1
component2[5:10, -10:] = -1
component3 = np.zeros(shape)
component3[-5:, -10:] = 1
component3[-10:-5, -10:] = -1
component4 = np.zeros(shape)
component4[-5:, :10] = 1
component4[-10:-5, :10] = -1
components = np.vstack((component1.ravel(), component2.ravel(),
component3.ravel(), component4.ravel()))
# Create a "multi-subject" dataset
data = []
for i in range(8):
this_data = np.dot(rng.normal(size=(40, 4)), components)
this_data += .01 * rng.normal(size=this_data.shape)
# Get back into 3D for CanICA
this_data = np.reshape(this_data, (40,) + shape)
this_data = np.rollaxis(this_data, 0, 4)
data.append(nibabel.Nifti1Image(this_data, affine))
mask_img = nibabel.Nifti1Image(np.ones(shape, dtype=np.int8), affine)
# We do a large number of inits to be sure to find the good match
canica = CanICA(n_components=4, random_state=rng, mask=mask_img,
smoothing_fwhm=0., n_init=50)
canica.fit(data)
maps = canica.masker_.inverse_transform(canica.components_).get_data()
maps = np.rollaxis(maps, 3, 0)
# FIXME: This could be done more efficiently, e.g. thanks to hungarian
# Find pairs of matching components
# compute the cross-correlation matrix between components
K = np.corrcoef(components, maps.reshape(4, 400))[4:, :4]
# K should be a permutation matrix, hence its coefficients
# should all be close to 0 1 or -1
K_abs = np.abs(K)
assert_true(np.sum(K_abs > .9) == 4)
K_abs[K_abs > .9] -= 1
assert_array_almost_equal(K_abs, 0, 1)
# Smoke test to make sure an error is raised when no data is passed.
assert_raises(TypeError, canica.fit)
def test_canica_single_subject():
# Check that canica runs on a single-subject dataset
data, mask_img, components, rng = _make_canica_test_data(n_subjects=1)
# We do a large number of inits to be sure to find the good match
canica = CanICA(n_components=4, random_state=rng,
smoothing_fwhm=0., n_init=1)
# This is a smoke test: we just check that things run
canica.fit(data[0])
def test_canica_single_subject():
# Check that canica runs on a single-subject dataset
data, mask_img, components, rng = _make_canica_test_data(n_subjects=1)
# We do a large number of inits to be sure to find the good match
canica = CanICA(n_components=4,
random_state=rng,
smoothing_fwhm=0.,
n_init=1)
# This is a smoke test: we just check that things run
canica.fit(data[0])
def test_percentile_range():
# Smoke test to test warning in case ignored thresholds
rng = np.random.RandomState(0)
edge_case = rng.randint(low=1, high=10)
data, *_ = _make_canica_test_data()
# stess thresholding via edge case
canica = CanICA(n_components=edge_case, threshold=float(edge_case))
with warnings.catch_warnings(record=True) as warning:
canica.fit(data)
assert len(warning) == 1 # ensure single warning
assert "critical threshold" in str(warning[-1].message)
def test_with_globbing_patterns_with_single_subject():
# single subject
data, mask_img, _, _ = _make_canica_test_data(n_subjects=1)
n_components = 3
canica = CanICA(n_components=n_components, mask=mask_img)
with write_tmp_imgs(data[0], create_files=True, use_wildcards=True) as img:
input_image = _tmp_dir() + img
canica.fit(input_image)
components_img = canica.components_img_
assert_true(isinstance(components_img, nibabel.Nifti1Image))
# n_components = 3
check_shape = data[0].shape[:3] + (3, )
assert_true(components_img.shape, check_shape)
def test_with_globbing_patterns_with_single_subject():
# single subject
data, mask_img, _, _ = _make_canica_test_data(n_subjects=1)
n_components = 3
canica = CanICA(n_components=n_components, mask=mask_img)
with write_tmp_imgs(data[0], create_files=True, use_wildcards=True) as img:
input_image = _tmp_dir() + img
canica.fit(input_image)
components_img = canica.components_img_
assert_true(isinstance(components_img, nibabel.Nifti1Image))
# n_components = 3
check_shape = data[0].shape[:3] + (3,)
assert_true(components_img.shape, check_shape)
def get_fitted_canica(func_files, **params):
input_folder = params.pop('input_folder')
func_files = sorted(os.path.join(root, filename)
for root, dirs, filenames in os.walk(input_folder)
for filename in filenames
if filename.endswith('.nii.gz'))
canica = CanICA(memory='nilearn_cache', memory_level=5, random_state=0,
n_jobs=-1, **params)
if not func_files:
raise ValueError('Could not find any files in the input folder')
canica.fit(func_files)
return canica
def test_component_sign():
# We should have a heuristic that flips the sign of components in
# CanICA to have more positive values than negative values, for
# instance by making sure that the largest value is positive.
data, mask_img, components, rng = _make_canica_test_data(n_subjects=2,
noisy=True)
# run CanICA many times (this is known to produce different results)
canica = CanICA(n_components=4, random_state=rng, mask=mask_img)
for _ in range(3):
canica.fit(data)
for mp in iter_img(canica.components_img_):
mp = mp.get_data()
assert_less_equal(-mp.min(), mp.max())
def test_component_sign():
# We should have a heuristic that flips the sign of components in
# CanICA to have more positive values than negative values, for
# instance by making sure that the largest value is positive.
data, mask_img, components, rng = _make_canica_test_data(n_subjects=2,
noisy=True)
# run CanICA many times (this is known to produce different results)
canica = CanICA(n_components=4, random_state=rng, mask=mask_img)
for _ in range(3):
canica.fit(data)
for mp in iter_img(canica.components_img_):
mp = get_data(mp)
assert_less_equal(-mp.min(), mp.max())
def test_percentile_range():
# Smoke test to test warning in case ignored thresholds
rng = np.random.RandomState(0)
edge_case = rng.randint(low=1, high=10)
data, *_ = _make_canica_test_data()
# stess thresholding via edge case
canica = CanICA(n_components=edge_case, threshold=float(edge_case))
with warnings.catch_warnings(record=True) as warning:
canica.fit(data)
# Filter out deprecation warnings
not_deprecation_warning = [
not issubclass(w.category, DeprecationWarning) for w in warning
]
assert sum(not_deprecation_warning) == 1 # ensure single warning
idx_critical_warning = not_deprecation_warning.index(True)
assert "critical threshold" in str(
warning[idx_critical_warning].message)
def run_CanICA_NILEAN(output_dir, working_dir, population, n_components=20):
#create group ica outputdir
mkdir_path(os.path.join(working_dir, 'CANICA_GROUP_ICA'))
canica_dir = os.path.join(working_dir, 'CANICA_GROUP_ICA')
# grab subjects
preprocssed_all = []
for subject in population:
preprocssed_subject = os.path.join(output_dir, subject, 'xxxx.nii.gz')
preprocssed_all.append(preprocssed_subject)
canica = CanICA(n_components=n_components,
smoothing_fwhm=0.,
memory='nilearn_cashe',
memory_level=5,
threshold=3.,
verbose=10,
random_state=10)
canica.fit(preprocssed_all)
# save data
components_img = canica.masker_.inverse_transform(canica.components_)
components_img.to_filename(os.path.join(canica_dir, 'canica_IC.nii.gz'))
def run_CanICA_NILEAN(output_dir, working_dir, population, n_components = 20):
#create group ica outputdir
mkdir_path(os.path.join(working_dir, 'CANICA_GROUP_ICA'))
canica_dir = os.path.join(working_dir, 'CANICA_GROUP_ICA')
# grab subjects
preprocssed_all =[]
for subject in population:
preprocssed_subject = os.path.join(output_dir, subject, 'xxxx.nii.gz')
preprocssed_all.append(preprocssed_subject)
canica = CanICA(n_components=n_components,
smoothing_fwhm= 0.,
memory= 'nilearn_cashe',
memory_level= 5,
threshold = 3.,
verbose = 10,
random_state=10)
canica.fit(preprocssed_all)
# save data
components_img = canica.masker_.inverse_transform(canica.components_)
components_img.to_filename(os.path.join(canica_dir, 'canica_IC.nii.gz'))
def test_canica_score():
# Multi subjects
imgs, mask_img, _, _ = _make_canica_test_data(n_subjects=3)
n_components = 10
canica = CanICA(n_components=10, mask=mask_img, random_state=0)
canica.fit(imgs)
# One score for all components
scores = canica.score(imgs, per_component=False)
assert scores <= 1
assert 0 <= scores
# Per component score
scores = canica.score(imgs, per_component=True)
assert scores.shape, (n_components, )
assert np.all(scores <= 1)
assert np.all(0 <= scores)
# create artificial mask:
mask = np.ones(29696)
mask = np.expand_dims(mask, axis=1)
mask = np.expand_dims(mask, axis=1)
img = nib.Nifti1Image(mask, np.eye(4))
img.to_filename(
'/scr/murg2/MachineLearning/partialcorr/ICA/ICA_HCP/mask.nii.gz')
# run ICA on group level:
n_components = 20
n_jobs = 20 #number of CPUs used
canica = CanICA(
mask='/scr/murg2/MachineLearning/partialcorr/ICA/ICA_HCP/mask.nii.gz',
n_components=n_components,
smoothing_fwhm=0.,
threshold=None,
verbose=10,
random_state=0,
n_jobs=n_jobs)
canica.fit(filenames)
# Retrieve the independent components in brain space
components_img = canica.masker_.inverse_transform(canica.components_)
A = np.zeros((32492, n_components))
A[cort, :] = components_img.get_data().squeeze()
#np.save('/scr/murg2/MachineLearning/partialcorr/ICA/ICA_HCP/ica_HCP101_output_%s.npy' % str(n_components), A)
savemat(
'/scr/murg2/MachineLearning/partialcorr/ICA/ICA_HCP/ica_HCP101_output_%s.mat'
# MultiNiftiMasker, rather than the NiftiMasker
# We specify the target_affine to downsample to 3mm isotropic
# resolution
target_affine = np.diag((3, 3, 3))
epi_img = nibabel.load(func_files[0])
mean_epi = epi_img.get_data().mean(axis=-1)
mean_epi_img = nibabel.Nifti1Image(mean_epi, epi_img.get_affine())
mean_epi = resample_img(mean_epi_img, target_affine=target_affine).get_data()
### Apply CanICA ##############################################################
from nilearn.decomposition.canica import CanICA
n_components = 20
canica = CanICA(n_components=n_components,
smoothing_fwhm=6., target_affine=target_affine,
memory="nilearn_cache", memory_level=5,
threshold=3., verbose=10)
canica.fit(func_files)
components = canica.masker_.inverse_transform(canica.components_).get_data()
### Visualize the results #####################################################
# Show some interesting components
import pylab as pl
from scipy import ndimage
# Using a masked array is important to have transparency in the figures
components = np.ma.masked_equal(components, 0, copy=False)
for i in range(n_components):
pl.figure()
def test_masker_attributes_with_fit():
# Test base module at sub-class
data, mask_img, components, rng = _make_canica_test_data(n_subjects=3)
# Passing mask_img
canica = CanICA(n_components=3, mask=mask_img, random_state=0)
canica.fit(data)
assert_true(canica.mask_img_ == mask_img)
assert_true(canica.mask_img_ == canica.masker_.mask_img_)
# Passing masker
masker = MultiNiftiMasker(mask_img=mask_img)
canica = CanICA(n_components=3, mask=masker, random_state=0)
canica.fit(data)
assert_true(canica.mask_img_ == canica.masker_.mask_img_)
canica = CanICA(mask=mask_img, n_components=3)
assert_raises_regex(
ValueError, "Object has no components_ attribute. "
"This is probably because fit has not been called", canica.transform,
data)
# Test if raises an error when empty list of provided.
assert_raises_regex(
ValueError, 'Need one or more Niimg-like objects as input, '
'an empty list was given.', canica.fit, [])
# Test passing masker arguments to estimator
canica = CanICA(n_components=3,
target_affine=np.eye(4),
target_shape=(6, 8, 10),
mask_strategy='background')
canica.fit(data)
pet_files.append(pet_file[0])
img = nib.load(pet_file[0])
if idx == 0:
data4d = np.expand_dims(img.get_data(), axis=3)
else:
data4d = np.concatenate((data4d,
np.expand_dims(img.get_data(), axis=3)),
axis=3)
pet_files = np.array(pet_files)
img4d = nib.Nifti1Image(data4d, img.get_affine())
groups = ['AD', 'LMCI', 'MCI', 'Normal']
n_components = 20
canica = CanICA(n_components=n_components,
memory="nilearn_cache", memory_level=5,
threshold='auto', verbose=10, random_state=0)
canica.fit(img4d)
print 'inverse'
components_img = canica.masker_.inverse_transform(canica.components_)
components_img.to_filename('figures/canica_'+str(n_components)+'.nii.gz')
for i in range(n_components):
plot_stat_map(nib.Nifti1Image(components_img.get_data()[..., i],
components_img.get_affine()),
display_mode="z", title="IC %d"%i, cut_coords=1,
colorbar=False)
n_sample = 140
idx = np.random.randint(len(func_files), size=n_sample)
func_files_sample = np.array(func_files)[idx]
multi_masker = MultiNiftiMasker(mask_strategy='epi',
memory=CACHE_DIR,
n_jobs=1,
memory_level=2)
multi_masker.fit(func_files_sample)
plot_img(multi_masker.mask_img_)
n_components = 40
canica = CanICA(mask=multi_masker,
n_components=n_components,
smoothing_fwhm=6.,
memory=CACHE_DIR,
memory_level=5,
threshold=3.,
verbose=10,
random_state=0)
canica.fit(func_files_sample)
# Retrieve the independent components in brain space
components_img = canica.masker_.inverse_transform(canica.components_)
# components_img is a Nifti Image object, and can be saved to a file with
# the following line:
components_img.to_filename(
os.path.join(CACHE_DIR, 'canica_resting_state_140.nii.gz'))
### Visualize the results #####################################################
# Show some interesting components
# Clean signals
X_ = []
for x in X:
X_.append(signal.clean(x, standardize=True, detrend=False))
X = X_
### CanICA ####################################################################
if not exists(join(path, 'canica.nii.gz')):
try:
from nilearn.decomposition.canica import CanICA
t0 = time.time()
canica = CanICA(n_components=n_components, mask=mask_img,
smoothing_fwhm=6.,
memory="nilearn_cache", memory_level=1,
threshold=None,
random_state=1, n_jobs=-1)
canica.fit(dataset.func)
print('Canica: %f' % (time.time() - t0))
canica_components = masking.unmask(canica.components_, mask_img)
nibabel.save(nibabel.Nifti1Image(canica_components,
mask_img.get_affine()), join(path, 'canica.nii.gz'))
except ImportError:
import warnings
warnings.warn('nilearn must be installed to run CanICA')
canica_dmn = nibabel.load(join(path, 'canica.nii.gz')).get_data()[..., 4]
n_subjects = 40 # ?
### Load ADHD rest dataset ####################################################
from nilearn import datasets
adhd_dataset = datasets.fetch_adhd(n_subjects)
func_filenames = adhd_dataset.func # list of 4D nifti files for each subject
### Apply CanICA ##############################################################
import nibabel
from nilearn.decomposition.canica import CanICA
canica = CanICA(n_components=n_components,
smoothing_fwhm=6.,
memory="nilearn_cache",
memory_level=5,
threshold=3.,
verbose=10,
random_state=0,
max_iter=200)
print("Loading data...")
img_list = func_filenames #[nibabel.load(fn) for fn in func_filenames]
print("Fitting data...")
canica.fit(img_list)
# Retrieve the independent components in brain space
components_img = canica.masker_.inverse_transform(canica.components_)
# components_img is a Nifti Image object, and can be saved to a file with
# the following line:
components_img.to_filename('canica_resting_state.nii.gz')
### Visualize the results #####################################################
"""
### Load ADHD rest dataset ####################################################
from nilearn import datasets
dataset = datasets.fetch_adhd()
func_files = dataset.func # The list of 4D nifti files for each subject
### Apply CanICA ##############################################################
from nilearn.decomposition.canica import CanICA
n_components = 20
canica = CanICA(n_components=n_components,
smoothing_fwhm=6.,
memory="nilearn_cache",
memory_level=5,
threshold=3.,
verbose=10,
random_state=0)
canica.fit(func_files)
# Retrieve the independent components in brain space
components_img = canica.masker_.inverse_transform(canica.components_)
# components_img is a Nifti Image object, and can be saved to a file with
# the following line:
components_img.to_filename('canica_resting_state.nii.gz')
### Visualize the results #####################################################
# Show some interesting components
import nibabel
import matplotlib.pyplot as plt
idx = np.linspace(0, n_timesteps, n_timecourses + 1, dtype=int)
print "%d time slices, %d seconds per time slice" % (n_timecourses,
idx[1] - idx[0])
subj_img_list = [
index_img(subj_img, range(idx[ii], idx[ii + 1]))
for ii in range(n_timecourses)
]
all_images += subj_img_list
### Apply CanICA across subjects ##############################################################
print("Fitting data over all subjects (%d images)..." % len(all_images))
canica = CanICA(n_components=n_components,
smoothing_fwhm=6.,
memory="nilearn_cache",
memory_level=5,
max_iter=max_iter,
threshold=3.,
verbose=10,
random_state=0)
canica.fit(all_images)
components_img = canica.masker_.inverse_transform(canica.components_)
nibabel.save(components_img, 'components_img_cuts.nii')
### Visualize the results #####################################################
# Show some interesting components
import matplotlib.pyplot as plt
from nilearn.plotting import plot_roi, plot_stat_map, plot_glass_brain, find_xyz_cut_coords
fh = plt.figure(facecolor='w', figsize=(18, 10))
nrows = int(np.floor(np.sqrt(0.75 * n_components))) # 4:3 aspect
ncols = int(np.ceil(n_components / float(nrows)))
Pre-prints for both papers are available on hal
(http://hal.archives-ouvertes.fr)
"""
### Load ADHD rest dataset ####################################################
from nilearn import datasets
adhd_dataset = datasets.fetch_adhd()
func_filenames = adhd_dataset.func # list of 4D nifti files for each subject
### Apply CanICA ##############################################################
from nilearn.decomposition.canica import CanICA
n_components = 20
canica = CanICA(n_components=n_components, smoothing_fwhm=6.,
memory="nilearn_cache", memory_level=5,
threshold=3., verbose=10, random_state=0)
canica.fit(func_filenames)
# Retrieve the independent components in brain space
components_img = canica.masker_.inverse_transform(canica.components_)
# components_img is a Nifti Image object, and can be saved to a file with
# the following line:
components_img.to_filename('canica_resting_state.nii.gz')
### Visualize the results #####################################################
# Show some interesting components
import nibabel
import matplotlib.pyplot as plt
from nilearn.plotting import plot_stat_map
# Clean signals
X_ = []
for x in X:
X_.append(signal.clean(x, standardize=True, detrend=False))
X = X_
### CanICA ####################################################################
if not exists(join(path, 'canica.nii.gz')):
try:
from nilearn.decomposition.canica import CanICA
t0 = time.time()
canica = CanICA(n_components=n_components,
mask=mask_img,
smoothing_fwhm=6.,
memory="nilearn_cache",
memory_level=1,
threshold=None,
random_state=1,
n_jobs=-1)
canica.fit(dataset.func)
print('Canica: %f' % (time.time() - t0))
canica_components = masking.unmask(canica.components_, mask_img)
nibabel.save(
nibabel.Nifti1Image(canica_components, mask_img.get_affine()),
join(path, 'canica.nii.gz'))
except ImportError:
import warnings
warnings.warn('nilearn must be installed to run CanICA')
canica_dmn = nibabel.load(join(path, 'canica.nii.gz')).get_data()[..., 4]
subj_img = nibabel.load(fn)
n_timesteps = subj_img.shape[-1]
n_timecourses = np.floor(n_timesteps / float(n_components)).astype(int)
idx = np.linspace(0, n_timesteps, n_timecourses, dtype=int)
print "%d time slices, %d seconds per time slice" % (n_timecourses,
idx[1] - idx[0])
subj_img_list = [
index_img(subj_img, range(idx[ii - 1], idx[ii]))
for ii in range(1, n_timecourses)
]
print("Fitting data for subject %d..." % si)
subj_canica = CanICA(n_components=n_components,
smoothing_fwhm=6.,
memory="nilearn_cache",
memory_level=5,
max_iter=max_iter,
threshold=3.,
verbose=10,
random_state=0)
subj_canica.fit(subj_img_list)
print("Projecting subject data into computed components...")
subj_loadings = subj_canica.transform(subj_img)
subj_component_imgs = subj_canica.masker_.inverse_transform(
subj_canica.components_)
subj_loadings_imgs = []
for time_series, component_volume in zip(subj_loadings.T,
subj_component_imgs.get_data()):
tiled_img_data = np.tile(component_volume[..., np.newaxis],
len(time_series))
loaded_time_series = tiled_img_data * time_series
