def _do_subject_smooth(subject_data,
fwhm,
prefix=None,
write_output_images=2,
func_basenames=None,
concat=False,
caching=True):
if prefix is None:
prefix = PREPROC_OUTPUT_IMAGE_PREFICES['smoothing']
if func_basenames is None:
func_basenames = [get_basenames(func) for func in subject_data.func]
if caching:
mem = Memory(cachedir=os.path.join(subject_data.output_dir,
'cache_dir'),
verbose=100)
sfunc = []
for sess in range(subject_data.n_sessions):
sess_func = subject_data.func[sess]
_tmp = mem.cache(smooth_image)(sess_func, fwhm)
if write_output_images == 2:
_tmp = mem.cache(save_vols)(_tmp,
subject_data.output_dir,
basenames=func_basenames[sess],
prefix=prefix,
concat=concat)
sfunc.append(_tmp)
subject_data.func = sfunc
return subject_data
def _delete_orientation(self):
"""
Delete orientation metadata. Garbage orientation metadata can lead to
severe mis-registration trouble.
"""
# prepare for smart caching
if self.scratch is None:
self.scratch = self.output_dir
cache_dir = os.path.join(self.scratch, 'cache_dir')
if not os.path.exists(cache_dir):
os.makedirs(cache_dir)
mem = Memory(cachedir=cache_dir, verbose=5)
# deleteorient for func
for attr in ['n_sessions', 'session_output_dirs']:
if getattr(self, attr) is None:
warnings.warn("'%s' attribute of is None! Skipping" % attr)
break
else:
self.func = [mem.cache(delete_orientation)(
self.func[sess], self.session_output_dirs[sess])
for sess in range(self.n_sessions)]
# deleteorient for anat
if self.anat is not None:
self.anat = mem.cache(delete_orientation)(
self.anat, self.anat_output_dir)
def _delete_orientation(self):
"""
Delete orientation metadata. Garbage orientation metadata can lead to
severe mis-registration trouble.
"""
# prepare for smart caching
if self.scratch is None:
self.scratch = self.output_dir
if self.caching:
cache_dir = os.path.join(self.scratch, 'cache_dir')
if not os.path.exists(cache_dir):
os.makedirs(cache_dir)
mem = Memory(cachedir=cache_dir, verbose=5)
else:
mem = Memory(None, verbose=0)
# deleteorient for func
for attr in ['n_sessions', 'session_output_dirs']:
if getattr(self, attr) is None:
warnings.warn("'%s' attribute of is None! Skipping" % attr)
break
else:
self.func = [
mem.cache(delete_orientation)(self.func[sess],
self.session_output_dirs[sess])
for sess in range(self.n_sessions)
]
# deleteorient for anat
if self.anat is not None:
self.anat = mem.cache(delete_orientation)(self.anat,
self.anat_output_dir)
def _do_subject_slice_timing(subject_data, ref_slice=0,
slice_order="ascending", interleaved=False,
caching=True, write_output_images=2,
func_prefix=None, func_basenames=None,
ext=None, verbose=True):
if func_prefix is None:
func_prefix = PREPROC_OUTPUT_IMAGE_PREFICES['STC']
if func_basenames is None:
func_basenames = [get_basenames(func)
for func in subject_data.func]
# prepare for smart caching
if caching:
mem = Memory(cachedir=os.path.join(
subject_data.output_dir, 'cache_dir'),
verbose=100 if verbose is True else verbose)
else:
mem = Memory(None)
stc_output = []
original_bold = subject_data.func
for sidx, sess_func in enumerate(subject_data.func):
fmristc = fMRISTC(slice_order=slice_order, ref_slice=ref_slice,
interleaved=interleaved, verbose=verbose)
mem.cache(fmristc.fit)(raw_data=sess_func)
stc_output.append(mem.cache(fmristc.transform)(
sess_func,
output_dir=subject_data.session_output_dirs[sidx] if (
write_output_images > 0) else None,
basenames=func_basenames[sidx],
prefix=func_prefix, ext=ext))
subject_data.func = stc_output
del original_bold, fmristc
if write_output_images > 1:
subject_data.hardlink_output_files(verbose=verbose)
return subject_data
def fit(self, X, y=None):
"""
Compute agglomerative clustering.
Parameters
----------
X : array-like, shape=(n_samples, n_features)
Returns
-------
self
"""
memory = self.memory
if isinstance(memory, six.string_types):
memory = Memory(cachedir=memory, verbose=0)
if self.n_landmarks is None:
distances = memory.cache(pdist)(X, self.metric)
else:
if self.landmark_strategy == 'random':
land_indices = check_random_state(self.random_state).randint(len(X), size=self.n_landmarks)
else:
land_indices = np.arange(len(X))[::(len(X) // self.n_landmarks)][:self.n_landmarks]
distances = memory.cache(pdist)(X[land_indices], self.metric)
tree = memory.cache(linkage)(distances, method=self.linkage)
self.landmark_labels_ = fcluster(tree, criterion='maxclust', t=self.n_clusters) - 1
if self.n_landmarks is None:
self.landmarks_ = X
else:
self.landmarks_ = X[land_indices]
return self
def transform(self, niimgs):
memory = self.transform_memory
if isinstance(memory, basestring):
memory = Memory(cachedir=memory)
# Load data (if filenames are given, load them)
if self.verbose > 0:
print "[%s.transform] Loading data" % self.__class__.__name__
niimgs = utils.check_niimgs(niimgs)
# Resampling: allows the user to change the affine, the shape or both
if self.verbose > 0:
print "[%s.transform] Resampling" % self.__class__.__name__
niimgs = memory.cache(resampling.resample_img)(niimgs,
target_affine=self.target_affine,
target_shape=self.target_shape)
# Get series from data with optional smoothing
if self.verbose > 0:
print "[%s.transform] Masking and smoothing" \
% self.__class__.__name__
data = masking.apply_mask(niimgs, self.mask_, smooth=self.smooth)
# Temporal
# ========
# Detrending (optional)
# Filtering (grab TR from header)
# Confounds (from csv file or numpy array)
# Normalizing
if self.verbose > 0:
print "[%s.transform] Cleaning signal" % self.__class__.__name__
if self.sessions_ is None:
data = memory.cache(signals.clean)(data,
confounds=self.confounds, low_pass=self.low_pass,
high_pass=self.high_pass, t_r=self.t_r,
detrend=self.detrend, normalize=False)
else:
for s in np.unique(self.sessions_):
if self.confounds is not None:
session_confounds = self.confounds[self.sessions_ == s]
data[self.sessions_ == s] = \
memory.cache(signals.clean)(
data=data[self.sessions_ == s],
confounds=session_confounds,
low_pass=self.low_pass,
high_pass=self.high_pass, t_r=self.t_r,
detrend=self.detrend, normalize=False)
# For _later_: missing value removal or imputing of missing data
# (i.e. we want to get rid of NaNs, if smoothing must be done
# earlier)
# Optionally: 'doctor_nan', remove voxels with NaNs, other option
# for later: some form of imputation
# data is in format voxel x time_series. We inverse it
data = np.rollaxis(data, -1)
self.affine_ = niimgs.get_affine()
return data
def fit(self, X, y=None):
"""
Compute agglomerative clustering.
Parameters
----------
X : array-like, shape=(n_samples, n_features)
Returns
-------
self
"""
memory = self.memory
if isinstance(memory, six.string_types):
memory = Memory(cachedir=memory, verbose=0)
if self.n_landmarks is None:
distances = memory.cache(pdist)(X, self.metric)
else:
if self.landmark_strategy == 'random':
land_indices = check_random_state(self.random_state).randint(len(X), size=self.n_landmarks)
else:
land_indices = np.arange(len(X))[::(len(X)//self.n_landmarks)][:self.n_landmarks]
distances = memory.cache(pdist)(X[land_indices], self.metric)
tree = memory.cache(linkage)(distances, method=self.linkage)
self.landmark_labels_ = fcluster(tree, criterion='maxclust', t=self.n_clusters) - 1
if self.n_landmarks is None:
self.landmarks_ = X
else:
self.landmarks_ = X[land_indices]
return self
def _do_subject_coregister(
subject_data, coreg_func_to_anat=True, caching=True,
ext=None, write_output_images=2, func_basenames=None, func_prefix="",
anat_basename=None, anat_prefix="", report=True, verbose=True):
ref_brain = 'func'
src_brain = 'anat'
ref = subject_data.func[0]
src = subject_data.anat
if coreg_func_to_anat:
ref_brain, src_brain = src_brain, ref_brain
ref, src = src, ref
# prepare for smart caching
if caching:
mem = Memory(cachedir=os.path.join(
subject_data.output_dir, 'cache_dir'),
verbose=100 if verbose is True else verbose)
else:
mem = Memory()
# estimate realignment (affine) params for coreg
coreg = Coregister(verbose=verbose)
coreg = mem.cache(coreg.fit)(ref, src)
# apply coreg
if coreg_func_to_anat:
if func_basenames is None:
func_basenames = [get_basenames(func)
for func in subject_data.func]
coreg_func = []
for sidx, sess_func in enumerate(subject_data.func):
output_dir = subject_data.session_scratch_dirs[sidx]
coreg_func.append(mem.cache(coreg.transform)(
sess_func, output_dir=output_dir if (
write_output_images == 2) else None,
basenames=func_basenames[sidx] if coreg_func_to_anat
else anat_basename, prefix=func_prefix))
subject_data.func = coreg_func
src = load_vols(subject_data.func[0])[0]
else:
if anat_basename is None:
anat_basename = get_basenames(subject_data.anat)
subject_data.anat = mem.cache(coreg.transform)(
subject_data.anat, basename=anat_basename,
output_dir=subject_data.anat_scratch_output_dir if (
write_output_images == 2) else None, prefix=anat_prefix,
ext=ext)
src = subject_data.anat
# generate coregistration QA thumbs
if report:
subject_data.generate_coregistration_thumbnails(
coreg_func_to_anat=coreg_func_to_anat, nipype=False)
del coreg
if write_output_images > 1:
subject_data.hardlink_output_files(verbose=verbose)
return subject_data
def _cache(self, func, memory_level=1, **kwargs):
""" Return a joblib.Memory object if necessary.
The memory_level determines the level above which the wrapped
function output is cached. By specifying a numeric value for
this level, the user can to control the amount of cache memory
used. This function will cache the function call or not
depending on the cache level.
Parameters
----------
func: python function
The function which output is to be cached.
memory_level: integer
The memory_level from which caching must be enabled for the wrapped
function.
Returns
-------
Either the original function, if there is no need to cache it (because
the requested level is lower than the value given to _cache()) or a
joblib.Memory object that wraps the function func.
"""
# Creates attributes if they don't exist
# This is to make creating them in __init__() optional.
if not hasattr(self, "memory_level"):
self.memory_level = 0
if not hasattr(self, "memory"):
self.memory = Memory(cachedir=None)
# If cache level is 0 but a memory object has been provided, set
# memory_level to 1 with a warning.
if self.memory_level == 0:
if (isinstance(self.memory, basestring)
or self.memory.cachedir is not None):
warnings.warn("memory_level is currently set to 0 but "
"a Memory object has been provided. "
"Setting memory_level to 1.")
self.memory_level = 1
if self.memory_level < memory_level:
mem = Memory(cachedir=None)
return mem.cache(func, **kwargs)
else:
memory = self.memory
if isinstance(memory, basestring):
memory = Memory(cachedir=memory)
if not isinstance(memory, Memory):
raise TypeError("'memory' argument must be a string or a "
"joblib.Memory object.")
if memory.cachedir is None:
warnings.warn(
"Caching has been enabled (memory_level = %d) but no"
" Memory object or path has been provided (parameter"
" memory). Caching deactivated for function %s." %
(self.memory_level, func.func_name))
return memory.cache(func, **kwargs)
def _cache(self, func, memory_level=1, **kwargs):
""" Return a joblib.Memory object if necessary.
The memory_level determines the level above which the wrapped
function output is cached. By specifying a numeric value for
this level, the user can to control the amount of cache memory
used. This function will cache the function call or not
depending on the cache level.
Parameters
----------
func: python function
The function which output is to be cached.
memory_level: integer
The memory_level from which caching must be enabled for the wrapped
function.
Returns
-------
Either the original function, if there is no need to cache it (because
the requested level is lower than the value given to _cache()) or a
joblib.Memory object that wraps the function func.
"""
# Creates attributes if they don't exist
# This is to make creating them in __init__() optional.
if not hasattr(self, "memory_level"):
self.memory_level = 0
if not hasattr(self, "memory"):
self.memory = Memory(cachedir=None)
# If cache level is 0 but a memory object has been provided, set
# memory_level to 1 with a warning.
if self.memory_level == 0:
if (isinstance(self.memory, basestring)
or self.memory.cachedir is not None):
warnings.warn("memory_level is currently set to 0 but "
"a Memory object has been provided. "
"Setting memory_level to 1.")
self.memory_level = 1
if self.memory_level < memory_level:
mem = Memory(cachedir=None)
return mem.cache(func, **kwargs)
else:
memory = self.memory
if isinstance(memory, basestring):
memory = Memory(cachedir=memory)
if not isinstance(memory, Memory):
raise TypeError("'memory' argument must be a string or a "
"joblib.Memory object.")
if memory.cachedir is None:
warnings.warn("Caching has been enabled (memory_level = %d) but no"
" Memory object or path has been provided (parameter"
" memory). Caching deactivated for function %s." %
(self.memory_level, func.func_name))
return memory.cache(func, **kwargs)
def affine_registration_pypreprocess(in_path, ref_path, out_path,
in_ref_mat = '', ref_in_mat = '',
T = None, force_resample = False,
extra_params={}):
"""
Affine registation and resampling. Use Coregister from pypreprocess.
Coregister is designed for transformation between func and anat, so applying
this function to mni standard space may not produce the best result.
inputs:
in_path: path to the source (input) image.
ref_path: path to the target (reference) image.
out_path: path to use to save the registered image.
in_ref_mat: if bool(in_ref_mat) is True, save the 4x4 transformation
matrix to a text file <in_ref_mat>.
ref_in_mat: if bool(ref_in_mat) is True, save the reverse of the 4x4
transformation matrix to a text file <ref_in_mat>.
T: specific transformation to use. if None, T will be estimated using
Coregister().fit; else numpy.array(T) will be used. T is an array
of 6 elements; the first three represent translation, and the last
three represent rotations.
force_resample: bool. whether or not to resample in an extra step.
by default pypreprocess does not resample data, which means we have
to use nilearn's module to do that. also scaling is not one of the
provided DoF/estimation parameters of pypreprocess, neither did I
implement it myself. maybe check scipy.misc.imresize if scaling
needs to be implemented in the future.
extra_params: for Coregister()
"""
source = nib.load(in_path)
target = nib.load(ref_path)
# coreg = Coregister()
coreg = AllFeatures(Coregister, extra_params).run()
if T is None:
mem = Memory("affine_registration_pypreprocess_cache")
coreg = mem.cache(coreg.fit)(target, source) # fit(target, source)
else:
T_ = np.array(T)
if T_.size != 6 or T_.dtype != float:
raise ValueError('T should either be None or ndarray with size 6 and dtype float')
print('using predefined T = %s' % T)
coreg.params_ = T_
img = coreg.transform(source)[0]
if force_resample: # no rescaling here
img = mem.cache(resample_img)(img, target.affine, target.shape)
nib.save(img, out_path)
if in_ref_mat:
np.savetxt(in_ref_mat, coreg.params_)
if ref_in_mat:
np.savetxt(ref_in_mat, -coreg.params_)
return coreg.params_
def fit(self, niimgs, y=None):
"""Compute the mask corresponding to the data
Parameters
----------
niimgs: list of filenames or NiImages
Data on which the mask must be calculated. If this is a list,
the affine is considered the same for all.
"""
memory = self.memory
if isinstance(memory, basestring):
memory = Memory(cachedir=memory)
# Load data (if filenames are given, load them)
if self.verbose > 0:
print "[%s.fit] Loading data from %s" % (
self.__class__.__name__,
utils._repr_niimgs(niimgs)[:200])
data = []
for niimg in niimgs:
# Note that data is not loaded into memory at this stage
# if niimg is a string
data.append(utils.check_niimgs(niimg, accept_3d=True))
# Compute the mask if not given by the user
if self.mask is None:
if self.verbose > 0:
print "[%s.fit] Computing the mask" % self.__class__.__name__
mask = memory.cache(masking.compute_multi_epi_mask,
ignore=['verbose'])(
niimgs,
connected=self.mask_connected,
opening=self.mask_opening,
lower_cutoff=self.mask_lower_cutoff,
upper_cutoff=self.mask_upper_cutoff,
n_jobs=self.n_jobs,
verbose=(self.verbose - 1))
self.mask_img_ = Nifti1Image(mask.astype(np.int), data[0].get_affine())
else:
self.mask_img_ = utils.check_niimg(self.mask)
# If resampling is requested, resample also the mask
# Resampling: allows the user to change the affine, the shape or both
if self.verbose > 0:
print "[%s.transform] Resampling mask" % self.__class__.__name__
self.mask_img_ = memory.cache(resampling.resample_img)(
self.mask_img_,
target_affine=self.target_affine,
target_shape=self.target_shape,
copy=(self.target_affine is not None and
self.target_shape is not None))
return self
def fit(self, niimgs, y=None):
"""Compute the mask corresponding to the data
Parameters
----------
niimgs: list of filenames or NiImages
Data on which the mask must be calculated. If this is a list,
the affine is considered the same for all.
"""
memory = self.memory
if isinstance(memory, basestring):
memory = Memory(cachedir=memory)
# Load data (if filenames are given, load them)
if self.verbose > 0:
print "[%s.fit] Loading data from %s" % (
self.__class__.__name__, utils._repr_niimgs(niimgs)[:200])
data = []
for niimg in niimgs:
# Note that data is not loaded into memory at this stage
# if niimg is a string
data.append(utils.check_niimgs(niimg, accept_3d=True))
# Compute the mask if not given by the user
if self.mask is None:
if self.verbose > 0:
print "[%s.fit] Computing the mask" % self.__class__.__name__
mask = memory.cache(masking.compute_multi_epi_mask,
ignore=['verbose'
])(niimgs,
connected=self.mask_connected,
opening=self.mask_opening,
lower_cutoff=self.mask_lower_cutoff,
upper_cutoff=self.mask_upper_cutoff,
n_jobs=self.n_jobs,
verbose=(self.verbose - 1))
self.mask_img_ = Nifti1Image(mask.astype(np.int),
data[0].get_affine())
else:
self.mask_img_ = utils.check_niimg(self.mask)
# If resampling is requested, resample also the mask
# Resampling: allows the user to change the affine, the shape or both
if self.verbose > 0:
print "[%s.transform] Resampling mask" % self.__class__.__name__
self.mask_img_ = memory.cache(resampling.resample_img)(
self.mask_img_,
target_affine=self.target_affine,
target_shape=self.target_shape,
copy=(self.target_affine is not None
and self.target_shape is not None))
return self
def _fit(self, X, y=None, **fit_params):
self._validate_steps()
# Setup the memory
memory = self.memory
if memory is None:
memory = Memory(cachedir=None, verbose=0)
elif isinstance(memory, six.string_types):
memory = Memory(cachedir=memory, verbose=0)
elif not isinstance(memory, Memory):
raise ValueError("'memory' should either be a string or"
" a joblib.Memory instance, got"
" 'memory={!r}' instead.".format(memory))
fit_transform_one_cached = memory.cache(_fit_transform_one)
fit_sample_one_cached = memory.cache(_fit_sample_one)
fit_params_steps = dict((name, {}) for name, step in self.steps
if step is not None)
for pname, pval in six.iteritems(fit_params):
step, param = pname.split('__', 1)
fit_params_steps[step][param] = pval
Xt = X
yt = y
for step_idx, (name, transformer) in enumerate(self.steps[:-1]):
if transformer is None:
pass
else:
if memory.cachedir is None:
# we do not clone when caching is disabled to preserve
# backward compatibility
cloned_transformer = transformer
else:
cloned_transformer = clone(transformer)
# Fit or load from cache the current transfomer
if (hasattr(cloned_transformer, "transform") or
hasattr(cloned_transformer, "fit_transform")):
Xt, fitted_transformer = fit_transform_one_cached(
cloned_transformer, None, Xt, yt,
**fit_params_steps[name])
elif hasattr(cloned_transformer, "sample"):
Xt, yt, fitted_transformer = fit_sample_one_cached(
cloned_transformer, Xt, yt,
**fit_params_steps[name])
# Replace the transformer of the step with the fitted
# transformer. This is necessary when loading the transformer
# from the cache.
self.steps[step_idx] = (name, fitted_transformer)
if self._final_estimator is None:
return Xt, yt, {}
return Xt, yt, fit_params_steps[self.steps[-1][0]]
def _fit(self, X, y=None, **fit_params):
self._validate_steps()
# Setup the memory
memory = self.memory
if memory is None:
memory = Memory(cachedir=None, verbose=0)
elif isinstance(memory, six.string_types):
memory = Memory(cachedir=memory, verbose=0)
elif not isinstance(memory, Memory):
raise ValueError("'memory' should either be a string or"
" a joblib.Memory instance, got"
" 'memory={!r}' instead.".format(memory))
fit_transform_one_cached = memory.cache(_fit_transform_one)
fit_resample_one_cached = memory.cache(_fit_resample_one)
fit_params_steps = dict(
(name, {}) for name, step in self.steps if step is not None)
for pname, pval in six.iteritems(fit_params):
step, param = pname.split('__', 1)
fit_params_steps[step][param] = pval
Xt = X
yt = y
for step_idx, (name, transformer) in enumerate(self.steps[:-1]):
if transformer is None:
pass
else:
if memory.cachedir is None:
# we do not clone when caching is disabled to preserve
# backward compatibility
cloned_transformer = transformer
else:
cloned_transformer = clone(transformer)
# Fit or load from cache the current transfomer
if (hasattr(cloned_transformer, "transform")
or hasattr(cloned_transformer, "fit_transform")):
Xt, fitted_transformer = fit_transform_one_cached(
cloned_transformer, None, Xt, yt,
**fit_params_steps[name])
elif hasattr(cloned_transformer, "fit_resample"):
Xt, yt, fitted_transformer = fit_resample_one_cached(
cloned_transformer, Xt, yt, **fit_params_steps[name])
# Replace the transformer of the step with the fitted
# transformer. This is necessary when loading the transformer
# from the cache.
self.steps[step_idx] = (name, fitted_transformer)
if self._final_estimator is None:
return Xt, yt, {}
return Xt, yt, fit_params_steps[self.steps[-1][0]]
def motion_correction_nipy(in_file, out_path, mc_alg, extra_params={}):
"""
an attempt at motion correction using NiPy package.
inputs:
in_file: Full path to the resting-state scan.
out_path: Full path to the (to be) output file.
mc_alg: can be either 'nipy_spacerealign' or 'nipy_spacetimerealign'
extra_params: extra parameters to SpaceRealign, SpaceTimeRealign, estimate
return: the motion corrected image
"""
alg_dict = {
'nipy_spacerealign': (SpaceRealign, {}),
'nipy_spacetimerealign': (SpaceTimeRealign, {
'tr': 2,
'slice_times': 'asc_alt_2',
'slice_info': 2
})
}
# format: {'function_name':(function, kwargs), ...}
# processing starts here
if type(in_file) in nib.all_image_classes:
I = nifti2nipy(in_file) # assume Nifti1Image
else:
I = load_image(in_file)
print 'source image loaded. '
# initialize the registration algorithm
reg = AllFeatures(alg_dict[mc_alg][0],
extra_params).run(I, **alg_dict[mc_alg][1])
# reg = alg_dict[mc_alg][0](I, **alg_dict[mc_alg][1]) # SpaceTimeRealign(I, tr=2, ...)
print 'motion correction algorithm established. '
print 'estimating...'
if USE_CACHE:
mem = Memory("func_preproc_cache_2")
mem.cache(AllFeatures(reg.estimate, extra_params).run)(refscan=None)
# mem.cache(reg.estimate)(refscan=None)
else:
AllFeatures(reg.estimate, extra_params).run(refscan=None)
# reg.estimate(refscan=None)
print 'estimation complete. Writing to file...'
result = reg.resample(0)
if out_path:
save_image(result, out_path)
return nipy2nifti(result)
def _niigz2nii(self):
"""
Convert .nii.gz to .nii (crucial for SPM).
"""
cache_dir = os.path.join(self.scratch, 'cache_dir')
mem = Memory(cache_dir, verbose=100)
self._sanitize_session_output_dirs()
if not None in [self.func, self.n_sessions, self.session_output_dirs]:
self.func = [mem.cache(do_niigz2nii)(
self.func[sess], output_dir=self.session_output_dirs[sess])
for sess in range(self.n_sessions)]
if not self.anat is None:
self.anat = mem.cache(do_niigz2nii)(
self.anat, output_dir=self.anat_output_dir)
def test_multilabel(self):
cache = Memory(cachedir=tempfile.gettempdir())
cached_func = cache.cache(
sklearn.datasets.make_multilabel_classification)
X, Y = cached_func(n_samples=150,
n_features=20,
n_classes=5,
n_labels=2,
length=50,
allow_unlabeled=True,
sparse=False,
return_indicator=True,
return_distributions=False,
random_state=1)
X_train = X[:100, :]
Y_train = Y[:100, :]
X_test = X[101:, :]
Y_test = Y[101:, ]
data = {
'X_train': X_train,
'Y_train': Y_train,
'X_test': X_test,
'Y_test': Y_test
}
dataset_properties = {'multilabel': True}
cs = SimpleClassificationPipeline(dataset_properties=dataset_properties).\
get_hyperparameter_search_space()
self._test_configurations(configurations_space=cs, data=data)
def test_multilabel(self):
cache = Memory(cachedir=tempfile.gettempdir())
cached_func = cache.cache(
sklearn.datasets.make_multilabel_classification
)
X, Y = cached_func(
n_samples=150,
n_features=20,
n_classes=5,
n_labels=2,
length=50,
allow_unlabeled=True,
sparse=False,
return_indicator=True,
return_distributions=False,
random_state=1
)
X_train = X[:100, :]
Y_train = Y[:100, :]
X_test = X[101:, :]
Y_test = Y[101:, ]
data = {'X_train': X_train, 'Y_train': Y_train,
'X_test': X_test, 'Y_test': Y_test}
dataset_properties = {'multilabel': True}
cs = SimpleClassificationPipeline(dataset_properties=dataset_properties).\
get_hyperparameter_search_space()
self._test_configurations(configurations_space=cs, data=data)
def comput_coefs(self, X, y, size):
cv = KFold(2) # cross-validation generator for model selection
ridge = BayesianRidge()
cachedir = tempfile.mkdtemp()
mem = Memory(cachedir=cachedir, verbose=1)
# Ward agglomeration followed by BayesianRidge
connectivity = grid_to_graph(n_x=size, n_y=size)
ward = FeatureAgglomeration(n_clusters=10, connectivity=connectivity,
memory=mem)
clf = Pipeline([('ward', ward), ('ridge', ridge)])
# Select the optimal number of parcels with grid search
clf = GridSearchCV(clf, {'ward__n_clusters': [10, 20, 30]}, n_jobs=1, cv=cv)
clf.fit(X, y) # set the best parameters
coef_ = clf.best_estimator_.steps[-1][1].coef_
coef_ = clf.best_estimator_.steps[0][1].inverse_transform(coef_)
coef_agglomeration_ = coef_.reshape(size, size)
# Anova univariate feature selection followed by BayesianRidge
f_regression = mem.cache(feature_selection.f_regression) # caching function
anova = feature_selection.SelectPercentile(f_regression)
clf = Pipeline([('anova', anova), ('ridge', ridge)])
# Select the optimal percentage of features with grid search
clf = GridSearchCV(clf, {'anova__percentile': [5, 10, 20]}, cv=cv)
clf.fit(X, y) # set the best parameters
coef_ = clf.best_estimator_.steps[-1][1].coef_
coef_ = clf.best_estimator_.steps[0][1].inverse_transform(coef_.reshape(1, -1))
coef_selection_ = coef_.reshape(size, size)
return dict(
coef_selection_=coef_selection_,
coef_agglomeration_=coef_agglomeration_,
cachedir=cachedir
)
def _do_subject_slice_timing(subject_data, ref_slice=0,
slice_order="ascending", interleaved=False,
caching=True, write_output_images=2,
func_prefix=None, func_basenames=None,
ext=None):
if func_prefix is None:
func_prefix = PREPROC_OUTPUT_IMAGE_PREFICES['STC']
if func_basenames is None:
func_basenames = [get_basenames(func)
for func in subject_data.func]
# prepare for smart caching
if caching:
mem = Memory(cachedir=os.path.join(
subject_data.output_dir, 'cache_dir'), verbose=100)
runner = lambda handle: mem.cache(handle) if caching else handle
stc_output = []
original_bold = subject_data.func
for sess_func, sess_id in zip(subject_data.func,
range(subject_data.n_sessions)):
fmristc = runner(fMRISTC(slice_order=slice_order, ref_slice=ref_slice,
interleaved=interleaved, verbose=True).fit)(
raw_data=sess_func)
stc_output.append(runner(fmristc.transform)(
sess_func,
output_dir=subject_data.tmp_output_dir if (
write_output_images > 0) else None,
basenames=func_basenames[sess_id],
prefix=func_prefix, ext=ext))
subject_data.func = stc_output
del original_bold, fmristc
if write_output_images > 1:
subject_data.hardlink_output_files()
return subject_data
def fit(self, niimgs, y=None):
"""Compute the mask corresponding to the data
Parameters
----------
niimgs: list of filenames or NiImages
Data on which the mask must be calculated. If this is a list,
the affine is considered the same for all.
"""
memory = self.memory
if isinstance(memory, basestring):
memory = Memory(cachedir=memory)
# Load data (if filenames are given, load them)
if self.verbose > 0:
print "[%s.fit] Loading data" % self.__class__.__name__
niimgs = utils.check_niimgs(niimgs, accept_3d=True)
# Compute the mask if not given by the user
if self.mask is None:
if self.verbose > 0:
print "[%s.fit] Computing the mask" % self.__class__.__name__
mask = memory.cache(masking.compute_epi_mask)(
niimgs.get_data(),
connected=self.mask_connected,
opening=self.mask_opening,
lower_cutoff=self.mask_lower_cutoff,
upper_cutoff=self.mask_upper_cutoff,
verbose=(self.verbose - 1),
)
self.mask_ = Nifti1Image(mask.astype(np.int), niimgs.get_affine())
else:
self.mask_ = utils.check_niimg(self.mask)
# If resampling is requested, resample also the mask
# Resampling: allows the user to change the affine, the shape or both
if self.verbose > 0:
print "[%s.transform] Resampling mask" % self.__class__.__name__
self.mask_ = memory.cache(resampling.resample_img)(
self.mask_,
target_affine=self.target_affine,
target_shape=self.target_shape,
copy=(self.target_affine is not None and self.target_shape is not None),
)
return self
def fetch_asirra(image_count=1000):
partial_path = check_fetch_asirra()
m = Memory(cachedir=partial_path, compress=6, verbose=0)
load_func = m.cache(_fetch_asirra)
images, target = load_func(partial_path, image_count=image_count)
return Bunch(data=images.reshape(len(images), -1),
images=images, target=target,
DESCR="Asirra cats and dogs dataset")
def _niigz2nii(self):
"""
Convert .nii.gz to .nii (crucial for SPM).
"""
cache_dir = os.path.join(self.scratch, 'cache_dir')
mem = Memory(cache_dir, verbose=100)
self._sanitize_session_output_dirs()
if not None in [self.func, self.n_sessions, self.session_output_dirs]:
self.func = [
mem.cache(do_niigz2nii)(
self.func[sess], output_dir=self.session_output_dirs[sess])
for sess in range(self.n_sessions)
]
if not self.anat is None:
self.anat = mem.cache(do_niigz2nii)(
self.anat, output_dir=self.anat_output_dir)
def get_multilabel(self):
cache = Memory(cachedir=tempfile.gettempdir())
cached_func = cache.cache(make_multilabel_classification)
return cached_func(n_samples=100,
n_features=10,
n_classes=5,
n_labels=5,
return_indicator=True,
random_state=1)
def get_all_metadata(config=None, args=None):
if config == None and args == None:
raise Exception('Either config or args need to be not None')
if config == None:
config = get_config(args)
class_meta = read_class_meta(config.dataset.class_meta_file)
attrib_meta_with_name = read_attribute_meta(config.dataset.attrib_meta_file)
attrib_meta = attrib_meta_with_name.drop('class_name',axis=1)
train_annos = read_image_annotations(config.dataset.train_annos_file)
test_annos = read_image_annotations(config.dataset.test_annos_file,
has_class_id=False)
domain_meta = read_domain_meta(config.dataset.domain_meta_file)
train_annos['class_name'] = np.array([class_meta.class_name[class_index] for
class_index in
train_annos.class_index])
# test_annos['class_name'] = np.array([class_meta.class_name[class_index] for
# class_index in
# test_annos.class_index])
# Prepand path to the dataset to each img_path
train_annos.img_path = train_annos.img_path.apply(lambda x: config.dataset.main_path.joinpath(x).abspath())
test_annos.img_path = test_annos.img_path.apply(lambda x: config.dataset.main_path.joinpath(x).abspath())
# Filter the class meta and train/test annotations to just use the
# domains defined in config
class_meta = class_meta[class_meta.domain_index.isin(config.dataset.domains)]
train_annos = train_annos[train_annos.domain_index.isin(config.dataset.domains)]
test_annos = test_annos[test_annos.domain_index.isin(config.dataset.domains)]
# Create dev set
dev_annos_train, dev_annos_test = create_dev_set(train_annos,
config)
# Should we use the dev set as the test set
if config.dataset.dev_set.use:
train_used, test_used = dev_annos_train, dev_annos_test
else:
train_used, test_used = train_annos, test_annos
if config.flip_images:
memory = Memory(cachedir=config.cache_dir, verbose=config.logging.verbose)
flip_func = memory.cache(create_flipped_images)
train_used = flip_func(train_used, config)
return ({'real_train_annos': train_annos,
'real_test_annos': test_annos,
'train_annos': train_used,
'test_annos': test_used,
'validation_annos': dev_annos_test,
'class_meta': class_meta,
'domain_meta': domain_meta,
'attrib_meta': attrib_meta,
'attrib_meta_with_name': attrib_meta_with_name},
config)
def cache(func, memory, ref_memory_level=2, memory_level=1, **kwargs):
""" Return a joblib.Memory object.
The memory_level determines the level above which the wrapped
function output is cached. By specifying a numeric value for
this level, the user can to control the amount of cache memory
used. This function will cache the function call or not
depending on the cache level.
Parameters
----------
func: function
The function which output is to be cached.
memory: instance of joblib.Memory or string
Used to cache the function call.
ref_memory_level: int
The reference memory_level used to determine if function call must
be cached or not (if memory_level is larger than ref_memory_level
the function is cached)
memory_level: int
The memory_level from which caching must be enabled for the wrapped
function.
kwargs: keyword arguments
The keyword arguments passed to memory.cache
Returns
-------
mem: joblib.MemorizedFunc
object that wraps the function func. This object may be
a no-op, if the requested level is lower than the value given
to _cache()). For consistency, a joblib.Memory object is always
returned.
"""
if ref_memory_level <= memory_level or memory is None:
memory = Memory(cachedir=None)
else:
memory = memory
if isinstance(memory, basestring):
memory = Memory(cachedir=memory)
if not isinstance(memory, memory_classes):
raise TypeError("'memory' argument must be a string or a "
"joblib.Memory object. "
"%s %s was given." % (memory, type(memory)))
if memory.cachedir is None:
warnings.warn("Caching has been enabled (memory_level = %d) "
"but no Memory object or path has been provided"
" (parameter memory). Caching deactivated for "
"function %s." %
(ref_memory_level, func.func_name),
stacklevel=2)
return memory.cache(func, **kwargs)
def _do_subject_coregister(
subject_data, coreg_func_to_anat=True, caching=True,
ext=None, write_output_images=2, func_basenames=None, func_prefix="",
anat_basename=None, anat_prefix="", report=True, verbose=True):
ref_brain = 'func'
src_brain = 'anat'
ref = subject_data.func[0]
src = subject_data.anat
if coreg_func_to_anat:
ref_brain, src_brain = src_brain, ref_brain
ref, src = src, ref
# prepare for smart caching
if caching:
mem = Memory(cachedir=os.path.join(
subject_data.output_dir, 'cache_dir'), verbose=100)
runner = lambda handle: mem.cache(handle) if caching else handle
# estimate realignment (affine) params for coreg
coreg = runner(Coregister(verbose=verbose).fit)(ref, src)
# apply coreg
if coreg_func_to_anat:
if func_basenames is None:
func_basenames = [get_basenames(func)
for func in subject_data.func]
coreg_func = []
for sess_func, sess_id in zip(subject_data.func, range(
subject_data.n_sessions)):
coreg_func.append(runner(coreg.transform)(
sess_func, output_dir=subject_data.tmp_output_dir if (
write_output_images == 2) else None,
basenames=func_basenames[sess_id] if coreg_func_to_anat
else anat_basename, prefix=func_prefix))
subject_data.func = coreg_func
src = load_vols(subject_data.func[0])[0]
else:
if anat_basename is None:
anat_basename = get_basenames(subject_data.anat)
subject_data.anat = runner(coreg.transform)(
subject_data.anat, basename=anat_basename,
output_dir=subject_data.tmp_output_dir if (
write_output_images == 2) else None, prefix=anat_prefix,
ext=ext)
src = subject_data.anat
# generate coregistration QA thumbs
if report:
subject_data.generate_coregistration_thumbnails(
coreg_func_to_anat=coreg_func_to_anat, nipype=False)
del coreg
if write_output_images > 1:
subject_data.hardlink_output_files()
return subject_data
def get_multilabel(self):
cache = Memory(cachedir=tempfile.gettempdir())
cached_func = cache.cache(make_multilabel_classification)
return cached_func(
n_samples=100,
n_features=10,
n_classes=5,
n_labels=5,
return_indicator=True,
random_state=1
)
def _do_subject_realign(subject_data, reslice=True, register_to_mean=False,
caching=True, hardlink_output=True, ext=None,
func_basenames=None, write_output_images=2,
report=True, func_prefix=None, verbose=True):
if register_to_mean:
raise NotImplementedError("Feature pending...")
if func_prefix is None:
func_prefix = PREPROC_OUTPUT_IMAGE_PREFICES['MC']
if func_basenames is None:
func_basenames = [get_basenames(func)
for func in subject_data.func]
# prepare for smart caching
if caching:
mem = Memory(cachedir=os.path.join(
subject_data.output_dir, 'cache_dir'),
verbose=100 if verbose is True else verbose)
else:
mem = Memory(None)
mrimc = MRIMotionCorrection(
n_sessions=subject_data.n_sessions, verbose=verbose)
mrimc = mem.cache(mrimc.fit)(subject_data.func)
mrimc_output = mem.cache(mrimc.transform)(
reslice=reslice,
output_dir=subject_data.scratch if (
write_output_images == 2) else None, ext=ext,
prefix=func_prefix, basenames=func_basenames)
subject_data.func = mrimc_output['realigned_images']
subject_data.realignment_parameters = mrimc_output[
'realignment_parameters']
# generate realignment thumbs
if report:
subject_data.generate_realignment_thumbnails(nipype=False)
# garbage collection
del mrimc
if write_output_images > 1:
subject_data.hardlink_output_files(verbose=verbose)
return subject_data
def get_lookalike_people():
m = Memory(cachedir='./cache_data', compress=6, verbose=0)
load_func = m.cache(_get_lookalike_people)
#faces, targets, target_ids = _get_lookalike_people()
faces, targets, target_ids = load_func()
return Bunch(data=faces.reshape(len(faces), -1),
images=faces,
target=target_ids,
target_names=targets,
DESCR="Look Alike People Dataset")
def _do_subject_smooth(subject_data, fwhm, prefix=None,
write_output_images=2, func_basenames=None,
concat=False, caching=True):
if prefix is None:
prefix = PREPROC_OUTPUT_IMAGE_PREFICES['smoothing']
if func_basenames is None:
func_basenames = [get_basenames(func) for func in subject_data.func]
if caching:
mem = Memory(cachedir=os.path.join(
subject_data.output_dir, 'cache_dir'), verbose=100)
sfunc = []
for sess in range(subject_data.n_sessions):
sess_func = subject_data.func[sess]
_tmp = mem.cache(smooth_image)(sess_func,
fwhm)
if write_output_images == 2:
_tmp = mem.cache(save_vols)(
_tmp, subject_data.output_dir, basenames=func_basenames[sess],
prefix=prefix, concat=concat)
sfunc.append(_tmp)
subject_data.func = sfunc
return subject_data
def cache(self, func, func_memory_level, **kwargs):
""" Return a joblib.Memory object if necessary (depends on memory_level)
The memory_level is a rough estimator of the amount of memory necessary
to cache a function call. By specifying a numeric value for this level,
the user will be able to control more or less the memory used on his
computer. This function will cache the function call or not depending
on the memory level. This is an helper to avoid code pasting.
Parameters
----------
self: python object
The object containing information about caching. It must have a
memory attribute (used if caching is necessary) and an integer
memory_level attribute to determine if the function must be cached
or not.
func: python function
The function that may be cached
func_memory_level: integer
The memory_level from which caching must be enabled.
Returns
-------
Either the original function (if there is no need to cache it) or a
joblib.Memory object that will be used to cache the function call.
"""
# if memory level is 0 but a memory object is provided, put memory_level
# to 1 with a warning
if self.memory_level == 0:
if hasattr(self, 'memory') and self.memory is not None \
and (isinstance(self.memory, basestring)
or self.memory.cachedir is not None):
warnings.warn("memory_level is set to 0 but a Memory object has"
" been provided. Setting memory_level to 1.")
self.memory_level = 1
if self.memory_level < func_memory_level:
return func
else:
memory = self.memory
if isinstance(memory, basestring):
memory = Memory(cachedir=memory)
if memory.cachedir is None:
warnings.warn("Caching has been enabled (memory_level = %d) but no"
" Memory object or path has been provided (parameter"
" memory). Caching canceled for function %s." %
(self.memory_level, func.func_name))
return memory.cache(func, **kwargs)
def fit(self, data, Y=None):
if hasattr(data, 'copy'):
# It's an array
data = data.copy()
else:
# Probably a list
data = copy.deepcopy(data)
memory = self.memory
if isinstance(memory, basestring):
memory = Memory(cachedir=memory)
pcas = Parallel(n_jobs=self.n_jobs, verbose=self.verbose)(
delayed(subject_pca)(
subject_data, n_components=self.n_components, mem=memory)
for subject_data in data)
pcas = np.concatenate(pcas, axis=1)
if self.kurtosis_thr is None:
group_maps = memory.cache(randomized_svd)(pcas,
self.n_components)[0]
group_maps = group_maps[:, :self.n_components]
ica_maps = memory.cache(fastica)(group_maps,
whiten=False,
fun='cube',
random_state=self.random_state)[2]
ica_maps = ica_maps.T
else:
ica_maps = self._find_high_kurtosis(pcas, memory)
del pcas
self.maps_ = ica_maps
if not self.maps_only:
# Relearn the time series
self.learn_from_maps(data)
return self
def fit(self, data, Y=None):
if hasattr(data, 'copy'):
# It's an array
data = data.copy()
else:
# Probably a list
data = copy.deepcopy(data)
memory = self.memory
if isinstance(memory, basestring):
memory = Memory(cachedir=memory)
pcas = Parallel(n_jobs=self.n_jobs, verbose=self.verbose)(
delayed(subject_pca)(subject_data,
n_components=self.n_components, mem=memory)
for subject_data in data)
pcas = np.concatenate(pcas, axis=1)
if self.kurtosis_thr is None:
group_maps = memory.cache(randomized_svd)(
pcas, self.n_components)[0]
group_maps = group_maps[:, :self.n_components]
ica_maps = memory.cache(fastica)(group_maps, whiten=False,
fun='cube',
random_state=self.random_state)[2]
ica_maps = ica_maps.T
else:
ica_maps = self._find_high_kurtosis(pcas, memory)
del pcas
self.maps_ = ica_maps
if not self.maps_only:
# Relearn the time series
self.learn_from_maps(data)
return self
def motion_correction_pypreprocess(in_file,
out_path,
force_mean_reference,
extra_params={}):
"""
an attempt at motion correction using pypreprocess package.
inputs:
in_file: path to the input file or input file loaded as an nibabel image.
out_path: path to the future output file
force_mean_reference: if evaluated True, adjust motion according to the
mean image; otherwise adjust to the first volume.
extra_params: extra parameters to MRIMotionCorrection
return: the motion corrected image
"""
if force_mean_reference: # calculate the mean and insert to the front
print('motion correction referenced to mean!')
in_file = math_img('np.insert(img, 0, np.mean(img, axis=-1), axis=3)',
img=in_file)
else:
print('motion correction referenced to the first slice.')
# instantiate realigner
if 'MRIMotionCorrection' in extra_params:
print 'extra parameters are used for MRIMotionCorrection: %s' % extra_params[
'MRIMotionCorrection']
mrimc = MRIMotionCorrection(**extra_params['MRIMotionCorrection'])
else:
mrimc = MRIMotionCorrection()
# fit realigner
if USE_CACHE:
mem = Memory("func_preproc_cache")
mrimc = mem.cache(mrimc.fit)(in_file)
else:
mrimc = mrimc.fit(in_file)
# write realigned files to disk
result = mrimc.transform(concat=True)['realigned_images'][0]
if force_mean_reference: # remove the first frame, which was the mean
result = math_img('img[...,1:]', img=result)
if out_path:
nib.save(result, out_path)
return result
def fit(self, X, y=None, get_rhos=False):
'''
Sets up for divergence estimation "from" new data "to" X.
Builds FLANN indices for each bag, and maybe gets within-bag distances.
Parameters
----------
X : list of arrays or :class:`skl_groups.features.Features`
The bags to search "to".
get_rhos : boolean, optional, default False
Compute within-bag distances :attr:`rhos_`. These are only needed
for some divergence functions or if do_sym is passed, and they'll
be computed (and saved) during :meth:`transform` if they're not
computed here.
If you're using Jensen-Shannon divergence, a higher max_K may
be needed once it sees the number of points in the transformed bags,
so the computation here might be wasted.
'''
self.features_ = X = as_features(X, stack=True, bare=True)
# if we're using a function that needs to pick its K vals itself,
# then we need to set max_K here. when we transform(), might have to
# re-do this :|
Ks = self._get_Ks()
_, _, _, max_K, save_all_Ks, _ = _choose_funcs(self.div_funcs, Ks,
X.dim, X.n_pts, None,
self.version)
if max_K >= X.n_pts.min():
msg = "asked for K = {}, but there's a bag with only {} points"
raise ValueError(msg.format(max_K, X.n_pts.min()))
memory = self.memory
if isinstance(memory, string_types):
memory = Memory(cachedir=memory, verbose=0)
self.indices_ = id = memory.cache(_build_indices)(X,
self._flann_args())
if get_rhos:
self.rhos_ = _get_rhos(X, id, Ks, max_K, save_all_Ks,
self.min_dist)
elif hasattr(self, 'rhos_'):
del self.rhos_
return self
def fit(self, X, y=None, get_rhos=False):
'''
Sets up for divergence estimation "from" new data "to" X.
Builds FLANN indices for each bag, and maybe gets within-bag distances.
Parameters
----------
X : list of arrays or :class:`skl_groups.features.Features`
The bags to search "to".
get_rhos : boolean, optional, default False
Compute within-bag distances :attr:`rhos_`. These are only needed
for some divergence functions or if do_sym is passed, and they'll
be computed (and saved) during :meth:`transform` if they're not
computed here.
If you're using Jensen-Shannon divergence, a higher max_K may
be needed once it sees the number of points in the transformed bags,
so the computation here might be wasted.
'''
self.features_ = X = as_features(X, stack=True, bare=True)
# if we're using a function that needs to pick its K vals itself,
# then we need to set max_K here. when we transform(), might have to
# re-do this :|
Ks = self._get_Ks()
_, _, _, max_K, save_all_Ks, _ = _choose_funcs(
self.div_funcs, Ks, X.dim, X.n_pts, None, self.version)
if max_K >= X.n_pts.min():
msg = "asked for K = {}, but there's a bag with only {} points"
raise ValueError(msg.format(max_K, X.n_pts.min()))
memory = self.memory
if isinstance(memory, string_types):
memory = Memory(cachedir=memory, verbose=0)
self.indices_ = id = memory.cache(_build_indices)(X, self._flann_args())
if get_rhos:
self.rhos_ = _get_rhos(X, id, Ks, max_K, save_all_Ks, self.min_dist)
elif hasattr(self, 'rhos_'):
del self.rhos_
return self
def transform(self, X):
r'''
Computes the divergences from X to :attr:`features_`.
Parameters
----------
X : list of bag feature arrays or :class:`skl_groups.features.Features`
The bags to search "from".
Returns
-------
divs : array of shape ``[len(div_funcs), len(Ks), len(X), len(features_)] + ([2] if do_sym else [])``
The divergences from X to :attr:`features_`.
``divs[d, k, i, j]`` is the ``div_funcs[d]`` divergence
from ``X[i]`` to ``fetaures_[j]`` using a K of ``Ks[k]``.
If ``do_sym``, ``divs[d, k, i, j, 0]`` is
:math:`D_{d,k}( X_i \| \texttt{features_}_j)` and
``divs[d, k, i, j, 1]`` is :math:`D_{d,k}(\texttt{features_}_j \| X_i)`.
'''
X = as_features(X, stack=True, bare=True)
Y = self.features_
Ks = np.asarray(self.Ks)
if X.dim != Y.dim:
msg = "incompatible dimensions: fit with {}, transform with {}"
raise ValueError(msg.format(Y.dim, X.dim))
memory = self.memory
if isinstance(memory, string_types):
memory = Memory(cachedir=memory, verbose=0)
# ignore Y_indices to avoid slow pickling of them
# NOTE: if the indices are approximate, then might not get the same
# results!
est = memory.cache(_est_divs, ignore=['n_jobs', 'Y_indices', 'Y_rhos'])
output, self.rhos_ = est(
X, Y, self.indices_, getattr(self, 'rhos_', None),
self.div_funcs, Ks,
self.do_sym, self.clamp, self.version, self.min_dist,
self._flann_args(), self._n_jobs)
return output
def transform(self, X):
r'''
Computes the divergences from X to :attr:`features_`.
Parameters
----------
X : list of bag feature arrays or :class:`skl_groups.features.Features`
The bags to search "from".
Returns
-------
divs : array of shape ``[len(div_funcs), len(Ks), len(X), len(features_)] + ([2] if do_sym else [])``
The divergences from X to :attr:`features_`.
``divs[d, k, i, j]`` is the ``div_funcs[d]`` divergence
from ``X[i]`` to ``fetaures_[j]`` using a K of ``Ks[k]``.
If ``do_sym``, ``divs[d, k, i, j, 0]`` is
:math:`D_{d,k}( X_i \| \texttt{features_}_j)` and
``divs[d, k, i, j, 1]`` is :math:`D_{d,k}(\texttt{features_}_j \| X_i)`.
'''
X = as_features(X, stack=True, bare=True)
Y = self.features_
Ks = np.asarray(self.Ks)
if X.dim != Y.dim:
msg = "incompatible dimensions: fit with {}, transform with {}"
raise ValueError(msg.format(Y.dim, X.dim))
memory = self.memory
if isinstance(memory, string_types):
memory = Memory(cachedir=memory, verbose=0)
# ignore Y_indices to avoid slow pickling of them
# NOTE: if the indices are approximate, then might not get the same
# results!
est = memory.cache(_est_divs, ignore=['n_jobs', 'Y_indices', 'Y_rhos'])
output, self.rhos_ = est(X, Y, self.indices_,
getattr(self, 'rhos_', None), self.div_funcs,
Ks, self.do_sym,
self.clamp, self.version, self.min_dist,
self._flann_args(), self._n_jobs)
return output
def _do_subject_slice_timing(subject_data,
ref_slice=0,
slice_order="ascending",
interleaved=False,
caching=True,
write_output_images=2,
func_prefix=None,
func_basenames=None,
ext=None):
if func_prefix is None:
func_prefix = PREPROC_OUTPUT_IMAGE_PREFICES['STC']
if func_basenames is None:
func_basenames = [get_basenames(func) for func in subject_data.func]
# prepare for smart caching
if caching:
mem = Memory(cachedir=os.path.join(subject_data.output_dir,
'cache_dir'),
verbose=100)
runner = lambda handle: mem.cache(handle) if caching else handle
stc_output = []
original_bold = subject_data.func
for sess_func, sess_id in zip(subject_data.func,
range(subject_data.n_sessions)):
fmristc = runner(
fMRISTC(slice_order=slice_order,
ref_slice=ref_slice,
interleaved=interleaved,
verbose=True).fit)(raw_data=sess_func)
stc_output.append(
runner(fmristc.transform)(sess_func,
output_dir=subject_data.tmp_output_dir if
(write_output_images > 0) else None,
basenames=func_basenames[sess_id],
prefix=func_prefix,
ext=ext))
subject_data.func = stc_output
del original_bold, fmristc
if write_output_images > 1:
subject_data.hardlink_output_files()
return subject_data
def _do_subject_realign(subject_data, reslice=True, register_to_mean=False,
caching=True, hardlink_output=True, ext=None,
func_basenames=None, write_output_images=2,
report=True, func_prefix=None):
if register_to_mean:
raise NotImplementedError("Feature pending...")
if func_prefix is None:
func_prefix = PREPROC_OUTPUT_IMAGE_PREFICES['MC']
if func_basenames is None:
func_basenames = [get_basenames(func)
for func in subject_data.func]
# prepare for smart caching
if caching:
mem = Memory(cachedir=os.path.join(
subject_data.output_dir, 'cache_dir'), verbose=100)
runner = lambda handle: mem.cache(handle) if caching else handle
mrimc = runner(MRIMotionCorrection(
n_sessions=subject_data.n_sessions, verbose=True).fit)(
[sess_func for sess_func in subject_data.func])
mrimc_output = runner(mrimc.transform)(
reslice=reslice,
output_dir=subject_data.tmp_output_dir if (
write_output_images == 2) else None, ext=ext,
prefix=func_prefix, basenames=func_basenames)
subject_data.func = mrimc_output['realigned_images']
subject_data.realignment_parameters = mrimc_output[
'realignment_parameters']
# generate realignment thumbs
if report:
subject_data.generate_realignment_thumbnails(nipype=False)
# garbage collection
del mrimc
if write_output_images > 1:
subject_data.hardlink_output_files()
return subject_data
def fetch_asirra(image_count=1000):
"""
Parameters
----------
image_count : positive integer
Returns
-------
data : Bunch
Dictionary-like object with the following attributes :
'images', the sample images, 'data', the flattened images,
'target', the label for the image (0 for cat, 1 for dog),
and 'DESCR' the full description of the dataset.
"""
partial_path = check_fetch_asirra()
m = Memory(cachedir=partial_path, compress=6, verbose=0)
load_func = m.cache(_fetch_asirra)
images, target = load_func(partial_path, image_count=image_count)
return Bunch(data=images.reshape(len(images), -1),
images=images, target=target,
DESCR="Asirra cats and dogs dataset")
def fetch_asirra(image_count=1000):
"""
Parameters
----------
image_count : positive integer
Returns
-------
data : Bunch
Dictionary-like object with the following attributes :
'images', the sample images, 'data', the flattened images,
'target', the label for the image (0 for cat, 1 for dog),
and 'DESCR' the full description of the dataset.
"""
partial_path = check_fetch_asirra()
m = Memory(cachedir=partial_path, compress=6, verbose=0)
load_func = m.cache(_fetch_asirra)
images, target = load_func(partial_path, image_count=image_count)
return Bunch(data=images.reshape(len(images), -1),
images=images,
target=target,
DESCR="Asirra cats and dogs dataset")
def hdbscan(X, min_cluster_size=5, min_samples=None, alpha=1.0,
metric='minkowski', p=2, leaf_size=40,
algorithm='best', memory=Memory(cachedir=None, verbose=0),
approx_min_span_tree=True, gen_min_span_tree=False,
core_dist_n_jobs=4, allow_single_cluster=False, **kwargs):
"""Perform HDBSCAN clustering from a vector array or distance matrix.
Parameters
----------
X : array or sparse (CSR) matrix of shape (n_samples, n_features), or \
array of shape (n_samples, n_samples)
A feature array, or array of distances between samples if
``metric='precomputed'``.
min_cluster_size : int optional
The minimum number of samples in a group for that group to be
considered a cluster; groupings smaller than this size will be left
as noise.
min_samples : int, optional
The number of samples in a neighborhood for a point
to be considered as a core point. This includes the point itself.
defaults to the min_cluster_size.
alpha : float, optional
A distance scaling parameter as used in robust single linkage.
See (K. Chaudhuri and S. Dasgupta "Rates of convergence
for the cluster tree."). (default 1.0)
metric : string, or callable, optional
The metric to use when calculating distance between instances in a
feature array. If metric is a string or callable, it must be one of
the options allowed by metrics.pairwise.pairwise_distances for its
metric parameter.
If metric is "precomputed", X is assumed to be a distance matrix and
must be square.
(default minkowski)
p : int, optional
p value to use if using the minkowski metric. (default 2)
leaf_size : int, optional
Leaf size for trees responsible for fast nearest
neighbour queries. (default 40)
algorithm : string, optional
Exactly which algorithm to use; hdbscan has variants specialised
for different characteristics of the data. By default this is set
to ``best`` which chooses the "best" algorithm given the nature of
the data. You can force other options if you believe you know
better. Options are:
* ``best``
* ``generic``
* ``prims_kdtree``
* ``prims_balltree``
* ``boruvka_kdtree``
* ``boruvka_balltree``
memory : Instance of joblib.Memory or string (optional)
Used to cache the output of the computation of the tree.
By default, no caching is done. If a string is given, it is the
path to the caching directory.
approx_min_span_tree : Bool, optional
Whether to accept an only approximate minimum spanning tree.
For some algorithms this can provide a significant speedup, but
the resulting clustering may be of marginally lower quality.
If you are willing to sacrifice speed for correctness you may want
to explore this; in general this should be left at the default True.
(default True)
gen_min_span_tree : bool, optional
Whether to generate the minimum spanning tree for later analysis.
(default False)
core_dist_n_jobs : int, optional
Number of parallel jobs to run in core distance computations (if
supported by the specific algorithm).
(default 4)
allow_single_cluster : boolean
By default HDBSCAN* will not produce a single cluster, setting this
to t=True will override this and allow single cluster results in
the case that you feel this is a valid result for your dataset.
(default False)
**kwargs : optional
Arguments passed to the distance metric
Returns
-------
labels : array [n_samples]
Cluster labels for each point. Noisy samples are given the label -1.
probabilities : array [n_samples]
Cluster membership strengths for each point. Noisy samples are assigned
0.
cluster_persistence : array, shape = [n_clusters]
A score of how persistent each cluster is. A score of 1.0 represents
a perfectly stable cluster that persists over all distance scales,
while a score of 0.0 represents a perfectly ephemeral cluster. These
scores can be guage the relative coherence of the clusters output
by the algorithm.
condensed_tree : record array
The condensed cluster hierarchy used to generate clusters.
single_linkage_tree : array [n_samples - 1, 4]
The single linkage tree produced during clustering in scipy
hierarchical clustering format
(see http://docs.scipy.org/doc/scipy/reference/cluster.hierarchy.html).
min_spanning_tree : array [n_samples - 1, 3]
The minimum spanning as an edgelist. If gen_min_span_tree was False
this will be None.
References
----------
R. Campello, D. Moulavi, and J. Sander, "Density-Based Clustering Based on
Hierarchical Density Estimates"
In: Advances in Knowledge Discovery and Data Mining, Springer, pp 160-172.
2013
"""
if min_samples is None:
min_samples = min_cluster_size
if type(min_samples) is not int or type(min_cluster_size) is not int:
raise ValueError('Min samples and min cluster size must be integers!')
if min_samples <= 0 or min_cluster_size <= 0:
raise ValueError('Min samples and Min cluster size must be positive integers')
if alpha <= 0.0 or type(alpha) is int:
raise ValueError('Alpha must be a positive value greater than 0!')
if leaf_size < 1:
raise ValueError('Leaf size must be greater than 0!')
# Checks input and converts to an nd-array where possible
X = check_array(X, accept_sparse='csr')
# Python 2 and 3 compliant string_type checking
if isinstance(memory, six.string_types):
memory = Memory(cachedir=memory, verbose=0)
if algorithm != 'best':
if algorithm == 'generic':
(single_linkage_tree,
result_min_span_tree) = \
memory.cache(_hdbscan_generic)(X, min_samples, alpha, metric,
p, leaf_size, gen_min_span_tree, **kwargs)
elif algorithm == 'prims_kdtree':
if metric not in KDTree.valid_metrics:
raise ValueError("Cannot use Prim's with KDTree for this metric!")
(single_linkage_tree,
result_min_span_tree) = \
memory.cache(_hdbscan_prims_kdtree)(X, min_samples, alpha,
metric, p, leaf_size,
gen_min_span_tree, **kwargs)
elif algorithm == 'prims_balltree':
if metric not in BallTree.valid_metrics:
raise ValueError("Cannot use Prim's with BallTree for this metric!")
(single_linkage_tree,
result_min_span_tree) = \
memory.cache(_hdbscan_prims_balltree)(X, min_samples, alpha,
metric, p, leaf_size,
gen_min_span_tree, **kwargs)
elif algorithm == 'boruvka_kdtree':
if metric not in BallTree.valid_metrics:
raise ValueError("Cannot use Boruvka with KDTree for this metric!")
(single_linkage_tree,
result_min_span_tree) = \
memory.cache(_hdbscan_boruvka_kdtree)(X, min_samples, alpha,
metric, p, leaf_size,
approx_min_span_tree,
gen_min_span_tree,
core_dist_n_jobs, **kwargs)
elif algorithm == 'boruvka_balltree':
if metric not in BallTree.valid_metrics:
raise ValueError("Cannot use Boruvka with BallTree for this metric!")
(single_linkage_tree,
result_min_span_tree) = \
memory.cache(_hdbscan_boruvka_balltree)(X, min_samples, alpha,
metric, p, leaf_size,
approx_min_span_tree,
gen_min_span_tree,
core_dist_n_jobs, **kwargs)
else:
raise TypeError('Unknown algorithm type %s specified' % algorithm)
else:
if issparse(X) or metric not in FAST_METRICS: # We can't do much with sparse matrices ...
(single_linkage_tree,
result_min_span_tree) = \
memory.cache(_hdbscan_generic)(X, min_samples,
alpha, metric, p, leaf_size,
gen_min_span_tree, **kwargs)
elif metric in KDTree.valid_metrics:
#TO DO: Need heuristic to decide when to go to boruvka; still debugging for now
if X.shape[1] > 60:
(single_linkage_tree,
result_min_span_tree) = \
memory.cache(_hdbscan_prims_kdtree)(X, min_samples, alpha,
metric, p, leaf_size,
gen_min_span_tree, **kwargs)
else:
(single_linkage_tree,
result_min_span_tree) = \
memory.cache(_hdbscan_boruvka_kdtree)(X, min_samples, alpha,
metric, p, leaf_size,
approx_min_span_tree,
gen_min_span_tree,
core_dist_n_jobs, **kwargs)
else: # Metric is a valid BallTree metric
# TO DO: Need heuristic to decide when to go to boruvka; still debugging for now
if X.shape[1] > 60:
(single_linkage_tree,
result_min_span_tree) = \
memory.cache(_hdbscan_prims_kdtree)(X, min_samples, alpha,
metric, p, leaf_size,
gen_min_span_tree, **kwargs)
else:
(single_linkage_tree,
result_min_span_tree) = \
memory.cache(_hdbscan_boruvka_balltree)(X, min_samples, alpha,
metric, p, leaf_size,
approx_min_span_tree,
gen_min_span_tree,
core_dist_n_jobs, **kwargs)
return _tree_to_labels(X,
single_linkage_tree,
min_cluster_size,
allow_single_cluster) + (result_min_span_tree,)
t_r=2.5,
standardize=True,
memory='nilearn_cache',
memory_level=1,
verbose=2)
masker.fit()
subject_time_series = []
func_filenames = adhd_dataset.func
confound_filenames = adhd_dataset.confounds
for func_filename, confound_filename in zip(func_filenames,
confound_filenames):
print("Processing file %s" % func_filename)
# Computing some confounds
hv_confounds = mem.cache(image.high_variance_confounds)(func_filename)
region_ts = masker.transform(func_filename,
confounds=[hv_confounds, confound_filename])
subject_time_series.append(region_ts)
##############################################################################
# Computing group-sparse precision matrices
from nilearn.connectome import GroupSparseCovarianceCV
gsc = GroupSparseCovarianceCV(verbose=2)
gsc.fit(subject_time_series)
from sklearn import covariance
gl = covariance.GraphLassoCV(verbose=2)
gl.fit(np.concatenate(subject_time_series))
def robust_single_linkage(X, cut, k=5, alpha=1.4142135623730951,
gamma=5, metric='minkowski', p=2, algorithm='best',
memory=Memory(cachedir=None, verbose=0)):
"""Perform robust single linkage clustering from a vector array
or distance matrix.
Parameters
----------
X : array or sparse (CSR) matrix of shape (n_samples, n_features), or \
array of shape (n_samples, n_samples)
A feature array, or array of distances between samples if
``metric='precomputed'``.
cut : float
The reachability distance value to cut the cluster heirarchy at
to derive a flat cluster labelling.
k : int, optional
Reachability distances will be computed with regard to the `k`
nearest neighbors. (default 5)
alpha : float, optional
Distance scaling for reachability distance computation. Reachability
distance is computed as $max \{ core_k(a), core_k(b), 1/\alpha d(a,b) \}$.
(default sqrt(2))
gamma : int, optional
Ignore any clusters in the flat clustering with size less than gamma,
and declare points in such clusters as noise points. (default 5)
metric : string, or callable, optional
The metric to use when calculating distance between instances in a
feature array. If metric is a string or callable, it must be one of
the options allowed by metrics.pairwise.pairwise_distances for its
metric parameter.
If metric is "precomputed", X is assumed to be a distance matrix and
must be square.
algorithm : string, optional
Exactly which algorithm to use; hdbscan has variants specialised
for different characteristics of the data. By default this is set
to ``best`` which chooses the "best" algorithm given the nature of
the data. You can force other options if you believe you know
better. Options are:
* ``generic``
* ``best``
* ``prims_kdtree``
* ``prims_balltree``
* ``boruvka_kdtree``
* ``boruvka_balltree``
memory : Instance of joblib.Memory or string (optional)
Used to cache the output of the computation of the tree.
By default, no caching is done. If a string is given, it is the
path to the caching directory.
Returns
-------
labels : array [n_samples]
Cluster labels for each point. Noisy samples are given the label -1.
single_linkage_tree : array [n_samples - 1, 4]
The single linkage tree produced during clustering in scipy
hierarchical clustering format
(see http://docs.scipy.org/doc/scipy/reference/cluster.hierarchy.html).
References
----------
K. Chaudhuri and S. Dasgupta.
"Rates of convergence for the cluster tree."
In Advances in Neural Information Processing Systems, 2010.
"""
if type(k) is not int or k < 1:
raise ValueError('k must be an integer greater than zero!')
if type(alpha) is not float or alpha < 1.0:
raise ValueError('alpha must be a float greater than or equal to 1.0!')
if type(gamma) is not int or gamma < 1:
raise ValueError('gamma must be an integer greater than zero!')
X = check_array(X, accept_sparse='csr')
if isinstance(memory, six.string_types):
memory = Memory(cachedir=memory, verbose=0)
if algorithm != 'best':
if algorithm == 'generic':
single_linkage_tree = \
memory.cache(_rsl_generic)(X, k, alpha, metric, p)
elif algorithm == 'prims_kdtree':
single_linkage_tree = \
memory.cache(_rsl_prims_kdtree)(X, k, alpha, metric, p)
elif algorithm == 'prims_balltree':
single_linkage_tree = \
memory.cache(_rsl_prims_balltree)(X, k, alpha, metric, p)
elif algorithm == 'boruvka_kdtree':
single_linkage_tree = \
memory.cache(_rsl_boruvka_kdtree)(X, k, alpha, metric, p)
elif algorithm == 'boruvka_balltree':
single_linkage_tree = \
memory.cache(_rsl_boruvka_balltree)(X, k, alpha, metric, p)
else:
raise TypeError('Unknown algorithm type %s specified' % algorithm)
else:
if issparse(X) or metric not in FAST_METRICS: # We can't do much with sparse matrices ...
single_linkage_tree = \
memory.cache(_rsl_generic)(X, k, alpha, metric, p)
elif metric in KDTree.valid_metrics:
# Need heuristic to decide when to go to boruvka; still debugging for now
if X.shape[1] > 128:
single_linkage_tree = \
memory.cache(_rsl_prims_kdtree)(X, k, alpha, metric, p)
else:
single_linkage_tree = \
memory.cache(_rsl_boruvka_kdtree)(X, k, alpha, metric, p)
else: # Metric is a valid BallTree metric
# Need heuristic to decide when to go to boruvka; still debugging for now
if X.shape[1] > 128:
single_linkage_tree = \
memory.cache(_rsl_prims_kdtree)(X, k, alpha, metric, p)
else:
single_linkage_tree = \
memory.cache(_rsl_boruvka_balltree)(X, k, alpha, metric, p)
labels = single_linkage_tree.get_clusters(cut, gamma)
return labels, single_linkage_tree
import nilearn.input_data
from sklearn.externals.joblib import Memory
mem = Memory('nilearn_cache')
masker = nilearn.input_data.NiftiMapsMasker(
msdl_atlas_dataset.maps, resampling_target="maps", detrend=True,
low_pass=None, high_pass=0.01, t_r=2.5, standardize=True,
memory=mem, memory_level=1, verbose=2)
masker.fit()
fmri_filename = adhd_dataset.func[0]
confound_filename = adhd_dataset.confounds[0]
# Computing some confounds
hv_confounds = mem.cache(nilearn.image.high_variance_confounds)(
fmri_filename)
time_series = masker.transform(fmri_filename,
confounds=[hv_confounds, confound_filename])
print("-- Computing graph-lasso inverse matrix ...")
from sklearn import covariance
gl = covariance.GraphLassoCV(verbose=2)
gl.fit(time_series)
# Displaying results ##########################################################
atlas_imgs = image.iter_img(msdl_atlas_dataset.maps)
atlas_region_coords = [plotting.find_xyz_cut_coords(img) for img in atlas_imgs]
title = "GraphLasso"
def _do_fmri_distortion_correction(
subject_data,
# i'm unsure of the readout time,
# but this is constant across both PE
# directions and so can be scaled to 1
# (or any other nonzero float)
protocol="MOTOR",
readout_time=.01392,
realign=True,
coregister=True,
coreg_func_to_anat=True,
dc=True,
segment=False,
normalize=False,
func_write_voxel_sizes=None,
anat_write_voxel_sizes=None,
report=False,
**kwargs):
"""
Function to undistort task fMRI data for a given HCP subject.
"""
directions = ['LR', 'RL']
subject_data.sanitize()
if dc:
acq_params = [[1, 0, 0, readout_time], [-1, 0, 0, readout_time]]
acq_params_file = os.path.join(subject_data.output_dir,
"b0_acquisition_params.txt")
np.savetxt(acq_params_file, acq_params, fmt='%f')
fieldmap_files = [
os.path.join(
os.path.dirname(subject_data.func[sess]),
"%s_3T_SpinEchoFieldMap_%s.nii.gz" %
(subject_data.subject_id, directions[sess]))
for sess in xrange(subject_data.n_sessions)
]
sbref_files = [
sess_func.replace(".nii", "_SBRef.nii")
for sess_func in subject_data.func
]
# prepare for smart caching
mem = Memory(os.path.join(subject_data.output_dir, "cache_dir"))
for x in [fieldmap_files, sbref_files, subject_data.func]:
assert len(x) == 2
for y in x:
assert os.path.isfile(y), y
# fslroi
zeroth_fieldmap_files = []
for fieldmap_file in fieldmap_files:
if not os.path.isfile(fieldmap_file):
print "Can't find fieldmap file %s; skipping subject %s" % (
fieldmap_file, subject_data.subject_id)
return
# peel 0th volume of each fieldmap
zeroth_fieldmap_file = os.path.join(
subject_data.output_dir,
"0th_%s" % os.path.basename(fieldmap_file))
fslroi_cmd = "fsl5.0-fslroi %s %s 0 1" % (fieldmap_file,
zeroth_fieldmap_file)
print "\r\nExecuting '%s' ..." % fslroi_cmd
print mem.cache(commands.getoutput)(fslroi_cmd)
zeroth_fieldmap_files.append(zeroth_fieldmap_file)
# merge the 0th volume of both fieldmaps
merged_zeroth_fieldmap_file = os.path.join(
subject_data.output_dir, "merged_with_other_direction_%s" %
(os.path.basename(zeroth_fieldmap_files[0])))
fslmerge_cmd = "fsl5.0-fslmerge -t %s %s %s" % (
merged_zeroth_fieldmap_file, zeroth_fieldmap_files[0],
zeroth_fieldmap_files[1])
print "\r\nExecuting '%s' ..." % fslmerge_cmd
print mem.cache(commands.getoutput)(fslmerge_cmd)
# do topup (learn distortion model)
topup_results_basename = os.path.join(subject_data.output_dir,
"topup_results")
topup_cmd = ("fsl5.0-topup --imain=%s --datain=%s --config=b02b0.cnf "
"--out=%s" % (merged_zeroth_fieldmap_file,
acq_params_file, topup_results_basename))
print "\r\nExecuting '%s' ..." % topup_cmd
print mem.cache(commands.getoutput)(topup_cmd)
# apply learn deformations to absorb distortion
dc_fmri_files = []
for sess in xrange(2):
# merge SBRef + task BOLD for current PE direction
assert len(subject_data.func) == 2, subject_data
fourD_plus_sbref = os.path.join(
subject_data.output_dir,
"sbref_plus_" + os.path.basename(subject_data.func[sess]))
fslmerge_cmd = "fsl5.0-fslmerge -t %s %s %s" % (
fourD_plus_sbref, sbref_files[sess], subject_data.func[sess])
print "\r\nExecuting '%s' ..." % fslmerge_cmd
print mem.cache(commands.getoutput)(fslmerge_cmd)
# realign task BOLD to SBRef
sess_output_dir = subject_data.session_output_dirs[sess]
rfourD_plus_sbref = _do_subject_realign(SubjectData(
func=[fourD_plus_sbref],
output_dir=subject_data.output_dir,
n_sessions=1,
session_output_dirs=[sess_output_dir]),
report=False).func[0]
# apply topup to realigned images
dc_rfourD_plus_sbref = os.path.join(
subject_data.output_dir,
"dc" + os.path.basename(rfourD_plus_sbref))
applytopup_cmd = (
"fsl5.0-applytopup --imain=%s --verbose --inindex=%i "
"--topup=%s --out=%s --datain=%s --method=jac" %
(rfourD_plus_sbref, sess + 1, topup_results_basename,
dc_rfourD_plus_sbref, acq_params_file))
print "\r\nExecuting '%s' ..." % applytopup_cmd
print mem.cache(commands.getoutput)(applytopup_cmd)
# recover undistorted task BOLD
dc_rfmri_file = dc_rfourD_plus_sbref.replace("sbref_plus_", "")
fslroi_cmd = "fsl5.0-fslroi %s %s 1 -1" % (dc_rfourD_plus_sbref,
dc_rfmri_file)
print "\r\nExecuting '%s' ..." % fslroi_cmd
print mem.cache(commands.getoutput)(fslroi_cmd)
# sanity tricks
if dc_rfmri_file.endswith(".nii"):
dc_rfmri_file = dc_rfmri_file + ".gz"
dc_fmri_files.append(dc_rfmri_file)
subject_data.func = dc_fmri_files
if isinstance(subject_data.func, basestring):
subject_data.func = [subject_data.func]
# continue preprocessing
subject_data = do_subject_preproc(
subject_data,
realign=realign,
coregister=coregister,
coreg_anat_to_func=not coreg_func_to_anat,
segment=True,
normalize=False,
report=report)
# ok for GLM now
return subject_data
def run_suject_level1_glm(
subject_data,
readout_time=.01392, # seconds
tr=.72,
dc=True,
hrf_model="Canonical with Derivative",
drift_model="Cosine",
hfcut=100,
regress_motion=True,
slicer='ortho',
cut_coords=None,
threshold=3.,
cluster_th=15,
normalize=True,
fwhm=0.,
protocol="MOTOR",
func_write_voxel_sizes=None,
anat_write_voxel_sizes=None,
**other_preproc_kwargs):
"""
Function to do preproc + analysis for a single HCP subject (task fMRI)
"""
add_regs_files = None
n_motion_regressions = 6
subject_data.n_sessions = 2
subject_data.tmp_output_dir = os.path.join(subject_data.output_dir, "tmp")
if not os.path.exists(subject_data.tmp_output_dir):
os.makedirs(subject_data.tmp_output_dir)
if not os.path.exists(subject_data.output_dir):
os.makedirs(subject_data.output_dir)
mem = Memory(os.path.join(subject_data.output_dir, "cache_dir"),
verbose=100)
# glob design files (.fsf)
subject_data.design_files = [
os.path.join(subject_data.data_dir,
("MNINonLinear/Results/tfMRI_%s_%s/"
"tfMRI_%s_%s_hp200_s4_level1.fsf") %
(protocol, direction, protocol, direction))
for direction in ['LR', 'RL']
]
assert len(subject_data.design_files) == 2
for df in subject_data.design_files:
if not os.path.isfile(df):
return
if 0x0:
subject_data = _do_fmri_distortion_correction(
subject_data,
dc=dc,
fwhm=fwhm,
readout_time=readout_time,
**other_preproc_kwargs)
# chronometry
stats_start_time = pretty_time()
# merged lists
paradigms = []
frametimes_list = []
design_matrices = []
# fmri_files = []
n_scans = []
# for direction, direction_index in zip(['LR', 'RL'], xrange(2)):
for sess in xrange(subject_data.n_sessions):
direction = ['LR', 'RL'][sess]
# glob the design file
# design_file = os.path.join(# _subject_data_dir, "tfMRI_%s_%s" % (
# protocol, direction),
design_file = subject_data.design_files[sess]
# "tfMRI_%s_%s_hp200_s4_level1.fsf" % (
# protocol, direction))
if not os.path.isfile(design_file):
print "Can't find design file %s; skipping subject %s" % (
design_file, subject_data.subject_id)
return
# read the experimental setup
print "Reading experimental setup from %s ..." % design_file
fsl_condition_ids, timing_files, fsl_contrast_ids, contrast_values = \
read_fsl_design_file(design_file)
print "... done.\r\n"
# fix timing filenames
timing_files = [
tf.replace("EVs", "tfMRI_%s_%s/EVs" % (protocol, direction))
for tf in timing_files
]
# make design matrix
print "Constructing design matrix for direction %s ..." % direction
_n_scans = nibabel.load(subject_data.func[sess]).shape[-1]
n_scans.append(_n_scans)
add_regs_file = add_regs_files[
sess] if not add_regs_files is None else None
design_matrix, paradigm, frametimes = make_dmtx_from_timing_files(
timing_files,
fsl_condition_ids,
n_scans=_n_scans,
tr=tr,
hrf_model=hrf_model,
drift_model=drift_model,
hfcut=hfcut,
add_regs_file=add_regs_file,
add_reg_names=[
'Translation along x axis', 'Translation along yaxis',
'Translation along z axis', 'Rotation along x axis',
'Rotation along y axis', 'Rotation along z axis',
'Differential Translation along x axis',
'Differential Translation along yaxis',
'Differential Translation along z axis',
'Differential Rotation along x axis',
'Differential Rotation along y axis',
'Differential Rotation along z axis'
][:n_motion_regressions] if not add_regs_files is None else None,
)
print "... done."
paradigms.append(paradigm)
frametimes_list.append(frametimes)
design_matrices.append(design_matrix)
# convert contrasts to dict
contrasts = dict((
contrast_id,
# append zeros to end of contrast to match design
np.hstack((
contrast_value,
np.zeros(len(design_matrix.names) - len(contrast_value)))))
for contrast_id, contrast_value in zip(
fsl_contrast_ids, contrast_values))
# more interesting contrasts
if protocol == 'MOTOR':
contrasts['RH-LH'] = contrasts['RH'] - contrasts['LH']
contrasts['LH-RH'] = -contrasts['RH-LH']
contrasts['RF-LF'] = contrasts['RF'] - contrasts['LF']
contrasts['LF-RF'] = -contrasts['RF-LF']
contrasts['H'] = contrasts['RH'] + contrasts['LH']
contrasts['F'] = contrasts['RF'] + contrasts['LF']
contrasts['H-F'] = contrasts['RH'] + contrasts['LH'] - (
contrasts['RF'] - contrasts['LF'])
contrasts['F-H'] = -contrasts['H-F']
contrasts = dict((k, v) for k, v in contrasts.iteritems() if "-" in k)
# replicate contrasts across sessions
contrasts = dict((cid, [cval] * 2) for cid, cval in contrasts.iteritems())
cache_dir = cache_dir = os.path.join(subject_data.output_dir, 'cache_dir')
if not os.path.exists(cache_dir):
os.makedirs(cache_dir)
nipype_mem = NipypeMemory(base_dir=cache_dir)
if 0x0:
if np.sum(fwhm) > 0.:
subject_data.func = nipype_mem.cache(spm.Smooth)(
in_files=subject_data.func,
fwhm=fwhm,
ignore_exception=False,
).outputs.smoothed_files
# fit GLM
def tortoise(*args):
print args
print(
'Fitting a "Fixed Effect" GLM for merging LR and RL '
'phase-encoding directions for subject %s ...' %
(subject_data.subject_id))
fmri_glm = FMRILinearModel(
subject_data.func,
[design_matrix.matrix for design_matrix in design_matrices],
mask='compute')
fmri_glm.fit(do_scaling=True, model='ar1')
print "... done.\r\n"
# save computed mask
mask_path = os.path.join(subject_data.output_dir, "mask.nii")
print "Saving mask image to %s ..." % mask_path
nibabel.save(fmri_glm.mask, mask_path)
print "... done.\r\n"
z_maps = {}
effects_maps = {}
map_dirs = {}
try:
for contrast_id, contrast_val in contrasts.iteritems():
print "\tcontrast id: %s" % contrast_id
z_map, eff_map = fmri_glm.contrast(contrast_val,
con_id=contrast_id,
output_z=True,
output_effects=True)
# store stat maps to disk
for map_type, out_map in zip(['z', 'effects'],
[z_map, eff_map]):
map_dir = os.path.join(subject_data.output_dir,
'%s_maps' % map_type)
map_dirs[map_type] = map_dir
if not os.path.exists(map_dir):
os.makedirs(map_dir)
map_path = os.path.join(
map_dir, '%s_%s.nii' % (map_type, contrast_id))
print "\t\tWriting %s ..." % map_path
nibabel.save(out_map, map_path)
# collect zmaps for contrasts we're interested in
if map_type == 'z':
z_maps[contrast_id] = map_path
if map_type == 'effects':
effects_maps[contrast_id] = map_path
return effects_maps, z_maps, mask_path, map_dirs
except:
return None
# compute native-space maps and mask
stuff = mem.cache(tortoise)(subject_data.func, subject_data.anat)
if stuff is None:
return None
effects_maps, z_maps, mask_path, map_dirs = stuff
# remove repeated contrasts
contrasts = dict((cid, cval[0]) for cid, cval in contrasts.iteritems())
import json
json.dump(
dict((k, list(v)) for k, v in contrasts.iteritems()),
open(os.path.join(subject_data.tmp_output_dir, "contrasts.json"), "w"))
subject_data.contrasts = contrasts
if normalize:
assert hasattr(subject_data, "parameter_file")
subject_data.native_effects_maps = effects_maps
subject_data.native_z_maps = z_maps
subject_data.native_mask_path = mask_path
# warp effects maps and mask from native to standard space (MNI)
apply_to_files = [
v for _, v in subject_data.native_effects_maps.iteritems()
] + [subject_data.native_mask_path]
tmp = nipype_mem.cache(spm.Normalize)(
parameter_file=getattr(subject_data, "parameter_file"),
apply_to_files=apply_to_files,
write_bounding_box=[[-78, -112, -50], [78, 76, 85]],
write_voxel_sizes=func_write_voxel_sizes,
write_wrap=[0, 0, 0],
write_interp=1,
jobtype='write',
ignore_exception=False,
).outputs.normalized_files
subject_data.mask = hard_link(tmp[-1], subject_data.output_dir)
subject_data.effects_maps = dict(
zip(effects_maps.keys(), hard_link(tmp[:-1], map_dirs["effects"])))
# warp anat image
subject_data.anat = hard_link(
nipype_mem.cache(spm.Normalize)(
parameter_file=getattr(subject_data, "parameter_file"),
apply_to_files=subject_data.anat,
write_bounding_box=[[-78, -112, -50], [78, 76, 85]],
write_voxel_sizes=anat_write_voxel_sizes,
write_wrap=[0, 0, 0],
write_interp=1,
jobtype='write',
ignore_exception=False,
).outputs.normalized_files, subject_data.anat_output_dir)
else:
subject_data.mask = mask_path
subject_data.effects_maps = effects_maps
subject_data.z_maps = z_maps
return subject_data
masker = input_data.NiftiMapsMasker(
msdl_atlas_dataset.maps, resampling_target="maps", detrend=True,
low_pass=None, high_pass=0.01, t_r=2.5, standardize=True,
memory='nilearn_cache', memory_level=1, verbose=2)
masker.fit()
subject_time_series = []
func_filenames = adhd_dataset.func
confound_filenames = adhd_dataset.confounds
for func_filename, confound_filename in zip(func_filenames,
confound_filenames):
print("Processing file %s" % func_filename)
# Computing some confounds
hv_confounds = mem.cache(image.high_variance_confounds)(
func_filename)
region_ts = masker.transform(func_filename,
confounds=[hv_confounds, confound_filename])
subject_time_series.append(region_ts)
##############################################################################
# Computing group-sparse precision matrices
# ------------------------------------------
from nilearn.connectome import GroupSparseCovarianceCV
gsc = GroupSparseCovarianceCV(verbose=2)
gsc.fit(subject_time_series)
from sklearn import covariance
gl = covariance.GraphLassoCV(verbose=2)
def robust_single_linkage(X,
cut,
k=5,
alpha=1.4142135623730951,
gamma=5,
metric='euclidean',
algorithm='best',
memory=Memory(cachedir=None, verbose=0),
leaf_size=40,
core_dist_n_jobs=4,
**kwargs):
"""Perform robust single linkage clustering from a vector array
or distance matrix.
Parameters
----------
X : array or sparse (CSR) matrix of shape (n_samples, n_features), or \
array of shape (n_samples, n_samples)
A feature array, or array of distances between samples if
``metric='precomputed'``.
cut : float
The reachability distance value to cut the cluster heirarchy at
to derive a flat cluster labelling.
k : int, optional (default=5)
Reachability distances will be computed with regard to the `k`
nearest neighbors.
alpha : float, optional (default=np.sqrt(2))
Distance scaling for reachability distance computation. Reachability
distance is computed as
$max \{ core_k(a), core_k(b), 1/\alpha d(a,b) \}$.
gamma : int, optional (default=5)
Ignore any clusters in the flat clustering with size less than gamma,
and declare points in such clusters as noise points.
metric : string, or callable, optional (default='euclidean')
The metric to use when calculating distance between instances in a
feature array. If metric is a string or callable, it must be one of
the options allowed by metrics.pairwise.pairwise_distances for its
metric parameter.
If metric is "precomputed", X is assumed to be a distance matrix and
must be square.
algorithm : string, optional (default='best')
Exactly which algorithm to use; hdbscan has variants specialised
for different characteristics of the data. By default this is set
to ``best`` which chooses the "best" algorithm given the nature of
the data. You can force other options if you believe you know
better. Options are:
* ``generic``
* ``best``
* ``prims_kdtree``
* ``prims_balltree``
* ``boruvka_kdtree``
* ``boruvka_balltree``
memory : Instance of joblib.Memory or string (optional)
Used to cache the output of the computation of the tree.
By default, no caching is done. If a string is given, it is the
path to the caching directory.
leaf_size : int, optional (default=40)
Leaf size for trees responsible for fast nearest
neighbour queries.
core_dist_n_jobs : int, optional
Number of parallel jobs to run in core distance computations (if
supported by the specific algorithm). For ``core_dist_n_jobs``
below -1, (n_cpus + 1 + core_dist_n_jobs) are used.
(default 4)
Returns
-------
labels : ndarray, shape (n_samples, )
Cluster labels for each point. Noisy samples are given the label -1.
single_linkage_tree : ndarray, shape (n_samples - 1, 4)
The single linkage tree produced during clustering in scipy
hierarchical clustering format
(see http://docs.scipy.org/doc/scipy/reference/cluster.hierarchy.html).
References
----------
.. [1] Chaudhuri, K., & Dasgupta, S. (2010). Rates of convergence for the
cluster tree. In Advances in Neural Information Processing Systems
(pp. 343-351).
"""
if not isinstance(k, int) or k < 1:
raise ValueError('k must be an integer greater than zero!')
if not isinstance(alpha, float) or alpha < 1.0:
raise ValueError('alpha must be a float greater than or equal to 1.0!')
if not isinstance(gamma, int) or gamma < 1:
raise ValueError('gamma must be an integer greater than zero!')
if not isinstance(leaf_size, int) or leaf_size < 1:
raise ValueError('Leaf size must be at least one!')
if metric == 'minkowski':
if 'p' not in kwargs or kwargs['p'] is None:
raise TypeError('Minkowski metric given but no p value supplied!')
if kwargs['p'] < 0:
raise ValueError('Minkowski metric with negative p value is not'
' defined!')
X = check_array(X, accept_sparse='csr')
if isinstance(memory, six.string_types):
memory = Memory(cachedir=memory, verbose=0)
if algorithm != 'best':
if algorithm == 'generic':
single_linkage_tree = memory.cache(_rsl_generic)(X, k, alpha,
metric, **kwargs)
elif algorithm == 'prims_kdtree':
single_linkage_tree = memory.cache(_rsl_prims_kdtree)(X, k, alpha,
metric,
**kwargs)
elif algorithm == 'prims_balltree':
single_linkage_tree = memory.cache(_rsl_prims_balltree)(X, k,
alpha,
metric,
**kwargs)
elif algorithm == 'boruvka_kdtree':
single_linkage_tree = \
memory.cache(_rsl_boruvka_kdtree)(X, k, alpha, metric, leaf_size,
core_dist_n_jobs, **kwargs)
elif algorithm == 'boruvka_balltree':
single_linkage_tree = \
memory.cache(_rsl_boruvka_balltree)(X, k, alpha, metric, leaf_size,
core_dist_n_jobs, **kwargs)
else:
raise TypeError('Unknown algorithm type %s specified' % algorithm)
else:
if issparse(X) or metric not in FAST_METRICS:
# We can't do much with sparse matrices ...
single_linkage_tree = memory.cache(_rsl_generic)(X, k, alpha,
metric, **kwargs)
elif metric in KDTree.valid_metrics:
# Need heuristic to decide when to go to boruvka;
# still debugging for now
if X.shape[1] > 128:
single_linkage_tree = memory.cache(_rsl_prims_kdtree)(X, k,
alpha,
metric,
**kwargs)
else:
single_linkage_tree = \
memory.cache(_rsl_boruvka_kdtree)(X, k, alpha, metric,
leaf_size,
core_dist_n_jobs,
**kwargs)
else: # Metric is a valid BallTree metric
# Need heuristic to decide when to go to boruvka;
# still debugging for now
if X.shape[1] > 128:
single_linkage_tree = memory.cache(_rsl_prims_kdtree)(X, k,
alpha,
metric,
**kwargs)
else:
single_linkage_tree = \
memory.cache(_rsl_boruvka_balltree)(X, k, alpha, metric,
leaf_size,
core_dist_n_jobs,
**kwargs)
labels = single_linkage_tree.get_clusters(cut, gamma)
return labels, single_linkage_tree.to_numpy()
# set func
subject_data.func = [x for x in session_func if subject_id in x]
assert len(subject_data.func) == 1
subject_data.func = subject_data.func[0]
# set anat
subject_data.anat = [x for x in session_anat if subject_id in x]
assert len(subject_data.anat) == 1
subject_data.anat = subject_data.anat[0]
# set subject output directory
subject_data.output_dir = "/tmp/%s" % subject_id
subject_data.sanitize(deleteorient=True, niigz2nii=False)
yield (subject_data.subject_id, subject_data.func[0],
subject_data.anat)
# spm auditory demo
mem.cache(_run_demo)(*_spm_auditory_factory())
# NYU rest demo
for subject_id, func, anat in _nyu_rest_factory():
print "%s +++NYU rest %s+++\r\n" % ("\t" * 5, subject_id)
mem.cache(_run_demo)(func, anat)
# ABIDE demo
for subject_id, func, anat in _abide_factory():
print "%s +++ABIDE %s+++\r\n" % ("\t" * 5, subject_id)
mem.cache(_run_demo)(func, anat)
def do_subject_glm(subject_data):
"""FE analysis for a single subject."""
subject_id = subject_data['subject_id']
output_dir = subject_data["output_dir"]
func_files = subject_data['func']
anat = subject_data['anat']
onset_files = subject_data['onset']
# subject_id = os.path.basename(subject_dir)
# subject_output_dir = os.path.join(output_dir, subject_id)
mem = Memory(os.path.join(output_dir, "cache"))
if not os.path.exists(output_dir):
os.makedirs(output_dir)
# glob files: anat, session func files, session onset files
# anat = glob.glob(os.path.join(subject_dir, anat_wildcard))
# assert len(anat) == 1
# anat = anat[0]
# onset_files = sorted([glob.glob(os.path.join(subject_dir, session))[0]
# for session in session_onset_wildcards])
# func_files = sorted([sorted(glob.glob(os.path.join(subject_dir, session)))
# for session in session_func_wildcards])
### Preprocess data #######################################################
if 0:
subject_data = mem.cache(do_subject_preproc)(
dict(func=func_files, anat=anat, output_dir=output_dir))
func_files = subject_data['func']
anat = subject_data['anat']
# reslice func images
func_files = [mem.cache(reslice_vols)(
sess_func,
target_affine=nibabel.load(sess_func[0]).get_affine())
for sess_func in func_files]
### GLM: loop on (session_bold, onse_file) pairs over the various sessions
design_matrices = []
for session, (func_file, onset_file) in enumerate(zip(func_files,
onset_files)):
if isinstance(func_file, str):
bold = nibabel.load(func_file)
else:
if len(func_file) == 1:
func_file = func_file[0]
bold = nibabel.load(func_file)
assert len(bold.shape) == 4
n_scans = bold.shape[-1]
del bold
else:
n_scans = len(func_file)
frametimes = np.linspace(0, (n_scans - 1) * tr, n_scans)
conditions, onsets, durations, amplitudes = parse_onset_file(
onset_file)
onsets *= tr
durations *= tr
paradigm = BlockParadigm(con_id=conditions, onset=onsets,
duration=durations, amplitude=amplitudes)
design_matrices.append(make_dmtx(frametimes,
paradigm, hrf_model=hrf_model,
drift_model=drift_model,
hfcut=hfcut))
# specify contrasts
n_columns = len(design_matrices[0].names)
contrasts = {}
for i in xrange(paradigm.n_conditions):
contrasts['%s' % design_matrices[0].names[2 * i]
] = np.eye(n_columns)[2 * i]
# more interesting contrasts
contrasts['faces-scrambled'] = contrasts['faces'
] - contrasts['scrambled']
contrasts['scrambled-faces'] = -contrasts['faces-scrambled']
contrasts['effects_of_interest'] = contrasts['faces'
] + contrasts['scrambled']
# effects of interest F-test
diff_contrasts = []
for i in xrange(paradigm.n_conditions - 1):
a = contrasts[design_matrices[0].names[2 * i]]
b = contrasts[design_matrices[0].names[2 * (i + 1)]]
diff_contrasts.append(a - b)
contrasts["diff"] = diff_contrasts
# fit GLM
print 'Fitting a GLM (this takes time)...'
fmri_glm = FMRILinearModel([nibabel.concat_images(sess_func,
check_affines=False)
for sess_func in func_files],
[design_matrix.matrix
for design_matrix in design_matrices],
mask='compute'
)
fmri_glm.fit(do_scaling=True, model='ar1')
# save computed mask
mask_path = os.path.join(output_dir, "mask.nii.gz")
print "Saving mask image %s" % mask_path
nibabel.save(fmri_glm.mask, mask_path)
# compute contrasts
z_maps = {}
effects_maps = {}
for contrast_id, contrast_val in contrasts.iteritems():
print "\tcontrast id: %s" % contrast_id
if np.ndim(contrast_val) > 1:
contrast_type = "t"
else:
contrast_type = "F"
z_map, t_map, effects_map, var_map = fmri_glm.contrast(
[contrast_val] * 2,
con_id=contrast_id,
contrast_type=contrast_type,
output_z=True,
output_stat=True,
output_effects=True,
output_variance=True
)
# store stat maps to disk
for map_type, out_map in zip(['z', 't', 'effects', 'variance'],
[z_map, t_map, effects_map, var_map]):
map_dir = os.path.join(
output_dir, '%s_maps' % map_type)
if not os.path.exists(map_dir):
os.makedirs(map_dir)
map_path = os.path.join(
map_dir, '%s.nii.gz' % contrast_id)
print "\t\tWriting %s ..." % map_path
nibabel.save(out_map, map_path)
# collect zmaps for contrasts we're interested in
if map_type == 'z':
z_maps[contrast_id] = map_path
if map_type == 'effects':
effects_maps[contrast_id] = map_path
return subject_id, anat, effects_maps, z_maps, contrasts, fmri_glm.mask
map_dir, '%s.nii.gz' % contrast_id)
print "\t\tWriting %s ..." % map_path
nibabel.save(out_map, map_path)
# collect zmaps for contrasts we're interested in
if map_type == 'z':
z_maps[contrast_id] = map_path
if map_type == 'effects':
effects_maps[contrast_id] = map_path
return subject_id, anat, effects_maps, z_maps, contrasts, fmri_glm.mask
if __name__ == "__main__":
mem = Memory(os.path.join(output_dir, "cache"))
first_level_glms = map(mem.cache(do_subject_glm), subject_dirs)
# plot stats (per subject)
import matplotlib.pyplot as plt
from nilearn.plotting import plot_stat_map
all_masks = []
all_effects_maps = []
for (subject_id, anat, effects_maps, z_maps,
contrasts, mask) in first_level_glms:
all_masks.append(mask)
anat_img = nibabel.load(anat)
z_map = nibabel.load(z_maps.values()[0])
all_effects_maps.append(effects_maps)
for contrast_id, z_map in z_maps.iteritems():
plot_stat_map(z_map, black_bg=True, threshold=2.3,
title="%s: %s" % (subject_id, contrast_id))
class FirstLevelModel(BaseEstimator, TransformerMixin, CacheMixin):
""" Implementation of the General Linear Model for single session fMRI data
Parameters
----------
t_r: float
This parameter indicates repetition times of the experimental runs.
In seconds. It is necessary to correctly consider times in the design
matrix. This parameter is also passed to nilearn.signal.clean.
Please see the related documentation for details.
slice_time_ref: float, optional (default 0.)
This parameter indicates the time of the reference slice used in the
slice timing preprocessing step of the experimental runs. It is
expressed as a percentage of the t_r (time repetition), so it can have
values between 0. and 1.
hrf_model : string, optional
This parameter specifies the hemodynamic response function (HRF) for
the design matrices. It can be 'canonical', 'canonical with derivative'
or 'fir'.
drift_model : string, optional
This parameter specifies the desired drift model for the design
matrices. It can be 'polynomial', 'cosine' or 'blank'.
period_cut : float, optional
This parameter specifies the cut period of the low-pass filter in
seconds for the design matrices.
drift_order : int, optional
This parameter specifices the order of the drift model (in case it is
polynomial) for the design matrices.
fir_delays : array of shape(n_onsets) or list, optional
In case of FIR design, yields the array of delays used in the FIR
model, in seconds.
min_onset : float, optional
This parameter specifies the minimal onset relative to the design
(in seconds). Events that start before (slice_time_ref * t_r +
min_onset) are not considered.
mask: Niimg-like, NiftiMasker or MultiNiftiMasker object, optional,
Mask to be used on data. If an instance of masker is passed,
then its mask will be used. If no mask is given,
it will be computed automatically by a MultiNiftiMasker with default
parameters.
target_affine: 3x3 or 4x4 matrix, optional
This parameter is passed to nilearn.image.resample_img. Please see the
related documentation for details.
target_shape: 3-tuple of integers, optional
This parameter is passed to nilearn.image.resample_img. Please see the
related documentation for details.
smoothing_fwhm: float, optional
If smoothing_fwhm is not None, it gives the size in millimeters of the
spatial smoothing to apply to the signal.
memory: string, optional
Path to the directory used to cache the masking process and the glm
fit. By default, no caching is done. Creates instance of joblib.Memory.
memory_level: integer, optional
Rough estimator of the amount of memory used by caching. Higher value
means more memory for caching.
standardize : boolean, optional
If standardize is True, the time-series are centered and normed:
their variance is put to 1 in the time dimension.
signal_scaling: False, int or (int, int), optional,
If not False, fMRI signals are scaled to the mean value of scaling_axis
given, which can be 0, 1 or (0, 1). 0 refers to mean scaling each voxel
with respect to time, 1 refers to mean scaling each time point with
respect to all voxels and (0, 1) refers to scaling with respect to
voxels and time, which is known as grand mean scaling.
Incompatible with standardize (standardize=False is enforced when
signal_scaling is not False).
noise_model : {'ar1', 'ols'}, optional
The temporal variance model. Defaults to 'ar1'
verbose : integer, optional
Indicate the level of verbosity. By default, nothing is printed.
n_jobs : integer, optional
The number of CPUs to use to do the computation. -1 means
'all CPUs', -2 'all CPUs but one', and so on.
minimize_memory : boolean, optional
Gets rid of some variables on the model fit results that are not
necessary for contrast computation and would only be useful for
further inspection of model details. This has an important impact
on memory consumption. True by default.
Attributes
----------
labels : array of shape (n_voxels,),
a map of values on voxels used to identify the corresponding model
results : dict,
with keys corresponding to the different labels values
values are RegressionResults instances corresponding to the voxels
"""
def __init__(self, t_r=None, slice_time_ref=0., hrf_model='glover',
drift_model='cosine', period_cut=128, drift_order=1,
fir_delays=[0], min_onset=-24, mask=None, target_affine=None,
target_shape=None, smoothing_fwhm=None, memory=Memory(None),
memory_level=1, standardize=False, signal_scaling=0,
noise_model='ar1', verbose=1, n_jobs=1,
minimize_memory=True):
# design matrix parameters
self.t_r = t_r
self.slice_time_ref = slice_time_ref
self.hrf_model = hrf_model
self.drift_model = drift_model
self.period_cut = period_cut
self.drift_order = drift_order
self.fir_delays = fir_delays
self.min_onset = min_onset
# glm parameters
self.mask = mask
self.target_affine = target_affine
self.target_shape = target_shape
self.smoothing_fwhm = smoothing_fwhm
if isinstance(memory, _basestring):
self.memory = Memory(memory)
else:
self.memory = memory
self.memory_level = memory_level
self.standardize = standardize
if signal_scaling in [0, 1, (0, 1)]:
self.scaling_axis = signal_scaling
self.signal_scaling = True
self.standardize = False
elif signal_scaling is False:
self.signal_scaling = signal_scaling
else:
raise ValueError('signal_scaling must be "False", "0", "1"'
' or "(0, 1)"')
self.noise_model = noise_model
self.verbose = verbose
self.n_jobs = n_jobs
self.minimize_memory = minimize_memory
# attributes
self.labels_ = None
self.results_ = None
def fit(self, run_imgs, paradigms=None, confounds=None,
design_matrices=None):
""" Fit the GLM
For each run:
1. create design matrix X
2. do a masker job: fMRI_data -> Y
3. fit regression to (Y, X)
Parameters
----------
run_imgs: Niimg-like object or list of Niimg-like objects,
See http://nilearn.github.io/building_blocks/manipulating_mr_images.html#niimg.
Data on which the GLM will be fitted. If this is a list,
the affine is considered the same for all.
paradigms: pandas Dataframe or string or list of pandas DataFrames or
strings,
fMRI paradigms used to build design matrices. One paradigm expected
per run_img. Ignored in case designs is not None.
confounds: pandas Dataframe or string or list of pandas DataFrames or
strings,
Each column in a DataFrame corresponds to a confound variable
to be included in the regression model of the respective run_img.
The number of rows must match the number of volumes in the
respective run_img. Ignored in case designs is not None.
design_matrices: pandas DataFrame or list of pandas DataFrames,
Design matrices that will be used to fit the GLM.
"""
# Check arguments
# Check imgs type
if not isinstance(run_imgs, (list, tuple)):
run_imgs = [run_imgs]
for rimg in run_imgs:
if not isinstance(rimg, (_basestring, Nifti1Image)):
raise ValueError('run_imgs must be Niimg-like object or list'
' of Niimg-like objects')
# check all information necessary to build design matrices is available
if design_matrices is None:
if paradigms is None:
raise ValueError('paradigms or design matrices must be provided')
if self.t_r is None:
raise ValueError('t_r not given to FirstLevelModel object'
' to compute design from paradigm')
else:
design_matrices = _check_run_tables(run_imgs, design_matrices,
'design_matrices')
# check the number of paradigm and confound files match number of runs
# Also check paradigm and confound files can be loaded as DataFrame
if paradigms is not None:
paradigms = _check_run_tables(run_imgs, paradigms, 'paradigms')
if confounds is not None:
confounds = _check_run_tables(run_imgs, confounds, 'confounds')
# Learn the mask
if not isinstance(self.mask, NiftiMasker):
self.masker_ = NiftiMasker(
mask_img=self.mask, smoothing_fwhm=self.smoothing_fwhm,
target_affine=self.target_affine,
standardize=self.standardize, mask_strategy='epi',
t_r=self.t_r, memory=self.memory,
verbose=max(0, self.verbose - 1),
target_shape=self.target_shape,
memory_level=self.memory_level)
else:
self.masker_ = clone(self.mask)
for param_name in ['target_affine', 'target_shape',
'smoothing_fwhm', 'low_pass', 'high_pass',
't_r', 'memory', 'memory_level']:
our_param = getattr(self, param_name)
if our_param is None:
continue
if getattr(self.masker_, param_name) is not None:
warn('Parameter %s of the masker overriden' % param_name)
setattr(self.masker_, param_name, our_param)
self.masker_.fit(run_imgs[0])
# For each run fit the model and keep only the regression results.
self.labels_, self.results_, self.design_matrices_ = [], [], []
n_runs = len(run_imgs)
t0 = time.time()
for run_idx, run_img in enumerate(run_imgs):
# Report progress
if self.verbose > 0:
percent = float(run_idx) / n_runs
percent = round(percent * 100, 2)
dt = time.time() - t0
# We use a max to avoid a division by zero
if run_idx == 0:
remaining = 'go take a coffee, a big one'
else:
remaining = (100. - percent) / max(0.01, percent) * dt
remaining = '%i seconds remaining' % remaining
sys.stderr.write(" " * 100 + "\r")
sys.stderr.write(
"Computing run %d out of %d runs (%s)\r"
% (run_idx, n_runs, remaining))
# Build the experimental design for the glm
run_img = check_niimg(run_img, ensure_ndim=4)
if design_matrices is None:
n_scans = run_img.get_data().shape[3]
if confounds is not None:
confounds_matrix = confounds[run_idx].values
if confounds_matrix.shape[0] != n_scans:
raise ValueError('Rows in confounds does not match'
'n_scans in run_img at index %d'
% (run_idx,))
confounds_names = confounds[run_idx].columns
else:
confounds_matrix = None
confounds_names = None
start_time = self.slice_time_ref * self.t_r
end_time = (n_scans - 1 + self.slice_time_ref) * self.t_r
frame_times = np.linspace(start_time, end_time, n_scans)
design = make_design_matrix(frame_times, paradigms[run_idx],
self.hrf_model, self.drift_model,
self.period_cut, self.drift_order,
self.fir_delays, confounds_matrix,
confounds_names, self.min_onset)
else:
design = design_matrices[run_idx]
self.design_matrices_.append(design)
# Compute GLM
Y = self.masker_.transform(run_img)
if self.signal_scaling:
Y, _ = mean_scaling(Y, self.scaling_axis)
if self.memory is not None:
mem_glm = self.memory.cache(run_glm)
else:
mem_glm = run_glm
labels, results = mem_glm(Y, design,
noise_model=self.noise_model,
bins=100, n_jobs=self.n_jobs)
self.labels_.append(labels)
# We save memory if inspecting model details is not necessary
if self.minimize_memory:
for key in results:
results[key] = SimpleRegressionResults(results[key])
self.results_.append(results)
del Y
# Report progress
if self.verbose > 0:
sys.stderr.write("\nComputation of %d runs done in %i seconds\n"
% (n_runs, time.time() - t0))
return self
def compute_contrast(self, contrast_def, contrast_name=None,
stat_type=None, output_type='z_score'):
"""Generate different outputs corresponding to
the contrasts provided e.g. z_map, t_map, effects and variance.
In multi-session case, outputs the fixed effects map.
Parameters
----------
contrast_def : array or list of arrays of shape (n_col) or (n_run, n_col)
where ``n_col`` is the number of columns of the design matrix,
(one array per run). If only one array is provided when there
are several runs, it will be assumed that the same contrast is
desired for all runs
contrast_name : str, optional
name of the contrast
stat_type : {'t', 'F'}, optional
type of the contrast
output_type : str, optional
Type of the output map. Can be 'z_score', 'stat', 'p_value',
'effect_size' or 'effect_variance'
Returns
-------
output_image : Nifti1Image
The desired output image
"""
if self.labels_ is None or self.results_ is None:
raise ValueError('The model has not been fit yet')
if isinstance(contrast_def, np.ndarray):
con_vals = [contrast_def]
elif isinstance(contrast_def, (list, tuple)):
con_vals = contrast_def
for cidx, con in enumerate(contrast_def):
if not isinstance(con, np.ndarray):
raise ValueError('contrast_def at index %i is not an'
' array' % cidx)
else:
raise ValueError('contrast_def must be an array or list of arrays')
n_runs = len(self.labels_)
if len(con_vals) != n_runs:
warn('One contrast given, assuming it for all %d runs' % n_runs)
con_vals = con_vals * n_runs
if isinstance(output_type, _basestring):
if output_type not in ['z_score', 'stat', 'p_value', 'effect_size',
'effect_variance']:
raise ValueError('output_type must be one of "z_score", "stat",'
' "p_value","effect_size" or "effect_variance"')
else:
raise ValueError('output_type must be one of "z_score", "stat",'
' "p_value","effect_size" or "effect_variance"')
if self.memory is not None:
arg_ignore = ['labels', 'results']
mem_contrast = self.memory.cache(_fixed_effect_contrast,
ignore=arg_ignore)
else:
mem_contrast = _fixed_effect_contrast
contrast = mem_contrast(self.labels_, self.results_, con_vals,
stat_type)
estimate_ = getattr(contrast, output_type)()
# Prepare the returned images
output = self.masker_.inverse_transform(estimate_)
if contrast_name is None:
contrast_name = str(con_vals)
output.get_header()['descrip'] = (
'%s of contrast %s' % (output_type, contrast_name))
return output
if output_dir is not None:
with open(join(debug_folder, 'score'), 'w+') as f:
f.write('score : %.4f' % score)
return score
output_dir = expanduser(join('~/output/dl_recommender/',
datetime.datetime.now().strftime('%Y-%m-%d_%H'
'-%M-%S')))
os.makedirs(output_dir)
random_state = check_random_state(0)
mem = Memory(cachedir=expanduser("~/cache"), verbose=10)
X_csr = mem.cache(fetch_ml_10m)(expanduser('~/data/own/ml-10M100K'),
remove_empty=True)
permutation = random_state.permutation(X_csr.shape[0])
X_csr = X_csr[permutation]
X, y = array_to_fm_format(X_csr)
uniform_split = ShuffleSplit(n_iter=4,
test_size=.25, random_state=random_state)
fm_decoder = FMDecoder(n_samples=X_csr.shape[0], n_features=X_csr.shape[1])
base_estimator = BaseRecommender(fm_decoder)
convex_fm = ConvexFM(fit_linear=True, alpha=0, max_rank=20,
n_sources, n_times = mean_stc.data.shape
X = np.empty((len(stcs), n_sources, n_times))
for i, stc in enumerate(stcs):
if len(times) == len(stc.times):
X[i] = stc.data
mean_stc._data = np.mean(X, axis=0)
return mean_stc, X
print "Jane here"
#X1, X2 are the full time,vertices,subject matrices; mean_stc1 and mean_stc2 are the grand-avgs
mean_stc1, X1 = average_stcs(stcs1)
mean_stc2, X2 = average_stcs(stcs2)
return mean_stc1, X1, mean_stc2, X2
mean_stc1, X1, mean_stc2, X2 = mem.cache(load_data)(stcs1_fname, stcs2_fname,
dec)
template_stc = copy.deepcopy(mean_stc1)
stc_diff = copy.deepcopy(template_stc)
stc_diff._data = mean_stc2.data - mean_stc1.data ##Stc cond 2- Stc cond 1
stc_diff.save(
'/cluster/kuperberg/SemPrMM/MEG/results/source_space/cluster_stats/' +
prefix + 'diff_of_means')
if time_interval is not None: # squash time interval
tmin, tmax = time_interval
times = mean_stc1.times
mask = (times >= tmin) & (times <= tmax)
X1 = np.mean(X1[:, :, mask], axis=2)[:, :, None]
X2 = np.mean(X2[:, :, mask], axis=2)[:, :, None]
template_stc = copy.deepcopy(template_stc)
def fit(self, X, y=None):
"""Fit the hierarchical clustering on the data
Parameters
----------
X : array-like, shape = [n_samples, n_features]
The samples a.k.a. observations.
Returns
-------
self
"""
X = check_array(X, ensure_min_samples=2, estimator=self)
memory = self.memory
if isinstance(memory, six.string_types):
memory = Memory(cachedir=memory, verbose=0)
if self.n_clusters <= 0:
raise ValueError("n_clusters should be an integer greater than 0."
" %s was provided." % str(self.n_clusters))
if self.linkage == "ward" and self.affinity != "euclidean":
raise ValueError("%s was provided as affinity. Ward can only "
"work with euclidean distances." %
(self.affinity, ))
if self.linkage not in _TREE_BUILDERS:
raise ValueError("Unknown linkage type %s."
"Valid options are %s" %
(self.linkage, _TREE_BUILDERS.keys()))
tree_builder = _TREE_BUILDERS[self.linkage]
connectivity = self.connectivity
if self.connectivity is not None:
if callable(self.connectivity):
connectivity = self.connectivity(X)
connectivity = check_array(connectivity,
accept_sparse=['csr', 'coo', 'lil'])
n_samples = len(X)
compute_full_tree = self.compute_full_tree
if self.connectivity is None:
compute_full_tree = True
if compute_full_tree == 'auto':
# Early stopping is likely to give a speed up only for
# a large number of clusters. The actual threshold
# implemented here is heuristic
compute_full_tree = self.n_clusters < max(100, .02 * n_samples)
n_clusters = self.n_clusters
if compute_full_tree:
n_clusters = None
# Construct the tree
kwargs = {}
if self.linkage != 'ward':
kwargs['linkage'] = self.linkage
kwargs['affinity'] = self.affinity
if self.return_distance:
self.children_, self.n_components_, self.n_leaves_, parents, \
self.distances = \
memory.cache(tree_builder)(X, connectivity,
n_components=self.n_components,
n_clusters=n_clusters,
return_distance=True,
**kwargs)
else:
self.children_, self.n_components_, self.n_leaves_, parents = \
memory.cache(tree_builder)(X, connectivity,
n_components=self.n_components,
n_clusters=n_clusters,
**kwargs)
# Cut the tree
if compute_full_tree:
self.labels_ = _hc_cut(self.n_clusters, self.children_,
self.n_leaves_)
else:
labels = _hierarchical.hc_get_heads(parents, copy=False)
# copy to avoid holding a reference on the original array
labels = np.copy(labels[:n_samples])
# Reasign cluster numbers
self.labels_ = np.searchsorted(np.unique(labels), labels)
return self
