def load_spatiotemporal_dataset(ds, **kwargs):
onset = 0
for arg in kwargs:
if (arg == 'onset'):
onset = kwargs[arg]
if (arg == 'duration'):
duration = kwargs[arg]
if (arg == 'enable_results'):
enable_results = kwargs[arg]
events = find_events(targets = ds.sa.targets, chunks = ds.sa.chunks)
#task_events = [e for e in events if e['targets'] in ['Vipassana','Samatha']]
if 'duration' in locals():
events = [e for e in events if e['duration'] >= duration]
else:
duration = np.min([ev['duration'] for ev in events])
for e in events:
e['onset'] += onset
e['duration'] = duration
evds = eventrelated_dataset(ds, events = events)
return evds
def fx(dataset, behav_file, motion_file, polynomial_order, run_number):
print("events -> %s" % behav_file)
print("nuisance -> %s" % motion_file)
tsds = dataset
behav_txt = np.recfromcsv(behav_file, delimiter=',')
events = [
dict(onset=float(event['run_volume']) * 2.0,
duration=6.0,
targets=event['genre'],
chunks=int(event['run']),
stim=event['stim']) for event in behav_txt
]
motion = np.loadtxt(motion_file)
add_reg_names = ['tx', 'ty', 'tz', 'rx', 'ry', 'rz']
hrf_estimates = eventrelated_dataset(
tsds,
events,
model='hrf',
time_attr='time_coords',
condition_attr=(('targets', 'chunks')),
design_kwargs=dict(drift_model='polynomial',
drift_order=polynomial_order,
hrf_model='canonical with derivative',
add_regs=motion,
add_reg_names=add_reg_names),
glmfit_kwargs=dict(model='ar1'))
#hrf_estimates.sa['subj'] = [subject] * len(hrf_estimates)
hrf_estimates.sa['run'] = [run_number] * len(hrf_estimates)
# zscore voxelwise
# XXX `hrf_estimates` has no chunks! hence zscoring is not performed run-wise!
zscore(hrf_estimates)
return hrf_estimates
#bandpass filter
nf = 0.5/TR
ws = [(1/lf)/nf, (1/hf)/nf]
b, a = signal.butter(5, ws, btype='band')
S = [signal.filtfilt(b, a, x) for x in ds.samples.T]
ds.samples = np.array(S).T
ds.samples = ds.samples.astype('float32')
#Create Event-related Dataset
onsets = np.arange(0,ds.nsamples - samples_size/TR, samples_size/TR)
events = []
for on in onsets:
Ev = dict()
Ev['onset'] = on
Ev['duration'] = samples_size / TR
Ev['target'] = on*TR
Ev['subj'] = subj
events.append(Ev)
evds = mvpa.eventrelated_dataset(ds, events=events)
evds.fa['1stidx'] = evds.fa.event_offsetidx==0
#Save pymvpa-dataset as hdf5 in dataset directory
try:
os.mkdir(os.path.join(path,'dataset'))
except:
print 'results directory already exists'
dsfile = subj+'_z'+str(zsc)+'_'+str(samples_size)+'_'+align
mvpa.h5save(os.path.join(path,'dataset',dsfile+'.hdf5'), evds, compression='gzip')
def build_events_ds(ds, new_duration, **kwargs):
"""
This function is used to convert a dataset in a event_related dataset. Used for
transfer learning and clustering, thus a classifier has been trained on a
event related dataset and the prediction should be done on the same kind of the
dataset.
Parameters
----------
ds : Dataset
The dataset to be converted
new_duration : integer
Is the duration of the single event, if experiment events are of different
length, it takes the events greater or equal to new_duration.
kwarsg : dict
win_number: is the number of window of one single event to be extracted,
if it is not setted, it assumes the ratio between event duration and new_duration
overlap:
Returns
-------
Dataset:
the event_related dataset
"""
for arg in kwargs:
if arg == 'win_number':
win_number = kwargs[arg]
if arg == 'overlap':
overlap = kwargs[arg]
events = find_events(targets = ds.sa.targets, chunks = ds.sa.chunks)
labels = np.unique(ds.targets)
current_duration = dict()
for l in labels:
d = [e['duration'] for e in events if e['targets'] == l]
current_duration[l] = np.unique(d)[0]
def calc_overlap(w, l, n):
return w - np.floor((l - w)/(n - 1))
def calc_win_number (w, l, o):
return (l - w)/(w - o) + 1
if 'overlap' not in locals():
overlap = calc_overlap(new_duration, current_duration[l], win_number)
else:
if overlap >= new_duration:
overlap = new_duration - 1
if 'win_number' not in locals():
#win_number = np.ceil(current_duration[l]/np.float(new_duration))
win_number = calc_win_number(new_duration, current_duration[l], overlap)
new_event_list = []
for e in events:
onset = e['onset']
chunks = e['chunks']
targets = e['targets']
duration = e['duration']
for i in np.arange(win_number):
new_onset = onset + i * (new_duration - overlap)
new_event = dict()
new_event['onset'] = new_onset
new_event['duration'] = new_duration
new_event['targets'] = targets
new_event['chunks'] = chunks
new_event_list.append(new_event)
logger.info('Building new event related dataset...')
evds = eventrelated_dataset(ds, events = new_event_list)
return evds
def spatiotemporal(ds, **kwargs):
onset = 0
for arg in kwargs:
if (arg == 'onset'):
onset = kwargs[arg]
if (arg == 'duration'):
duration = kwargs[arg]
if (arg == 'enable_results'):
enable_results = kwargs[arg]
if (arg == 'permutations'):
permutations = int(kwargs[arg])
events = find_events(targets = ds.sa.targets, chunks = ds.sa.chunks)
if 'duration' in locals():
events = [e for e in events if e['duration'] >= duration]
else:
duration = np.min([ev['duration'] for ev in events])
for e in events:
e['onset'] += onset
e['duration'] = duration
evds = eventrelated_dataset(ds, events = events)
[fclf, cvte] = setup_classifier(**kwargs)
logger.info('Cross validation is performing ...')
res = cvte(evds)
print cvte.ca.stats
if permutations != 0:
print cvte.ca.null_prob.samples
dist_len = len(cvte.null_dist.dists())
err_arr = np.zeros(dist_len)
for i in range(dist_len):
err_arr[i] = 1 - cvte.ca.stats.stats['ACC']
total_p_value = np.mean(cvte.null_dist.p(err_arr))
p_value = cvte.ca.null_prob.samples
else:
total_p_value = 0.
p_value = np.array([0,0])
try:
sensana = fclf.get_sensitivity_analyzer()
res_sens = sensana(evds)
except Exception, err:
allowed_keys = ['map', 'sensitivities', 'stats',
'mapper', 'classifier', 'ds',
'perm_pvalue', 'p']
allowed_results = [None, None, cvte.ca.stats,
evds.a.mapper, fclf, evds,
p_value, total_p_value]
results_dict = dict(zip(allowed_keys, allowed_results))
results = dict()
if not 'enable_results' in locals():
enable_results = allowed_keys[:]
for elem in enable_results:
if elem in allowed_keys:
results[elem] = results_dict[elem]
return results
ws = [(1 / lf) / nf, (1 / hf) / nf]
b, a = signal.butter(5, ws, btype='band')
S = [signal.filtfilt(b, a, x) for x in ds.samples.T]
ds.samples = np.array(S).T
ds.samples = ds.samples.astype('float32')
#Create Event-related Dataset
onsets = np.arange(0, ds.nsamples - samples_size / TR, samples_size / TR)
events = []
for on in onsets:
Ev = dict()
Ev['onset'] = on
Ev['duration'] = samples_size / TR
Ev['target'] = on * TR
Ev['subj'] = subj
events.append(Ev)
evds = mvpa.eventrelated_dataset(ds, events=events)
evds.fa['1stidx'] = evds.fa.event_offsetidx == 0
#Save pymvpa-dataset as hdf5 in dataset directory
try:
os.mkdir(os.path.join(path, 'dataset'))
except:
print 'results directory already exists'
dsfile = subj + '_z' + str(zsc) + '_' + str(samples_size) + '_' + align
mvpa.h5save(os.path.join(path, 'dataset', dsfile + '.hdf5'),
evds,
compression='gzip')
