def calc_mv(clf, scorer, regions=None, processes=7, method='sequential'):
n_regions = clf.data[1].shape[0]
if regions is None:
regions = range(0, n_regions)
if processes > 1:
from multiprocessing import Pool
pool = Pool(processes=processes)
else:
pool = itertools
pb = tools.ProgressBar(len(regions), start=True)
overall_results = []
for result in pool.imap(
calc_mv_parallel,
itertools.izip(
itertools.repeat((clf.data, clf.classifier, scorer,
clf.feature_importances, method)), regions)):
pb.next()
for row in result:
overall_results.append(row)
return pd.DataFrame(overall_results,
columns=['score', 'num_features', 'region'])
def calc_mv_classifier(clf, scorer, regions=None, processes=7, method='sequential'):
import os.path as path
from tempfile import mkdtemp
n_regions = clf.data.shape[0]
if regions is None:
regions = range(0, n_regions)
if processes > 1:
from multiprocessing import Pool
pool = Pool(processes=processes)
else:
pool = itertools
pb = tools.ProgressBar(len(regions), start=True)
filename = path.join(mkdtemp(), 'data.dat')
data = np.memmap(filename, dtype='object', mode='w+', shape=clf.comp_dims)
data[:] = clf.data[:]
overall_results = []
for result in pool.imap(calc_mv_parallel_classifier, itertools.izip(itertools.repeat((filename, clf.classifier, scorer,
clf.comp_dims, clf.feature_importances, np.array(clf.feature_names), method)), regions)):
pb.next()
for row in result:
overall_results.append(row)
overall_results = pd.DataFrame(overall_results, columns=['score', 'num_features', 'region', 'feature'])
overall_results.region += 1
return overall_results
def load_data(self, features, X_threshold):
""" Load data into c_data """
from neurosynth.analysis.reduce import average_within_regions
# Load Masks by studies matrix
# ADD FEATURE TO FILTER BY FEATURES
masks_by_studies = average_within_regions(self.dataset, self.mask_img, threshold = self.thresh)
study_ids = self.dataset.feature_table.data.index
print "Loading data from neurosynth..."
pb = tools.ProgressBar(len(list(masks_by_studies)), start=True)
self.ids_by_masks = []
self.data_by_masks = []
for mask in masks_by_studies:
m_ids = study_ids[np.where(mask == True)[0]]
self.ids_by_masks.append(m_ids)
self.data_by_masks.append(self.dataset.get_feature_data(ids=m_ids))
pb.next()
self.mask_num = masks_by_studies.shape[0]
self.mask_pairs = list(itertools.permutations(range(0, self.mask_num), 2))
filename = path.join(mkdtemp(), 'c_data.dat')
self.c_data = np.memmap(filename, dtype='object',
mode='w+', shape=(self.mask_num, self.mask_num))
# Load data
for pair in self.mask_pairs:
reg1_ids = self.ids_by_masks[pair[0]]
reg2_ids = self.ids_by_masks[pair[1]]
reg1_set = list(set(reg1_ids) - set(reg2_ids))
reg2_set = list(set(reg2_ids) - set(reg1_ids))
x1 = self.data_by_masks[pair[0]]
x1 = np.array(x1)[np.where(np.in1d(reg1_ids, reg1_set))[0]]
x2 = self.data_by_masks[pair[1]]
x2 = np.array(x2)[np.where(np.in1d(reg2_ids, reg2_set))[0]]
y = np.array([0]*len(reg1_set) + [1]*len(reg2_set))
X = np.vstack((x1, x2))
if X_threshold is not None:
X = binarize(X, X_threshold)
from neurosynth.analysis.classify import regularize
X = regularize(X, method='scale')
self.c_data[pair] = (X, y)
if self.memsave:
self.data_by_masks = []
self.ids_by_masks = []
def calculate_ns(clf):
mask_pairs = list(itertools.combinations(clf.masklist, 2))
clf.ns = np.ma.masked_array(
np.empty((clf.mask_num, clf.mask_num, 2)), True)
pb = tools.ProgressBar(len(list(mask_pairs)))
for index, n in itertools.imap(get_ns_for_pairs, itertools.izip(itertools.repeat(clf.dataset), mask_pairs, itertools.repeat(clf.thresh))):
clf.ns[index] = n
pb.next()
def bootstrap_mv_full(dataset,
clf,
scorer,
mask,
features=None,
processes=None,
boot_n=100,
method='combinatorial',
outfile=None,
thresh_high=0.05,
thresh_low=0):
from neurosynth.analysis.reduce import average_within_regions
if processes != 1:
from multiprocessing import Pool
pool = Pool(processes=processes)
else:
pool = itertools
pb = tools.ProgressBar(boot_n, start=True)
if method == 'shannons':
cols = ['shannons', 'region', 'boot_n']
else:
cols = ['score', 'num_features', 'feature', 'region', 'boot_n']
X = dataset.get_feature_data(features=features)
y_high = average_within_regions(dataset, mask, threshold=thresh_high)
y_low = average_within_regions(dataset, mask, threshold=thresh_low)
## Get feature names
overall_results = []
for result in pool.imap(
bootstrap_mv_full_parallel,
itertools.izip(
itertools.repeat((X, y_high, y_low, clf, scorer, method)),
range(boot_n))):
pb.next()
print "I exited and I'm tring to save"
if result is not None:
if method != 'shannons':
for row in result:
overall_results.append(row)
else:
overall_results.append(result)
if outfile is not None:
pd.DataFrame(overall_results, columns=cols).to_csv(outfile)
print "Saved"
overall_results = pd.DataFrame(overall_results, columns=cols)
overall_results.region += 1
return overall_results
def bootstrap_mv(clf,
scorer,
regions=None,
processes=None,
boot_n=100,
method='sequential',
outfile=None):
""" This function calculates "complexity curves" for each region in clf. The complexity curves are done on a
boostrapped sample boot_n times """
n_regions = clf.data.shape[0]
if regions is None:
regions = range(0, n_regions)
if processes != 1:
from multiprocessing import Pool
pool = Pool(processes=processes)
else:
pool = itertools
pb = tools.ProgressBar(len(regions) * boot_n, start=True)
if method == 'shannons':
cols = ['shannons', 'region', 'boot_n']
else:
cols = ['score', 'num_features', 'feature', 'region', 'boot_n']
overall_results = []
# Do this for every region sequentially
for i, (X, y) in enumerate(clf.data[regions]):
for result in pool.imap(
bootstrap_mv_parallel,
itertools.izip(
itertools.repeat(
(X, y, clf.classifier, scorer, clf.feature_importances,
np.array(clf.feature_names), method, i)),
range(boot_n))):
pb.next()
if result is not None:
if method != 'shannons':
for row in result:
overall_results.append(row)
else:
overall_results.append(result)
if outfile is not None:
pd.DataFrame(overall_results, columns=cols).to_csv(outfile)
overall_results = pd.DataFrame(overall_results, columns=cols)
overall_results.region += 1
return overall_results
def classify(self, features=None, scoring='accuracy', X_threshold=None, feat_select=None, processes=1, class_weight = 'auto', dummy = None):
self.load_data(features, X_threshold)
self.initalize_containers(features, feat_select, dummy)
print "Classifying..."
pb = tools.ProgressBar(len(list(self.mask_pairs)), start=True)
if processes > 1:
pool = Pool(processes=processes)
else:
pool = itertools
try:
filename = self.c_data.filename
for output in pool.imap(
classify_parallel, itertools.izip(
itertools.repeat((self.classifier, self.param_grid, scoring, filename, feat_select, self.mask_num, class_weight)),
self.mask_pairs)):
index = output['index']
self.class_score[index] = output['score']
if self.memsave is False:
self.fit_clfs[index] = output['clf']
if self.param_grid: # Just get the FIs if you used a grid
try:
self.feature_importances[index] = self.fit_clfs[
index].best_estimator_.coef_[0]
except AttributeError:
try:
self.feature_importances[index] = self.fit_clfs[
index].best_estimator.feature_importances_
except AttributeError:
pass
else:
try:
self.feature_importances[
index] = self.fit_clfs[index].clf.coef_[0]
except AttributeError:
try:
self.feature_importances[index] = self.fit_clfs[
index].clf.feature_importances_
except AttributeError:
pass
if feat_select:
self.features_selected[index] = output['features_selected']
if dummy is not None:
X, y = self.c_data[index]
output = classify.classify(X, y, classifier=DummyClassifier(strategy=dummy), cross_val='4-Fold',
class_weight=class_weight, scoring=scoring, feat_select=feat_select)
self.dummy_score[index] = output['score']
pb.next()
finally:
if processes > 1:
pool.close()
pool.join()
if dummy is None:
self.final_score = self.class_score
else:
self.final_score = self.class_score - self.dummy_score
