def __init__(self, **kwargs):
_shpaldebug("Initializing.")
ClassWithCollections.__init__(self, **kwargs)
self.ndatasets = 0
self.nfeatures = 0
self.projections = None
# This option makes the roi_seed in each SL to be selected during feature selection
self.force_roi_seed = True
if self.params.nproc is not None and self.params.nproc > 1 \
and not externals.exists('pprocess'):
raise RuntimeError("The 'pprocess' module is required for "
"multiprocess searchlights. Please either "
"install python-pprocess, or reduce `nproc` "
"to 1 (got nproc=%i) or set to default None"
% self.params.nproc)
if not externals.exists('scipy'):
raise RuntimeError("The 'scipy' module is required for "
"searchlight hyperalignment.")
if self.params.results_backend == 'native':
raise NotImplementedError("'native' mode to handle results is still a "
"work in progress.")
#warning("results_backend is set to 'native'. This has been known"
# "to result in longer run time when working with big datasets.")
if self.params.results_backend == 'hdf5' and \
not externals.exists('h5py'):
raise RuntimeError("The 'hdf5' module is required for "
"when results_backend is set to 'hdf5'")
def __init__(self, sd=0, distribution='rdist', fpp=None, nbins=400, **kwargs):
"""L2-Norm the values, convert them to p-values of a given distribution.
Parameters
----------
sd : int
Samples dimension (if len(x.shape)>1) on which to operate
distribution : string
Which distribution to use. Known are: 'rdist' (later normal should
be there as well)
fpp : float
At what p-value (both tails) if not None, to control for false
positives. It would iteratively prune the tails (tentative real positives)
until empirical p-value becomes less or equal to numerical.
nbins : int
Number of bins for the iterative pruning of positives
WARNING: Highly experimental/slow/etc: no theoretical grounds have been
presented in any paper, nor proven
"""
externals.exists('scipy', raise_=True)
ClassWithCollections.__init__(self, **kwargs)
self.sd = sd
if not (distribution in ['rdist']):
raise ValueError, "Actually only rdist supported at the moment" \
" got %s" % distribution
self.distribution = distribution
self.fpp = fpp
self.nbins = nbins
def _acquire_externals(self, out):
# Test and list all dependencies:
sdeps = {True: [], False: [], 'Error': []}
for dep in sorted(externals._KNOWN):
try:
sdeps[externals.exists(dep, force=False)] += [dep]
except:
sdeps['Error'] += [dep]
out.write('EXTERNALS:\n')
out.write(' Present: %s\n' % ', '.join(sdeps[True]))
out.write(' Absent: %s\n' % ', '.join(sdeps[False]))
if len(sdeps['Error']):
out.write(' Errors in determining: %s\n' % ', '.join(sdeps['Error']))
SV = ('.__version__', ) # standard versioning
out.write(' Versions of critical externals:\n')
# First the ones known to externals,
for k, v in sorted(externals.versions.iteritems()):
out.write(' %-12s: %s\n' % (k, str(v)))
try:
if externals.exists('matplotlib'):
import matplotlib
out.write(' Matplotlib backend: %s\n'
% matplotlib.get_backend())
except Exception, exc:
out.write(' Failed to determine backend of matplotlib due to "%s"'
% str(exc))
def __init__(self, generator, queryengine, errorfx=mean_mismatch_error,
indexsum=None,
reuse_neighbors=False,
splitter=None,
**kwargs):
"""Initialize the base class for "naive" searchlight classifiers
Parameters
----------
generator : `Generator`
Some `Generator` to prepare partitions for cross-validation.
It must not change "targets", thus e.g. no AttributePermutator's
errorfx : func, optional
Functor that computes a scalar error value from the vectors of
desired and predicted values (e.g. subclass of `ErrorFunction`).
indexsum : ('sparse', 'fancy'), optional
What use to compute sums over arbitrary columns. 'fancy'
corresponds to regular fancy indexing over columns, whenever
in 'sparse', product of sparse matrices is used (usually
faster, so is default if `scipy` is available).
reuse_neighbors : bool, optional
Compute neighbors information only once, thus allowing for
efficient reuse on subsequent calls where dataset's feature
attributes remain the same (e.g. during permutation testing)
splitter : Splitter, optional
Which will be used to split partitioned datasets. If None specified
then standard one operating on partitions will be used
"""
# init base class first
BaseSearchlight.__init__(self, queryengine, **kwargs)
self._errorfx = errorfx
self._generator = generator
self._splitter = splitter
# TODO: move into _call since resetting over default None
# obscures __repr__
if indexsum is None:
if externals.exists('scipy'):
indexsum = 'sparse'
else:
indexsum = 'fancy'
else:
if indexsum == 'sparse' and not externals.exists('scipy'):
warning("Scipy.sparse isn't available so taking 'fancy' as "
"'indexsum' method.")
indexsum = 'fancy'
self._indexsum = indexsum
if not self.nproc in (None, 1):
raise NotImplementedError, "For now only nproc=1 (or None for " \
"autodetection) is supported by GNBSearchlight"
self.__pb = None # statistics per each block/label
self.__reuse_neighbors = reuse_neighbors
# Storage to be used for neighborhood information
self.__roi_fids = None
def _postcall(self, dataset, result):
"""Some postprocessing on the result
"""
if self.__null_dist is None:
# do base-class postcall and be done
result = super(Measure, self)._postcall(dataset, result)
else:
# don't do a full base-class postcall, only do the
# postproc-application here, to gain result compatibility with the
# fitted null distribution -- necessary to be able to use
# a Node's 'pass_attr' to pick up ca.null_prob
result = self._apply_postproc(dataset, result)
if self.ca.is_enabled('null_t'):
# get probability under NULL hyp, but also request
# either it belong to the right tail
null_prob, null_right_tail = \
self.__null_dist.p(result, return_tails=True)
self.ca.null_prob = null_prob
externals.exists('scipy', raise_=True)
from scipy.stats import norm
# TODO: following logic should appear in NullDist,
# not here
tail = self.null_dist.tail
if tail == 'left':
acdf = np.abs(null_prob.samples)
elif tail == 'right':
acdf = 1.0 - np.abs(null_prob.samples)
elif tail in ['any', 'both']:
acdf = 1.0 - np.clip(np.abs(null_prob.samples), 0, 0.5)
else:
raise RuntimeError, 'Unhandled tail %s' % tail
# We need to clip to avoid non-informative inf's ;-)
# that happens due to lack of precision in mantissa
# which is 11 bits in double. We could clip values
# around 0 at as low as 1e-100 (correspond to z~=21),
# but for consistency lets clip at 1e-16 which leads
# to distinguishable value around p=1 and max z=8.2.
# Should be sufficient range of z-values ;-)
clip = 1e-16
null_t = norm.ppf(np.clip(acdf, clip, 1.0 - clip))
# assure that we deal with arrays:
null_t = np.array(null_t, ndmin=1, copy=False)
null_t[~null_right_tail] *= -1.0 # revert sign for negatives
null_t_ds = null_prob.copy(deep=False)
null_t_ds.samples = null_t
self.ca.null_t = null_t_ds # store as a Dataset
else:
# get probability of result under NULL hypothesis if available
# and don't request tail information
self.ca.null_prob = self.__null_dist.p(result)
# now do the second half of postcall and invoke pass_attr
result = self._pass_attr(dataset, result)
return result
def __init__(self, datameasure, queryengine, add_center_fa=False,
results_backend='native',
results_fx=None,
tmp_prefix='tmpsl',
nblocks=None,
**kwargs):
"""
Parameters
----------
datameasure : callable
Any object that takes a :class:`~mvpa2.datasets.base.Dataset`
and returns some measure when called.
add_center_fa : bool or str
If True or a string, each searchlight ROI dataset will have a boolean
vector as a feature attribute that indicates the feature that is the
seed (e.g. sphere center) for the respective ROI. If True, the
attribute is named 'roi_seed', the provided string is used as the name
otherwise.
results_backend : ('native', 'hdf5'), optional
Specifies the way results are provided back from a processing block
in case of nproc > 1. 'native' is pickling/unpickling of results by
pprocess, while 'hdf5' would use h5save/h5load functionality.
'hdf5' might be more time and memory efficient in some cases.
results_fx : callable, optional
Function to process/combine results of each searchlight
block run. By default it would simply append them all into
the list. It receives as keyword arguments sl, dataset,
roi_ids, and results (iterable of lists). It is the one to take
care of assigning roi_* ca's
tmp_prefix : str, optional
If specified -- serves as a prefix for temporary files storage
if results_backend == 'hdf5'. Thus can specify the directory to use
(trailing file path separator is not added automagically).
nblocks : None or int
Into how many blocks to split the computation (could be larger than
nproc). If None -- nproc is used.
**kwargs
In addition this class supports all keyword arguments of its
base-class :class:`~mvpa2.measures.searchlight.BaseSearchlight`.
"""
BaseSearchlight.__init__(self, queryengine, **kwargs)
self.datameasure = datameasure
self.results_backend = results_backend.lower()
if self.results_backend == 'hdf5':
# Assure having hdf5
externals.exists('h5py', raise_=True)
self.results_fx = Searchlight._concat_results \
if results_fx is None else results_fx
self.tmp_prefix = tmp_prefix
self.nblocks = nblocks
if isinstance(add_center_fa, str):
self.__add_center_fa = add_center_fa
elif add_center_fa:
self.__add_center_fa = 'roi_seed'
else:
self.__add_center_fa = False
def plot(self):
"""Plot correlation coefficients
"""
externals.exists('pylab', raise_=True)
import pylab as pl
pl.plot(self['corrcoef'])
pl.title('Auto-correlation of the sequence')
pl.xlabel('Offset')
pl.ylabel('Correlation Coefficient')
pl.show()
def __init__(self, source):
"""Reader MEG data from texfiles or file-like objects.
Parameters
----------
source : str or file-like
Strings are assumed to be filenames (with `.gz` suffix
compressed), while all other object types are treated as file-like
objects.
"""
self.ntimepoints = None
self.timepoints = None
self.nsamples = None
self.channelids = []
self.data = []
self.samplingrate = None
# open textfiles
if isinstance(source, str):
if source.endswith(".gz"):
externals.exists("gzip", raise_=True)
import gzip
source = gzip.open(source, "r")
else:
source = open(source, "r")
# read file
for line in source:
# split ID
colon = line.find(":")
# ignore lines without id
if colon == -1:
continue
id = line[:colon]
data = line[colon + 1 :].strip()
if id == "Sample Number":
timepoints = np.fromstring(data, dtype=int, sep="\t")
# one more as it starts with zero
self.ntimepoints = int(timepoints.max()) + 1
self.nsamples = int(len(timepoints) / self.ntimepoints)
elif id == "Time":
self.timepoints = np.fromstring(data, dtype=float, count=self.ntimepoints, sep="\t")
self.samplingrate = self.ntimepoints / (self.timepoints[-1] - self.timepoints[0])
else:
# load data
self.data.append(np.fromstring(data, dtype=float, sep="\t").reshape(self.nsamples, self.ntimepoints))
# store id
self.channelids.append(id)
# reshape data from (channels x samples x timepoints) to
# (samples x chanels x timepoints)
self.data = np.swapaxes(np.array(self.data), 0, 1)
def test_externals_correct2nd_invocation(self):
# always fails
externals._KNOWN['checker2'] = 'raise ImportError'
self.assertTrue(not externals.exists('checker2'),
msg="Should be False on 1st invocation")
self.assertTrue(not externals.exists('checker2'),
msg="Should be False on 2nd invocation as well")
externals._KNOWN.pop('checker2')
def plot(self):
"""Plot correlation coefficients
"""
externals.exists("pylab", raise_=True)
import pylab as pl
pl.plot(self["corrcoef"])
pl.title("Auto-correlation of the sequence")
pl.xlabel("Offset")
pl.ylabel("Correlation Coefficient")
pl.show()
def _call(self, dataset):
externals.exists('skl', raise_=True)
from sklearn.linear_model import Lasso, Ridge
from sklearn.preprocessing import scale
# first run PDist
compute_dsm = PDist(pairwise_metric=self.params.pairwise_metric,
center_data=self.params.center_data)
dsm = compute_dsm(dataset)
dsm_samples = dsm.samples
if self.params.rank_data:
dsm_samples = rankdata(dsm_samples)
predictors = np.apply_along_axis(rankdata, 0, self.predictors)
else:
predictors = self.predictors
if self.params.normalize:
predictors = scale(predictors, axis=0)
dsm_samples = scale(dsm_samples, axis=0)
# keep only the item we want
if self.keep_pairs is not None:
dsm_samples = dsm_samples[self.keep_pairs]
predictors = predictors[self.keep_pairs, :]
# check that predictors and samples have the correct dimensions
if dsm_samples.shape[0] != predictors.shape[0]:
raise ValueError('computed dsm has {0} rows, while predictors have'
'{1} rows. Check that predictors have the right'
'shape'.format(dsm_samples.shape[0],
predictors.shape[0]))
# now fit the regression
if self.params.method == 'lasso':
reg = Lasso
elif self.params.method == 'ridge':
reg = Ridge
else:
raise ValueError('I do not know method {0}'.format(self.params.method))
reg_ = reg(alpha=self.params.alpha, fit_intercept=self.params.fit_intercept)
reg_.fit(predictors, dsm_samples)
coefs = reg_.coef_.reshape(-1, 1)
sa = ['coef' + str(i) for i in range(len(coefs))]
if self.params.fit_intercept:
coefs = np.vstack((coefs, reg_.intercept_))
sa += ['intercept']
return Dataset(coefs, sa={'coefs': sa})
def test_externals_no_double_invocation(self):
# no external should be checking twice (unless specified
# explicitely)
class Checker(object):
"""Helper class to increment count of actual checks"""
def __init__(self): self.checked = 0
def check(self): self.checked += 1
checker = Checker()
externals._KNOWN['checker'] = 'checker.check()'
externals.__dict__['checker'] = checker
externals.exists('checker')
self.assertEqual(checker.checked, 1)
externals.exists('checker')
self.assertEqual(checker.checked, 1)
externals.exists('checker', force=True)
self.assertEqual(checker.checked, 2)
externals.exists('checker')
self.assertEqual(checker.checked, 2)
# restore original externals
externals.__dict__.pop('checker')
externals._KNOWN.pop('checker')
def _postcall(self, dataset, result):
"""Some postprocessing on the result
"""
self.ca.raw_results = result
# post-processing
result = super(Measure, self)._postcall(dataset, result)
if not self.__null_dist is None:
if self.ca.is_enabled("null_t"):
# get probability under NULL hyp, but also request
# either it belong to the right tail
null_prob, null_right_tail = self.__null_dist.p(result, return_tails=True)
self.ca.null_prob = null_prob
externals.exists("scipy", raise_=True)
from scipy.stats import norm
# TODO: following logic should appear in NullDist,
# not here
tail = self.null_dist.tail
if tail == "left":
acdf = np.abs(null_prob.samples)
elif tail == "right":
acdf = 1.0 - np.abs(null_prob.samples)
elif tail in ["any", "both"]:
acdf = 1.0 - np.clip(np.abs(null_prob.samples), 0, 0.5)
else:
raise RuntimeError, "Unhandled tail %s" % tail
# We need to clip to avoid non-informative inf's ;-)
# that happens due to lack of precision in mantissa
# which is 11 bits in double. We could clip values
# around 0 at as low as 1e-100 (correspond to z~=21),
# but for consistency lets clip at 1e-16 which leads
# to distinguishable value around p=1 and max z=8.2.
# Should be sufficient range of z-values ;-)
clip = 1e-16
null_t = norm.ppf(np.clip(acdf, clip, 1.0 - clip))
# assure that we deal with arrays:
null_t = np.array(null_t, ndmin=1, copy=False)
null_t[~null_right_tail] *= -1.0 # revert sign for negatives
null_t_ds = null_prob.copy(deep=False)
null_t_ds.samples = null_t
self.ca.null_t = null_t_ds # store as a Dataset
else:
# get probability of result under NULL hypothesis if available
# and don't request tail information
self.ca.null_prob = self.__null_dist.p(result)
return result
def test_swaroop_case(self, preallocate_output):
"""Test hdf5 backend to pass results on Swaroop's usecase
"""
skip_if_no_external('h5py')
from mvpa2.measures.base import Measure
class sw_measure(Measure):
def __init__(self):
Measure.__init__(self, auto_train=True)
def _call(self, dataset):
# For performance measures -- increase to 50-200
# np.sum here is just to get some meaningful value in
# them
#return np.ones(shape=(2, 2))*np.sum(dataset)
return Dataset(
np.array([{'d': np.ones(shape=(5, 5)) * np.sum(dataset)}],
dtype=object))
results = []
ds = datasets['3dsmall'].copy(deep=True)
ds.fa['voxel_indices'] = ds.fa.myspace
our_custom_prefix = tempfile.mktemp()
for backend in ['native'] + \
(externals.exists('h5py') and ['hdf5'] or []):
sl = sphere_searchlight(sw_measure(),
radius=1,
tmp_prefix=our_custom_prefix,
results_backend=backend,
preallocate_output=preallocate_output)
t0 = time.time()
results.append(np.asanyarray(sl(ds)))
# print "Done for backend %s in %d sec" % (backend, time.time() - t0)
# because of swaroop's ad-hoc (who only could recommend such
# a construct?) use case, and absent fancy working assert_objectarray_equal
# let's compare manually
#assert_objectarray_equal(*results)
if not externals.exists('h5py'):
self.assertRaises(RuntimeError,
sphere_searchlight,
sw_measure(),
results_backend='hdf5')
raise SkipTest('h5py required for test of backend="hdf5"')
assert_equal(results[0].shape, results[1].shape)
results = [r.flatten() for r in results]
for x, y in zip(*results):
assert_equal(x.keys(), y.keys())
assert_array_equal(x['d'], y['d'])
# verify that no junk is left behind
tempfiles = glob.glob(our_custom_prefix + '*')
assert_equal(len(tempfiles), 0)
def test_h5support(self):
sh = (20, 20, 20)
msk = np.zeros(sh)
for i in xrange(0, sh[0], 2):
msk[i, :, :] = 1
vg = volgeom.VolGeom(sh, np.identity(4), mask=msk)
density = 20
outer = surf.generate_sphere(density) * 10. + 5
inner = surf.generate_sphere(density) * 5. + 5
intermediate = outer * .5 + inner * .5
xyz = intermediate.vertices
radius = 50
backends = ['native', 'hdf5']
for i, backend in enumerate(backends):
if backend == 'hdf5' and not externals.exists('h5py'):
continue
sel = surf_voxel_selection.run_voxel_selection(radius, vg, inner,
outer, results_backend=backend)
if i == 0:
sel0 = sel
else:
assert_equal(sel0, sel)
def test_dist_p_value(self):
"""Basic testing of DistPValue"""
if not externals.exists('scipy'):
return
ndb = 200
ndu = 20
nperd = 2
pthr = 0.05
Nbins = 400
# Lets generate already normed data (on sphere) and add some nonbogus features
datau = (np.random.normal(size=(nperd, ndb)))
dist = np.sqrt((datau * datau).sum(axis=1))
datas = (datau.T / dist.T).T
tn = datax = datas[0, :]
dataxmax = np.max(np.abs(datax))
# now lets add true positive features
tp = [-dataxmax * 1.1] * (ndu//2) + [dataxmax * 1.1] * (ndu//2)
x = np.hstack((datax, tp))
# lets add just pure normal to it
x = np.vstack((x, np.random.normal(size=x.shape))).T
for distPValue in (DistPValue(), DistPValue(fpp=0.05)):
result = distPValue(x)
self.assertTrue((result>=0).all)
self.assertTrue((result<=1).all)
if cfg.getboolean('tests', 'labile', default='yes'):
self.assertTrue(distPValue.ca.positives_recovered[0] > 10)
self.assertTrue((np.array(distPValue.ca.positives_recovered) +
np.array(distPValue.ca.nulldist_number) == ndb + ndu).all())
self.assertEqual(distPValue.ca.positives_recovered[1], 0)
def __init__(self, normalizer_cls=None, normalizer_args=None, **kwargs):
"""
Parameters
----------
normalizer_cls : sg.Kernel.CKernelNormalizer
Class to use as a normalizer for the kernel. Will be instantiated
upon compute(). Only supported for shogun >= 0.6.5.
By default (if left None) assigns IdentityKernelNormalizer to assure no
normalization.
normalizer_args : None or list
If necessary, provide a list of arguments for the normalizer.
"""
SGKernel.__init__(self, **kwargs)
if (normalizer_cls is not None) and (versions['shogun:rev'] < 3377):
raise ValueError, \
"Normalizer specification is supported only for sg >= 0.6.5. " \
"Please upgrade shogun python modular bindings."
if normalizer_cls is None and exists('sg ge 0.6.5'):
normalizer_cls = sgk.IdentityKernelNormalizer
self._normalizer_cls = normalizer_cls
if normalizer_args is None:
normalizer_args = []
self._normalizer_args = normalizer_args
def test_preallocate_output(self, nblocks):
ds = datasets['3dsmall'].copy()[:, :25] # smaller copy
ds.fa['voxel_indices'] = ds.fa.myspace
ds.fa['feature_id'] = np.arange(ds.nfeatures)
def measure(ds):
# return more than one sample
return np.repeat(ds.fa.feature_id, 10, axis=0)
nprocs = [1, 2] if externals.exists('pprocess') else [1]
enable_ca = ['roi_sizes', 'raw_results', 'roi_feature_ids']
for nproc in nprocs:
sl = sphere_searchlight(measure,
radius=0,
center_ids=np.arange(ds.nfeatures),
nproc=nproc,
enable_ca=enable_ca,
nblocks=nblocks
)
sl_inplace = sphere_searchlight(measure,
radius=0,
preallocate_output=True,
center_ids=np.arange(ds.nfeatures),
nproc=nproc,
enable_ca=enable_ca,
nblocks=nblocks
)
out = sl(ds)
out_inplace = sl_inplace(ds)
for c in enable_ca:
assert_array_equal(sl.ca[c].value, sl_inplace.ca[c].value)
assert_array_equal(out.samples, out_inplace.samples)
assert_array_equal(out.fa.center_ids, out_inplace.fa.center_ids)
def save(dataset, destination, name=None, compression=None):
"""Save Dataset into HDF5 file
Parameters
----------
dataset : `Dataset`
destination : `h5py.highlevel.File` or str
name : str, optional
compression : None or int or {'gzip', 'szip', 'lzf'}, optional
Level of compression for gzip, or another compression strategy.
"""
if not externals.exists('h5py'):
raise RuntimeError("Missing 'h5py' package -- saving is not possible.")
import h5py
from mvpa2.base.hdf5 import obj2hdf
# look if we got an hdf file instance already
if isinstance(destination, h5py.highlevel.File):
own_file = False
hdf = destination
else:
own_file = True
hdf = h5py.File(destination, 'w')
obj2hdf(hdf, dataset, name, compression=compression)
# if we opened the file ourselves we close it now
if own_file:
hdf.close()
return
def skip_if_no_external(dep, ver_dep=None, min_version=None, max_version=None):
"""Raise SkipTest if external is missing
Parameters
----------
dep : string
Name of the external
ver_dep : string, optional
If for version checking use some different key, e.g. shogun:rev.
If not specified, `dep` will be used.
min_version : None or string or tuple
Minimal required version
max_version : None or string or tuple
Maximal required version
"""
if not externals.exists(dep):
raise SkipTest, "External %s is not present thus tests battery skipped" % dep
if ver_dep is None:
ver_dep = dep
if min_version is not None and externals.versions[ver_dep] < min_version:
raise SkipTest, "Minimal version %s of %s is required. Present version is %s" ". Test was skipped." % (
min_version,
ver_dep,
externals.versions[ver_dep],
)
if max_version is not None and externals.versions[ver_dep] > max_version:
raise SkipTest, "Maximal version %s of %s is required. Present version is %s" ". Test was skipped." % (
min_version,
ver_dep,
externals.versions[ver_dep],
)
def __init__(self, queryengine, roi_ids=None, nproc=None, **kwargs):
"""
Parameters
----------
queryengine : QueryEngine
Engine to use to discover the "neighborhood" of each feature.
See :class:`~mvpa2.misc.neighborhood.QueryEngine`.
roi_ids : None or list(int) or str
List of feature ids (not coordinates) the shall serve as ROI seeds
(e.g. sphere centers). Alternatively, this can be the name of a
feature attribute of the input dataset, whose non-zero values
determine the feature ids. By default all features will be used.
nproc : None or int
How many processes to use for computation. Requires `pprocess`
external module. If None -- all available cores will be used.
**kwargs
In addition this class supports all keyword arguments of its
base-class :class:`~mvpa2.measures.base.Measure`.
"""
Measure.__init__(self, **kwargs)
if nproc is not None and nproc > 1 and not externals.exists('pprocess'):
raise RuntimeError("The 'pprocess' module is required for "
"multiprocess searchlights. Please either "
"install python-pprocess, or reduce `nproc` "
"to 1 (got nproc=%i)" % nproc)
self._queryengine = queryengine
if roi_ids is not None and not isinstance(roi_ids, str) \
and not len(roi_ids):
raise ValueError, \
"Cannot run searchlight on an empty list of roi_ids"
self.__roi_ids = roi_ids
self.nproc = nproc
def test_product_flatten():
nsamples = 17
product_name_values = [('chan', ['C1', 'C2']),
('freq', np.arange(4, 20, 6)),
('time', np.arange(-200, 800, 200))]
shape = (nsamples,) + tuple(len(v) for _, v in product_name_values)
sample_names = ['samp%d' % i for i in xrange(nsamples)]
# generate random data in four dimensions
data = np.random.normal(size=shape)
ds = Dataset(data, sa=dict(sample_names=sample_names))
# apply flattening to ds
flattener = ProductFlattenMapper(product_name_values)
# test I/O (only if h5py is available)
if externals.exists('h5py'):
from mvpa2.base.hdf5 import h5save, h5load
import tempfile
import os
_, testfn = tempfile.mkstemp('mapper.h5py', 'test_product')
h5save(testfn, flattener)
flattener = h5load(testfn)
os.unlink(testfn)
mds = flattener(ds)
prod = lambda x:reduce(operator.mul, x)
# ensure the size is ok
assert_equal(mds.shape, (nsamples,) + (prod(shape[1:]),))
ndim = len(product_name_values)
idxs = [range(len(v)) for _, v in product_name_values]
for si in xrange(nsamples):
for fi, p in enumerate(itertools.product(*idxs)):
data_tup = (si,) + p
x = mds[si, fi]
# value should match
assert_equal(data[data_tup], x.samples[0, 0])
# indices should match as well
all_idxs = tuple(x.fa['chan_freq_time_indices'].value.ravel())
assert_equal(p, all_idxs)
# values and indices in each dimension should match
for i, (name, value) in enumerate(product_name_values):
assert_equal(x.fa[name].value, value[p[i]])
assert_equal(x.fa[name + '_indices'].value, p[i])
product_name_values += [('foo', [1, 2, 3])]
flattener = ProductFlattenMapper(product_name_values)
assert_raises(ValueError, flattener, ds)
def _level3(self, datasets):
params = self.params # for quicker access ;)
# create a mapper per dataset
mappers = [deepcopy(params.alignment) for ds in datasets]
# key different from level-2; the common space is uniform
#temp_commonspace = commonspace
# Fixing nproc=0
if params.nproc == 0:
from mvpa2.base import warning
warning("nproc of 0 doesn't make sense. Setting nproc to 1.")
params.nproc = 1
# Checking for joblib, if not, set nproc to 1
if params.nproc != 1:
from mvpa2.base import externals, warning
if not externals.exists('joblib'):
warning("Setting nproc different from 1 requires joblib package, which "
"does not seem to exist. Setting nproc to 1.")
params.nproc = 1
# start from original input datasets again
if params.nproc == 1:
residuals = []
for i, (m, ds_new) in enumerate(zip(mappers, datasets)):
if __debug__:
debug('HPAL_', "Level 3: ds #%i" % i)
m, residual = get_trained_mapper(ds_new, self.commonspace, m,
self.ca['residual_errors'].enabled)
if self.ca['residual_errors'].enabled:
residuals.append(residual)
else:
if __debug__:
debug('HPAL_', "Level 3: Using joblib with nproc = %d " % params.nproc)
verbose_level_parallel = 20 \
if (__debug__ and 'HPAL' in debug.active) else 0
from joblib import Parallel, delayed
import sys
# joblib's 'multiprocessing' backend has known issues of failure on OSX
# Tested with MacOS 10.12.13, python 2.7.13, joblib v0.10.3
if params.joblib_backend is None:
params.joblib_backend = 'threading' if sys.platform == 'darwin' \
else 'multiprocessing'
res = Parallel(
n_jobs=params.nproc, pre_dispatch=params.nproc,
backend=params.joblib_backend,
verbose=verbose_level_parallel
)(
delayed(get_trained_mapper)
(ds, self.commonspace, mapper, self.ca['residual_errors'].enabled)
for ds, mapper in zip(datasets, mappers)
)
mappers = [m for m, r in res]
if self.ca['residual_errors'].enabled:
residuals = [r for m, r in res]
if self.ca['residual_errors'].enabled:
self.ca.residual_errors = Dataset(samples=np.array(residuals)[None, :])
return mappers
def _call(self, dataset):
"""Perform the ROI search.
"""
# local binding
nproc = self.nproc
if nproc is None and externals.exists('pprocess'):
import pprocess
try:
nproc = pprocess.get_number_of_cores() or 1
except AttributeError:
warning("pprocess version %s has no API to figure out maximal "
"number of cores. Using 1"
% externals.versions['pprocess'])
nproc = 1
# train the queryengine
self._queryengine.train(dataset)
# decide whether to run on all possible center coords or just a provided
# subset
if isinstance(self.__roi_ids, str):
roi_ids = dataset.fa[self.__roi_ids].value.nonzero()[0]
elif self.__roi_ids is not None:
roi_ids = self.__roi_ids
# safeguard against stupidity
if __debug__:
if max(roi_ids) >= dataset.nfeatures:
raise IndexError, \
"Maximal center_id found is %s whenever given " \
"dataset has only %d features" \
% (max(roi_ids), dataset.nfeatures)
else:
roi_ids = np.arange(dataset.nfeatures)
# pass to subclass
results, roi_sizes = self._sl_call(dataset, roi_ids, nproc)
if not roi_sizes is None:
self.ca.roi_sizes = roi_sizes
if 'mapper' in dataset.a:
# since we know the space we can stick the original mapper into the
# results as well
if self.__roi_ids is None:
results.a['mapper'] = copy.copy(dataset.a.mapper)
else:
# there is an additional selection step that needs to be
# expressed by another mapper
mapper = copy.copy(dataset.a.mapper)
mapper.append(StaticFeatureSelection(roi_ids,
dshape=dataset.shape[1:]))
results.a['mapper'] = mapper
# charge state
self.ca.raw_results = results
# return raw results, base-class will take care of transformations
return results
def _wm_reverse(self, data):
if __debug__:
debug('MAP', "Converting signal back using DWP")
if self.__level is None:
raise NotImplementedError
else:
if not externals.exists('pywt wp reconstruct'):
raise NotImplementedError, \
"Reconstruction for a single level for versions of " \
"pywt < 0.1.7 (revision 103) is not supported"
if not externals.exists('pywt wp reconstruct fixed'):
warning("%s: Reverse mapping with this version of 'pywt' might "
"result in incorrect data in the tails of the signal. "
"Please check for an update of 'pywt', or be careful "
"when interpreting the edges of the reverse mapped "
"data." % self.__class__.__name__)
return self.__reverse_single_level(data)
def _call(self, dataset):
# This code is based on SciPy's stats.f_oneway()
# Copyright (c) Gary Strangman. All rights reserved
# License: BSD
#
# However, it got tweaked and optimized to better fit into PyMVPA.
# number of groups
targets_sa = dataset.sa[self.get_space()]
labels = targets_sa.value
ul = targets_sa.unique
na = len(ul)
bign = float(dataset.nsamples)
alldata = dataset.samples
# total squares of sums
sostot = np.sum(alldata, axis=0)
sostot *= sostot
sostot /= bign
# total sum of squares
sstot = np.sum(alldata * alldata, axis=0) - sostot
# between group sum of squares
ssbn = 0
for l in ul:
# all samples for the respective label
d = alldata[labels == l]
sos = np.sum(d, axis=0)
sos *= sos
ssbn += sos / float(len(d))
ssbn -= sostot
# within
sswn = sstot - ssbn
# degrees of freedom
dfbn = na-1
dfwn = bign - na
# mean sums of squares
msb = ssbn / float(dfbn)
msw = sswn / float(dfwn)
f = msb / msw
# assure no NaNs -- otherwise it leads instead of
# sane unittest failure (check of NaNs) to crazy
# File "mtrand.pyx", line 1661, in mtrand.shuffle
# TypeError: object of type 'numpy.int64' has no len()
# without any sane backtrace
f[np.isnan(f)] = 0
if externals.exists('scipy'):
from scipy.stats import fprob
return Dataset(f[np.newaxis], fa={'fprob': fprob(dfbn, dfwn, f)})
else:
return Dataset(f[np.newaxis])
def _acquire_externals(self, out):
# Test and list all dependencies:
sdeps = {True: [], False: [], 'Error': []}
for dep in sorted(externals._KNOWN):
try:
sdeps[externals.exists(dep, force=False)] += [dep]
except:
sdeps['Error'] += [dep]
out.write('EXTERNALS:\n')
out.write(' Present: %s\n' % ', '.join(sdeps[True]))
out.write(' Absent: %s\n' % ', '.join(sdeps[False]))
if len(sdeps['Error']):
out.write(' Errors in determining: %s\n' % ', '.join(sdeps['Error']))
SV = ('.__version__', ) # standard versioning
out.write(' Versions of critical externals:\n')
# First the ones known to externals,
# TODO: make all of them set in externals.versions
for k, v in externals.versions.iteritems():
out.write(' %-12s: %s\n' % (k, str(v)))
for e, mname, fs in (
('ctypes', None, SV),
('matplotlib', None, SV),
('lxml', None, ('.etree.__version__',)),
('nifti', None, SV),
('numpy', None, SV),
('openopt', 'openopt', SV),
('openopt', 'scikits.openopt', ('.openopt.__version__',)),
('pywt', None, SV),
#('rpy', None, ('.rpy_version',)),
('shogun', None, ('.Classifier.Version_get_version_release()',)),
):
try:
if not externals.exists(e):
continue #sver = 'not present'
else:
if mname is None:
mname = e
m = __import__(mname)
svers = [eval('m%s' % (f,)) for f in fs]
sver = ' '.join(svers)
except Exception, exc:
sver = 'failed to query due to "%s"' % str(exc)
out.write(' %-12s: %s\n' % (e, sver))
def __init__(self, space='targets', **kwargs):
ProjectionMapper.__init__(self, space=space, **kwargs)
self._scale = None
"""Estimated scale"""
if self.params.svd == 'dgesvd' and not externals.exists('liblapack.so'):
warning("Reverting choice of svd for ProcrusteanMapper to be default "
"'numpy' since liblapack.so seems not to be available for "
"'dgesvd'")
self.params.svd = 'numpy'
def __init__(self, gnb, generator, qe, errorfx=mean_mismatch_error,
indexsum=None, **kwargs):
"""Initialize a GNBSearchlight
Parameters
----------
gnb : `GNB`
`GNB` classifier as the specification of what GNB parameters
to use. Instance itself isn't used.
generator : `Generator`
Some `Generator` to prepare partitions for cross-validation.
errorfx : func, optional
Functor that computes a scalar error value from the vectors of
desired and predicted values (e.g. subclass of `ErrorFunction`).
indexsum : ('sparse', 'fancy'), optional
What use to compute sums over arbitrary columns. 'fancy'
corresponds to regular fancy indexing over columns, whenever
in 'sparse', produce of sparse matrices is used (usually
faster, so is default if `scipy` is available.
"""
# init base class first
BaseSearchlight.__init__(self, qe, **kwargs)
self._errorfx = errorfx
self._generator = generator
self._gnb = gnb
if indexsum is None:
if externals.exists('scipy'):
indexsum = 'sparse'
else:
indexsum = 'fancy'
else:
if indexsum == 'sparse' and not externals.exists('scipy'):
warning("Scipy.sparse isn't available so taking 'fancy' as "
"'indexsum' method.")
indexsum = 'fancy'
self._indexsum = indexsum
if not self.nproc in (None, 1):
raise NotImplementedError, "For now only nproc=1 (or None for " \
"autodetection) is supported by GNBSearchlight"
def __init__(self, datameasure, queryengine, add_center_fa=False,
results_backend='native',
tmp_prefix='tmpsl',
**kwargs):
"""
Parameters
----------
datameasure : callable
Any object that takes a :class:`~mvpa2.datasets.base.Dataset`
and returns some measure when called.
add_center_fa : bool or str
If True or a string, each searchlight ROI dataset will have a boolean
vector as a feature attribute that indicates the feature that is the
seed (e.g. sphere center) for the respective ROI. If True, the
attribute is named 'roi_seed', the provided string is used as the name
otherwise.
results_backend : ('native', 'hdf5'), optional
Specifies the way results are provided back from a processing block
in case of nproc > 1. 'native' is pickling/unpickling of results by
pprocess, while 'hdf5' would use h5save/h5load functionality.
'hdf5' might be more time and memory efficient in some cases.
tmp_prefix : str, optional
If specified -- serves as a prefix for temporary files storage
if results_backend == 'hdf5'. Thus can specify the directory to use
(trailing file path separator is not added automagically).
**kwargs
In addition this class supports all keyword arguments of its
base-class :class:`~mvpa2.measures.searchlight.BaseSearchlight`.
"""
BaseSearchlight.__init__(self, queryengine, **kwargs)
self.datameasure = datameasure
self.results_backend = results_backend.lower()
if self.results_backend == 'hdf5':
# Assure having hdf5
externals.exists('h5py', raise_=True)
self.tmp_prefix = tmp_prefix
if isinstance(add_center_fa, str):
self.__add_center_fa = add_center_fa
elif add_center_fa:
self.__add_center_fa = 'roi_seed'
else:
self.__add_center_fa = False
#
# Testing
#
# import the main unittest interface
from mvpa2.tests import run as test
#
# Externals-dependent tune ups
#
# PyMVPA is useless without numpy
# Also, this check enforcing population of externals.versions
# for possible later version checks, hence don't remove
externals.exists('numpy', force=True, raise_=True)
# We might need to suppress the warnings:
# If instructed -- no python or numpy warnings (like ctypes version
# for slmr), e.g. for during doctests
if cfg.getboolean('warnings', 'suppress', default=False):
import warnings
warnings.simplefilter('ignore')
# NumPy
np.seterr(**dict([(x, 'ignore') for x in np.geterr()]))
if externals.exists('scipy'):
externals._suppress_scipy_warnings()
# And check if we aren't under IPython so we could pacify completion
# a bit
Provides interface to kernels defined in shogun toolbox. Commonly
used kernels are provided with convenience classes: `LinearSGKernel`,
`RbfSGKernel`, `PolySGKernel`. If you need to use some other shogun
kernel, use `CustomSGKernel` to define one.
"""
__docformat__ = 'restructuredtext'
import numpy as np
from mvpa2.base.externals import exists, versions
from mvpa2.kernels.base import Kernel
from mvpa2.base.param import Parameter
if exists('shogun', raise_=True):
import shogun.Kernel as sgk
from shogun.Features import RealFeatures
else:
# Just to please sphinx documentation
class Bogus(object):
pass
sgk = Bogus()
sgk.LinearKernel = None
sgk.GaussianKernel = None
sgk.PolyKernel = None
if __debug__:
from mvpa2.base import debug
def from_hdf5(cls, source, name=None):
"""Load a Dataset from HDF5 file
Parameters
----------
source : string or h5py.highlevel.File
Filename or HDF5's File to load dataset from
name : string, optional
If file contains multiple entries at the 1st level, if
provided, `name` specifies the group to be loaded as the
AttrDataset.
Returns
-------
AttrDataset
Raises
------
ValueError
"""
if not externals.exists('h5py'):
raise RuntimeError(
"Missing 'h5py' package -- saving is not possible.")
import h5py
from mvpa2.base.hdf5 import hdf2obj
# look if we got an hdf file instance already
if isinstance(source, h5py.highlevel.File):
own_file = False
hdf = source
else:
own_file = True
hdf = h5py.File(source, 'r')
if not name is None:
# some HDF5 subset is requested
if not name in hdf:
raise ValueError("Cannot find '%s' group in HDF file %s. "
"File contains groups: %s"
% (name, source, hdf.keys()))
# access the group that should contain the dataset
dsgrp = hdf[name]
res = hdf2obj(dsgrp)
if not isinstance(res, AttrDataset):
# TODO: unittest before committing
raise ValueError, "%r in %s contains %s not a dataset. " \
"File contains groups: %s." \
% (name, source, type(res), hdf.keys())
else:
# just consider the whole file
res = hdf2obj(hdf)
if not isinstance(res, AttrDataset):
# TODO: unittest before committing
raise ValueError, "Failed to load a dataset from %s. " \
"Loaded %s instead." \
% (source, type(res))
if own_file:
hdf.close()
return res
import numpy as np
import os
from mvpa2.support.nibabel import afni_niml as niml
from mvpa2.support.nibabel import afni_niml_dset as niml_dset
from mvpa2.base.collections import SampleAttributesCollection, \
FeatureAttributesCollection, DatasetAttributesCollection, \
ArrayCollectable
from mvpa2.base import warning, debug, externals
from mvpa2.datasets.base import Dataset
if externals.exists('h5py'):
from mvpa2.base.hdf5 import h5save, h5load
_PYMVPA_PREFIX = 'PYMVPA'
_PYMVPA_SEP = '_'
def from_niml_dset(dset, fa_labels=[], sa_labels=[], a_labels=[]):
'''Convert a NIML dataset to a Dataset
Parameters
----------
dset: dict
Dictionary with NIML key-value pairs, such as obtained from
mvpa2.support.nibabel.afni_niml_dset.read()
fa_labels: list
# copyright and license terms.
#
### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##
"""Fixer for rdist in scipy
"""
# For scipy import
from __future__ import absolute_import
__docformat__ = 'restructuredtext'
from mvpa2.base import externals, warning, cfg
if __debug__:
from mvpa2.base import debug
if externals.exists('scipy', raise_=True):
import scipy
import scipy.stats
import scipy.stats as stats
if not externals.exists('good scipy.stats.rdist'):
if __debug__:
debug("EXT", "Fixing up scipy.stats.rdist")
# Lets fix it up, future imports of scipy.stats should carry fixed
# version, isn't python is \emph{evil} ;-)
import numpy as np
from scipy.stats.distributions import rv_continuous
from scipy import special
import scipy.integrate