def test_factorialpartitioner_big():
# just to see that we can cope with relatively large datasets/numbers
ds = normal_feature_dataset(nlabels=6,
perlabel=66,
nfeatures=2,
nchunks=11)
# and now let's do factorial partitioner
def partition(ds_=ds, **kwargs):
partitioner = FactorialPartitioner(
partitioner=NFoldPartitioner(attr='targets'),
attr='chunks',
**kwargs)
return [p.sa.partitions for p in partitioner.generate(ds_)]
# prohibitively large
# print len(partition(ds))
t0 = time()
assert_equal(len(partition(ds, count=2, selection_strategy='first')), 2)
# Those time limits are really a stretch. on a any reasonable box not too busy
# should be done in fraction of a second, but allow to catch "naive"
# implementation
assert(time() - t0 < 3)
assert_equal(len(partition(ds, count=2, selection_strategy='random')), 2)
assert(time() - t0 < 3)
def test_slicing(self):
hs = HalfPartitioner()
spl = Splitter(attr="partitions")
splits = list(hs.generate(self.data))
for s in splits:
# partitioned dataset shared the data
assert_true(s.samples.base is self.data.samples)
splits = [list(spl.generate(p)) for p in hs.generate(self.data)]
# with numpy 1.7.0b1 "chaining" was deprecated so let's create
# check function appropriate for the given numpy version
_a = np.arange(5)
__a = _a[:4][:3]
if __a.base is _a:
# 1.7.0b1
def is_the_same_base(x, base=self.data.samples):
return x.base is base
elif __a.base.base is _a:
# prior 1.7.0b1
def is_the_same_base(x, base=self.data.samples):
return x.base.base is base
else:
raise RuntimeError("Uknown handling of .base by numpy")
for s in splits:
# we get slicing all the time
assert_true(is_the_same_base(s[0].samples))
assert_true(is_the_same_base(s[1].samples))
spl = Splitter(attr="partitions", noslicing=True)
splits = [list(spl.generate(p)) for p in hs.generate(self.data)]
for s in splits:
# we no slicing at all
assert_false(s[0].samples.base is self.data.samples)
assert_false(s[1].samples.base is self.data.samples)
nfs = NFoldPartitioner()
spl = Splitter(attr="partitions")
splits = [list(spl.generate(p)) for p in nfs.generate(self.data)]
for i, s in enumerate(splits):
# training only first and last split
if i == 0 or i == len(splits) - 1:
assert_true(is_the_same_base(s[0].samples))
else:
assert_true(s[0].samples.base is None)
# we get slicing all the time
assert_true(is_the_same_base(s[1].samples))
step_ds = Dataset(np.random.randn(20, 2), sa={"chunks": np.tile([0, 1], 10)})
oes = OddEvenPartitioner()
spl = Splitter(attr="partitions")
splits = list(oes.generate(step_ds))
for s in splits:
# partitioned dataset shared the data
assert_true(s.samples.base is step_ds.samples)
splits = [list(spl.generate(p)) for p in oes.generate(step_ds)]
assert_equal(len(splits), 2)
for s in splits:
# we get slicing all the time
assert_true(is_the_same_base(s[0].samples, step_ds.samples))
assert_true(is_the_same_base(s[1].samples, step_ds.samples))
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
fd, testfn = tempfile.mkstemp('mapper.h5py', 'test_product')
os.close(fd)
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 test_conditional_attr():
import copy
import cPickle
for node in (TestNodeOnDefault(enable_ca=['test', 'stats']),
TestNodeOffDefault(enable_ca=['test', 'stats'])):
node.ca.test = range(5)
node.ca.stats = ConfusionMatrix(labels=['one', 'two'])
node.ca.stats.add(('one', 'two', 'one', 'two'),
('one', 'two', 'two', 'one'))
node.ca.stats.compute()
dc_node = copy.deepcopy(node)
assert_equal(set(node.ca.enabled), set(dc_node.ca.enabled))
assert (node.ca['test'].enabled)
assert (node.ca['stats'].enabled)
assert_array_equal(node.ca['test'].value, dc_node.ca['test'].value)
assert_array_equal(node.ca['stats'].value.matrix,
dc_node.ca['stats'].value.matrix)
# check whether values survive pickling
pickled = cPickle.dumps(node)
up_node = cPickle.loads(pickled)
assert_array_equal(up_node.ca['test'].value, range(5))
assert_array_equal(up_node.ca['stats'].value.matrix,
node.ca['stats'].value.matrix)
def test_repeater():
reps = 4
r = Repeater(reps, space='OMG')
dsl = [ds for ds in r.generate(Dataset([0,1]))]
assert_equal(len(dsl), reps)
for i, ds in enumerate(dsl):
assert_equal(ds.a.OMG, i)
def test_repeater():
reps = 4
r = Repeater(reps, space='OMG')
dsl = [ds for ds in r.generate(Dataset([0, 1]))]
assert_equal(len(dsl), reps)
for i, ds in enumerate(dsl):
assert_equal(ds.a.OMG, i)
def test_sifter_with_balancing():
# extended previous test which was already
# "... somewhat duplicating the doctest"
ds = Dataset(samples=np.arange(12).reshape((-1, 2)),
sa={'chunks': [ 0 , 1 , 2 , 3 , 4, 5 ],
'targets': ['c', 'c', 'c', 'p', 'p', 'p']})
# Without sifter -- just to assure that we do get all of them
# i.e. 6*5*4*3/(4!) = 15
par = ChainNode([NFoldPartitioner(cvtype=4, attr='chunks')])
assert_equal(len(list(par.generate(ds))), 15)
# so we will take 4 chunks out of available 7, but would care only
# about those partitions where we have balanced number of 'c' and 'p'
# entries
assert_raises(ValueError,
lambda x: list(Sifter([('targets', dict(wrong=1))]).generate(x)),
ds)
par = ChainNode([NFoldPartitioner(cvtype=4, attr='chunks'),
Sifter([('partitions', 2),
('targets',
dict(uvalues=['c', 'p'],
balanced=True))])
])
dss = list(par.generate(ds))
# print [ x[x.sa.partitions==2].sa.targets for x in dss ]
assert_equal(len(dss), 9)
for ds_ in dss:
testing = ds[ds_.sa.partitions == 2]
assert_array_equal(np.unique(testing.sa.targets), ['c', 'p'])
# and we still have both targets present in training
training = ds[ds_.sa.partitions == 1]
assert_array_equal(np.unique(training.sa.targets), ['c', 'p'])
def test_sifter_with_balancing():
# extended previous test which was already
# "... somewhat duplicating the doctest"
ds = Dataset(samples=np.arange(12).reshape((-1, 2)),
sa={
'chunks': [0, 1, 2, 3, 4, 5],
'targets': ['c', 'c', 'c', 'p', 'p', 'p']
})
# Without sifter -- just to assure that we do get all of them
# i.e. 6*5*4*3/(4!) = 15
par = ChainNode([NFoldPartitioner(cvtype=4, attr='chunks')])
assert_equal(len(list(par.generate(ds))), 15)
# so we will take 4 chunks out of available 7, but would care only
# about those partitions where we have balanced number of 'c' and 'p'
# entries
assert_raises(
ValueError,
lambda x: list(Sifter([('targets', dict(wrong=1))]).generate(x)), ds)
par = ChainNode([
NFoldPartitioner(cvtype=4, attr='chunks'),
Sifter([('partitions', 2),
('targets', dict(uvalues=['c', 'p'], balanced=True))])
])
dss = list(par.generate(ds))
# print [ x[x.sa.partitions==2].sa.targets for x in dss ]
assert_equal(len(dss), 9)
for ds_ in dss:
testing = ds[ds_.sa.partitions == 2]
assert_array_equal(np.unique(testing.sa.targets), ['c', 'p'])
# and we still have both targets present in training
training = ds[ds_.sa.partitions == 1]
assert_array_equal(np.unique(training.sa.targets), ['c', 'p'])
def test_remove_invariant_as_a_mapper():
from mvpa2.featsel.helpers import RangeElementSelector
from mvpa2.featsel.base import StaticFeatureSelection, SensitivityBasedFeatureSelection
from mvpa2.testing.datasets import datasets
from mvpa2.datasets.miscfx import remove_invariant_features
mapper = SensitivityBasedFeatureSelection(
lambda x: np.std(x, axis=0),
RangeElementSelector(lower=0, inclusive=False),
train_analyzer=False,
auto_train=True)
ds = datasets['uni2large'].copy()
ds.a['mapper'] = StaticFeatureSelection(np.arange(ds.nfeatures))
ds.fa['index'] = np.arange(ds.nfeatures)
ds.samples[:, [1, 8]] = 10
ds_out = mapper(ds)
# Validate that we are getting the same results as remove_invariant_features
ds_rifs = remove_invariant_features(ds)
assert_array_equal(ds_out.samples, ds_rifs.samples)
assert_array_equal(ds_out.fa.index, ds_rifs.fa.index)
assert_equal(ds_out.fa.index[1], 2)
assert_equal(ds_out.fa.index[8], 10)
def assert_coordinates_almost_equal_modulo_rotation(p_xyz, q_xyz,
max_difference):
assert_equal(p_xyz.shape, q_xyz.shape)
n, three = p_xyz.shape
assert_equal(three, 3)
n_pairs_to_test = 50
get_random_int = lambda: int(random.uniform(0, n))
get_distance = lambda x, y: np.linalg.norm(x - y)
# ensure that we test for at least some distances, i.e.
# that the presence of nans everywhere would not lead to a 'skipped'
# test
did_distance_test = False
# compute some pairwise distances between nodes, and verity these
# are more or lress the same in p_xyz and q_xyz
for _ in xrange(n_pairs_to_test):
a = get_random_int()
b = get_random_int()
d_p = get_distance(p_xyz[a], p_xyz[b])
d_q = get_distance(q_xyz[a], q_xyz[b])
if not any(np.isnan([d_p, d_q])):
assert (abs(d_p - d_q) < max_difference)
did_distance_test = True
assert (did_distance_test)
def test_addaxis():
from mvpa2.mappers.shape import AddAxisMapper
ds = Dataset(np.arange(24).reshape(2, 3, 4),
sa={'testsa': np.arange(2)},
fa={'testfa': np.arange(3)})
ds0 = AddAxisMapper(pos=0)(ds)
assert_array_equal(ds0.shape, (1,) + ds.shape)
# sas have extra dimension
assert_array_equal(ds0.sa.testsa[0], ds.sa.testsa)
# fas are duplicated
assert_array_equal(ds0.fa.testfa[0], ds0.fa.testfa[1])
ds1 = AddAxisMapper(pos=1)(ds)
assert_array_equal(ds1.shape, (2, 1, 3, 4))
# same sample attribute
assert_equal(ds1.sa, ds.sa)
# fas have extra dimension
assert_array_equal(ds1.fa.testfa[0], ds.fa.testfa)
ds2 = AddAxisMapper(pos=2)(ds)
assert_array_equal(ds2.shape, (2, 3, 1, 4))
# no change to attribute collections
assert_equal(ds2.sa, ds.sa)
assert_equal(ds2.fa, ds.fa)
# append an axis
ds3 = AddAxisMapper(pos=3)(ds)
assert_array_equal(ds3.shape, ds.shape + (1,))
# reverse indexing
ds_1 = AddAxisMapper(pos=-1)(ds)
assert_array_equal(ds3.samples, ds_1.samples)
assert_equal(ds3.sa, ds_1.sa)
assert_equal(ds3.fa, ds_1.fa)
# add multiple axes
ds4 = AddAxisMapper(pos=4)(ds)
assert_array_equal(ds4.shape, ds.shape + (1, 1))
def _predict(self, ds_):
# also called for estimating training error
assert(ds_ is not ds) # we pass a shallow copy
assert(len(ds_) < len(ds))
assert_equal(len(ds_.sa['partitions'].unique), 1)
return ['c', 'd']
def test_forward_dense_array_mapper():
mask = np.ones((3, 2), dtype='bool')
map_ = mask_mapper(mask)
# test shape reports
assert_equal(map_.forward1(mask).shape, (6, ))
# test 1sample mapping
assert_array_equal(map_.forward1(np.arange(6).reshape(3, 2)),
[0, 1, 2, 3, 4, 5])
# test 4sample mapping
foursample = map_.forward(np.arange(24).reshape(4, 3, 2))
assert_array_equal(foursample,
[[0, 1, 2, 3, 4, 5], [6, 7, 8, 9, 10, 11],
[12, 13, 14, 15, 16, 17], [18, 19, 20, 21, 22, 23]])
# check incomplete masks
mask[1, 1] = 0
map_ = mask_mapper(mask)
assert_equal(map_.forward1(mask).shape, (5, ))
assert_array_equal(map_.forward1(np.arange(6).reshape(3, 2)),
[0, 1, 2, 4, 5])
# check that it doesn't accept wrong dataspace
assert_raises(ValueError, map_.forward, np.arange(4).reshape(2, 2))
# check fail if neither mask nor shape
assert_raises(ValueError, mask_mapper)
# check that a full mask is automatically created when providing shape
m = mask_mapper(shape=(2, 3, 4))
mp = m.forward1(np.arange(24).reshape(2, 3, 4))
assert_array_equal(mp, np.arange(24))
def _predict(self, ds_):
# also called for estimating training error
assert (ds_ is not ds) # we pass a shallow copy
assert (len(ds_) < len(ds))
assert_equal(len(ds_.sa['partitions'].unique), 1)
return ['c', 'd']
def test_sampleslicemapper():
# this does nothing but Dataset.__getitem__ which is tested elsewhere -- but
# at least we run it
ds = datasets['uni2small']
ssm = SampleSliceMapper(slice(3, 8, 2))
sds = ssm(ds)
assert_equal(len(sds), 3)
def test_repr():
# this time give mask only by its target length
sm = StaticFeatureSelection(slice(None), space='myspace')
# check reproduction
sm_clone = eval(repr(sm))
assert_equal(repr(sm_clone), repr(sm))
def test_corrstability_smoketest(ds):
if not 'chunks' in ds.sa:
return
if len(ds.sa['targets'].unique) > 30:
# was regression dataset
return
# very basic testing since
cs = CorrStability()
#ds = datasets['uni2small']
out = cs(ds)
assert_equal(out.shape, (ds.nfeatures,))
ok_(np.all(out >= -1.001)) # it should be a correlation after all
ok_(np.all(out <= 1.001))
# and theoretically those nonbogus features should have higher values
if 'nonbogus_targets' in ds.fa:
bogus_features = np.array([x==None for x in ds.fa.nonbogus_targets])
assert_array_less(np.mean(out[bogus_features]), np.mean(out[~bogus_features]))
# and if we move targets to alternative location
ds = ds.copy(deep=True)
ds.sa['alt'] = ds.T
ds.sa.pop('targets')
assert_raises(KeyError, cs, ds)
cs = CorrStability('alt')
out_ = cs(ds)
assert_array_equal(out, out_)
def test_corrstability_smoketest(ds):
if not 'chunks' in ds.sa:
return
if len(ds.sa['targets'].unique) > 30:
# was regression dataset
return
# very basic testing since
cs = CorrStability()
#ds = datasets['uni2small']
out = cs(ds)
assert_equal(out.shape, (ds.nfeatures, ))
ok_(np.all(out >= -1.001)) # it should be a correlation after all
ok_(np.all(out <= 1.001))
# and theoretically those nonbogus features should have higher values
if 'nonbogus_targets' in ds.fa:
bogus_features = np.array([x == None for x in ds.fa.nonbogus_targets])
assert_array_less(np.mean(out[bogus_features]),
np.mean(out[~bogus_features]))
# and if we move targets to alternative location
ds = ds.copy(deep=True)
ds.sa['alt'] = ds.T
ds.sa.pop('targets')
assert_raises(KeyError, cs, ds)
cs = CorrStability('alt')
out_ = cs(ds)
assert_array_equal(out, out_)
def test_addaxis():
from mvpa2.mappers.shape import AddAxisMapper
ds = Dataset(np.arange(24).reshape(2, 3, 4),
sa={'testsa': np.arange(2)},
fa={'testfa': np.arange(3)})
ds0 = AddAxisMapper(pos=0)(ds)
assert_array_equal(ds0.shape, (1,) + ds.shape)
# sas have extra dimension
assert_array_equal(ds0.sa.testsa[0], ds.sa.testsa)
# fas are duplicated
assert_array_equal(ds0.fa.testfa[0], ds0.fa.testfa[1])
ds1 = AddAxisMapper(pos=1)(ds)
assert_array_equal(ds1.shape, (2, 1, 3, 4))
# same sample attribute
assert_equal(ds1.sa, ds.sa)
# fas have extra dimension
assert_array_equal(ds1.fa.testfa[0], ds.fa.testfa)
ds2 = AddAxisMapper(pos=2)(ds)
assert_array_equal(ds2.shape, (2, 3, 1, 4))
# no change to attribute collections
assert_equal(ds2.sa, ds.sa)
assert_equal(ds2.fa, ds.fa)
# append an axis
ds3 = AddAxisMapper(pos=3)(ds)
assert_array_equal(ds3.shape, ds.shape + (1,))
# reverse indexing
ds_1 = AddAxisMapper(pos= -1)(ds)
assert_array_equal(ds3.samples, ds_1.samples)
assert_equal(ds3.sa, ds_1.sa)
assert_equal(ds3.fa, ds_1.fa)
# add multiple axes
ds4 = AddAxisMapper(pos=4)(ds)
assert_array_equal(ds4.shape, ds.shape + (1, 1))
def test_repr():
# this time give mask only by its target length
sm = StaticFeatureSelection(slice(None), space='myspace')
# check reproduction
sm_clone = eval(repr(sm))
assert_equal(repr(sm_clone), repr(sm))
def assert_coordinates_almost_equal_modulo_rotation(p_xyz, q_xyz,
max_difference):
assert_equal(p_xyz.shape, q_xyz.shape)
n, three = p_xyz.shape
assert_equal(three, 3)
n_pairs_to_test = 50
get_random_int = lambda: int(random.uniform(0, n))
get_distance = lambda x, y: np.linalg.norm(x - y)
# ensure that we test for at least some distances, i.e.
# that the presence of nans everywhere would not lead to a 'skipped'
# test
did_distance_test = False
# compute some pairwise distances between nodes, and verity these
# are more or lress the same in p_xyz and q_xyz
for _ in xrange(n_pairs_to_test):
a = get_random_int()
b = get_random_int()
d_p = get_distance(p_xyz[a], p_xyz[b])
d_q = get_distance(q_xyz[a], q_xyz[b])
if not any(np.isnan([d_p, d_q])):
assert (abs(d_p - d_q) < max_difference)
did_distance_test = True
assert (did_distance_test)
def test_factorialpartitioner_big():
# just to see that we can cope with relatively large datasets/numbers
ds = normal_feature_dataset(nlabels=6,
perlabel=66,
nfeatures=2,
nchunks=11)
# and now let's do factorial partitioner
def partition(ds_=ds, **kwargs):
partitioner = FactorialPartitioner(
partitioner=NFoldPartitioner(attr='targets'),
attr='chunks',
**kwargs)
return [p.sa.partitions for p in partitioner.generate(ds_)]
# prohibitively large
# print len(partition(ds))
t0 = time()
assert_equal(len(partition(ds, count=2, selection_strategy='first')), 2)
# Those time limits are really a stretch. on a any reasonable box not too busy
# should be done in fraction of a second, but allow to catch "naive"
# implementation
assert (time() - t0 < 3)
assert_equal(len(partition(ds, count=2, selection_strategy='random')), 2)
assert (time() - t0 < 3)
def test_sampleslicemapper():
# this does nothing but Dataset.__getitem__ which is tested elsewhere -- but
# at least we run it
ds = datasets['uni2small']
ssm = SampleSliceMapper(slice(3, 8, 2))
sds = ssm(ds)
assert_equal(len(sds), 3)
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 test_slicing(self):
hs = HalfPartitioner()
spl = Splitter(attr='partitions')
splits = list(hs.generate(self.data))
for s in splits:
# partitioned dataset shared the data
assert_true(s.samples.base is self.data.samples)
splits = [list(spl.generate(p)) for p in hs.generate(self.data)]
# with numpy 1.7.0b1 "chaining" was deprecated so let's create
# check function appropriate for the given numpy version
_a = np.arange(5)
__a = _a[:4][:3]
if __a.base is _a:
# 1.7.0b1
def is_the_same_base(x, base=self.data.samples):
return x.base is base
elif __a.base.base is _a:
# prior 1.7.0b1
def is_the_same_base(x, base=self.data.samples):
return x.base.base is base
else:
raise RuntimeError("Uknown handling of .base by numpy")
for s in splits:
# we get slicing all the time
assert_true(is_the_same_base(s[0].samples))
assert_true(is_the_same_base(s[1].samples))
spl = Splitter(attr='partitions', noslicing=True)
splits = [list(spl.generate(p)) for p in hs.generate(self.data)]
for s in splits:
# we no slicing at all
assert_false(s[0].samples.base is self.data.samples)
assert_false(s[1].samples.base is self.data.samples)
nfs = NFoldPartitioner()
spl = Splitter(attr='partitions')
splits = [list(spl.generate(p)) for p in nfs.generate(self.data)]
for i, s in enumerate(splits):
# training only first and last split
if i == 0 or i == len(splits) - 1:
assert_true(is_the_same_base(s[0].samples))
else:
assert_true(s[0].samples.base is None)
# we get slicing all the time
assert_true(s[1].samples.base.base is self.data.samples)
step_ds = Dataset(np.random.randn(20, 2),
sa={'chunks': np.tile([0, 1], 10)})
oes = OddEvenPartitioner()
spl = Splitter(attr='partitions')
splits = list(oes.generate(step_ds))
for s in splits:
# partitioned dataset shared the data
assert_true(s.samples.base is step_ds.samples)
splits = [list(spl.generate(p)) for p in oes.generate(step_ds)]
assert_equal(len(splits), 2)
for s in splits:
# we get slicing all the time
assert_true(s[0].samples.base.base is step_ds.samples)
assert_true(s[1].samples.base.base is step_ds.samples)
def test_strip_boundary():
ds = datasets['hollow']
ds.sa['btest'] = np.repeat([0, 1], 20)
sn = StripBoundariesSamples('btest', 1, 2)
sds = sn(ds)
assert_equal(len(sds), len(ds) - 3)
for i in [19, 20, 21]:
assert_false(i in sds.samples.sid)
def test_strip_boundary():
ds = datasets['hollow']
ds.sa['btest'] = np.repeat([0, 1], 20)
sn = StripBoundariesSamples('btest', 1, 2)
sds = sn(ds)
assert_equal(len(sds), len(ds) - 3)
for i in [19, 20, 21]:
assert_false(i in sds.samples.sid)
def test_eep_bin():
eb = EEPBin(os.path.join(pymvpa_dataroot, 'eep.bin'))
assert_equal(eb.nchannels, 32)
assert_equal(eb.nsamples, 2)
assert_equal(eb.ntimepoints, 4)
assert_true(eb.t0 - eb.dt < 0.00000001)
assert_equal(len(eb.channels), 32)
assert_equal(eb.data.shape, (2, 32, 4))
def test_eep_bin():
eb = EEPBin(os.path.join(pymvpa_dataroot, 'eep.bin'))
assert_equal(eb.nchannels, 32)
assert_equal(eb.nsamples, 2)
assert_equal(eb.ntimepoints, 4)
assert_true(eb.t0 - eb.dt < 0.00000001)
assert_equal(len(eb.channels), 32)
assert_equal(eb.data.shape, (2, 32, 4))
def test_nfold_random_counted_selection_partitioner_huge(self):
# Just test that it completes in a reasonable time and does
# not blow up as if would do if it was not limited by count
kwargs = dict(count=10)
ds = dataset_wizard(np.arange(1000).reshape((-1, 1)), targets=range(1000), chunks=range(500) * 2)
split_partitions_random = [
tuple(x.sa.partitions) for x in NFoldPartitioner(100, selection_strategy="random", **kwargs).generate(ds)
]
assert_equal(len(split_partitions_random), 10) # we get just 10
def test_searchlight_errors_per_trial():
# To make sure that searchlight can return error/accuracy per trial
from mvpa2.clfs.gnb import GNB
from mvpa2.generators.partition import OddEvenPartitioner
from mvpa2.measures.base import CrossValidation
from mvpa2.measures.searchlight import sphere_searchlight
from mvpa2.measures.gnbsearchlight import sphere_gnbsearchlight
from mvpa2.testing.datasets import datasets
from mvpa2.misc.errorfx import prediction_target_matches
dataset = datasets['3dsmall'].copy()
# randomly permute samples so we break any random correspondence
# to strengthen tests below
sample_idx = np.arange(len(dataset))
dataset = dataset[np.random.permutation(sample_idx)]
dataset.sa.targets = ['L%d' % l for l in dataset.sa.targets]
dataset.fa['voxel_indices'] = dataset.fa.myspace
sample_clf = GNB() # fast and deterministic
part = OddEvenPartitioner()
# only do partial to save time
cv = CrossValidation(sample_clf, part, errorfx=None) #prediction_target_matches)
# Just to compare error
cv_error = CrossValidation(sample_clf, part)
# Large searchlight radius so we get entire ROI, 2 centers just to make sure
# that all stacking works correctly
sl = sphere_searchlight(cv, radius=10, center_ids=[0, 1])
results = sl(dataset)
sl_gnb = sphere_gnbsearchlight(sample_clf, part, radius=10, errorfx=None,
center_ids=[0, 1])
results_gnbsl = sl_gnb(dataset)
# inspect both results
# verify that partitioning was done correctly
partitions = list(part.generate(dataset))
for res in (results, results_gnbsl):
assert('targets' in res.sa.keys()) # should carry targets
assert('cvfolds' in res.sa.keys()) # should carry cvfolds
for ipart in xrange(len(partitions)):
assert_array_equal(dataset[partitions[ipart].sa.partitions == 2].targets,
res.sa.targets[res.sa.cvfolds == ipart])
assert_datasets_equal(results, results_gnbsl)
# one "accuracy" per each trial
assert_equal(results.shape, (len(dataset), 2))
# with accuracies the same in both searchlights since the same
# features were to be selected in both cases due too large radii
errors_dataset = cv(dataset)
assert_array_equal(errors_dataset.samples[:, 0], results.samples[:, 0])
assert_array_equal(errors_dataset.samples[:, 0], results.samples[:, 1])
# and error matching (up to precision) the one if we run with default error function
assert_array_almost_equal(np.mean(results.targets[:, None] != results.samples, axis=0)[0],
np.mean(cv_error(dataset)))
def test_sphere():
# test sphere initialization
s = ne.Sphere(1)
center0 = (0, 0, 0)
center1 = (1, 1, 1)
assert_equal(len(s(center0)), 7)
target = array([array([-1, 0, 0]),
array([ 0, -1, 0]),
array([ 0, 0, -1]),
array([0, 0, 0]),
array([0, 0, 1]),
array([0, 1, 0]),
array([1, 0, 0])])
# test of internals -- no recomputation of increments should be done
prev_increments = s._increments
assert_array_equal(s(center0), target)
ok_(prev_increments is s._increments)
# query lower dimensionality
_ = s((0, 0))
ok_(not prev_increments is s._increments)
# test Sphere call
target = [array([0, 1, 1]),
array([1, 0, 1]),
array([1, 1, 0]),
array([1, 1, 1]),
array([1, 1, 2]),
array([1, 2, 1]),
array([2, 1, 1])]
res = s(center1)
assert_array_equal(array(res), target)
# They all should be tuples
ok_(np.all([isinstance(x, tuple) for x in res]))
# test for larger diameter
s = ne.Sphere(4)
assert_equal(len(s(center1)), 257)
# test extent keyword
#s = ne.Sphere(4,extent=(1,1,1))
#assert_array_equal(array(s((0,0,0))), array([[0,0,0]]))
# test Errors during initialisation and call
#assert_raises(ValueError, ne.Sphere, 2)
#assert_raises(ValueError, ne.Sphere, 1.0)
# no longer extent available
assert_raises(TypeError, ne.Sphere, 1, extent=(1))
assert_raises(TypeError, ne.Sphere, 1, extent=(1.0, 1.0, 1.0))
s = ne.Sphere(1)
#assert_raises(ValueError, s, (1))
if __debug__:
# No float coordinates allowed for now...
# XXX might like to change that ;)
#
assert_raises(ValueError, s, (1.0, 1.0, 1.0))
def test_attrpermute():
ds = give_data()
ds.sa['ids'] = range(len(ds))
pristine_data = ds.samples.copy()
permutation = AttributePermutator(['targets', 'ids'], assure=True)
pds = permutation(ds)
# should not touch the data
assert_array_equal(pristine_data, pds.samples)
# even keep the very same array
assert_true(pds.samples.base is ds.samples)
# there is no way that it can be the same attribute
assert_false(np.all(pds.sa.ids == ds.sa.ids))
# ids should reflect permutation setup
assert_array_equal(pds.sa.targets, ds.sa.targets[pds.sa.ids])
# other attribute should remain intact
assert_array_equal(pds.sa.chunks, ds.sa.chunks)
# now chunk-wise permutation
permutation = AttributePermutator('ids', limit='chunks')
pds = permutation(ds)
# first ten should remain first ten
assert_false(np.any(pds.sa.ids[:10] > 9))
# same thing, but only permute single chunk
permutation = AttributePermutator('ids', limit={'chunks': 3})
pds = permutation(ds)
# one chunk should change
assert_false(np.any(pds.sa.ids[30:40] > 39))
assert_false(np.any(pds.sa.ids[30:40] < 30))
# the rest not
assert_array_equal(pds.sa.ids[:30], range(30))
# or a list of chunks
permutation = AttributePermutator('ids', limit={'chunks': [3,4]})
pds = permutation(ds)
# two chunks should change
assert_false(np.any(pds.sa.ids[30:50] > 49))
assert_false(np.any(pds.sa.ids[30:50] < 30))
# the rest not
assert_array_equal(pds.sa.ids[:30], range(30))
# and now try generating more permutations
nruns = 2
permutation = AttributePermutator(['targets', 'ids'], assure=True, count=nruns)
pds = list(permutation.generate(ds))
assert_equal(len(pds), nruns)
for p in pds:
assert_false(np.all(p.sa.ids == ds.sa.ids))
# permute feature attrs
ds.fa['ids'] = range(ds.shape[1])
permutation = AttributePermutator('fa.ids', assure=True)
pds = permutation(ds)
assert_false(np.all(pds.fa.ids == ds.fa.ids))
def test_nfold_random_counted_selection_partitioner_huge(self):
# Just test that it completes in a reasonable time and does
# not blow up as if would do if it was not limited by count
kwargs = dict(count=10)
ds = dataset_wizard(np.arange(1000).reshape((-1, 1)),
targets=range(1000),
chunks=range(500) * 2)
split_partitions_random = [
tuple(x.sa.partitions) for x in NFoldPartitioner(
100, selection_strategy='random', **kwargs).generate(ds)
]
assert_equal(len(split_partitions_random), 10) # we get just 10
def test_read_fsl_design(self):
fname = os.path.join(pymvpa_dataroot,
'sample_design.fsf')
# use our function
design = read_fsl_design(fname)
# and just load manually to see either we match fine
set_lines = [x for x in open(fname).readlines()
if x.startswith('set ')]
assert_equal(len(set_lines), len(design))
# figure out which one is missing
"""TODO: would require the same special treatment for _files fields
def test_glmnet_r_sensitivities():
data = datasets['chirp_linear']
clf = GLMNET_R()
clf.train(data)
# now ask for the sensitivities WITHOUT having to pass the dataset
# again
sens = clf.get_sensitivity_analyzer(force_train=False)(None)
assert_equal(sens.shape, (1, data.nfeatures))
def test_glmnet_r_sensitivities():
data = datasets['chirp_linear']
clf = GLMNET_R()
clf.train(data)
# now ask for the sensitivities WITHOUT having to pass the dataset
# again
sens = clf.get_sensitivity_analyzer(force_train=False)(None)
assert_equal(sens.shape, (1, data.nfeatures))
def test_read_fsl_design(self):
fname = os.path.join(pymvpa_dataroot,
'sample_design.fsf')
# use our function
design = read_fsl_design(fname)
# and just load manually to see either we match fine
set_lines = [x for x in open(fname).readlines()
if x.startswith('set ')]
assert_equal(len(set_lines), len(design))
# figure out which one is missing
"""TODO: would require the same special treatment for _files fields
def test_glmnet_c_sensitivities():
data = normal_feature_dataset(perlabel=10, nlabels=2, nfeatures=4)
# use GLMNET on binary problem
clf = GLMNET_C()
clf.train(data)
# now ask for the sensitivities WITHOUT having to pass the dataset
# again
sens = clf.get_sensitivity_analyzer(force_train=False)(None)
#failUnless(sens.shape == (data.nfeatures,))
assert_equal(sens.shape, (len(data.UT), data.nfeatures))
def test_glmnet_c_sensitivities():
data = normal_feature_dataset(perlabel=10, nlabels=2, nfeatures=4)
# use GLMNET on binary problem
clf = GLMNET_C()
clf.train(data)
# now ask for the sensitivities WITHOUT having to pass the dataset
# again
sens = clf.get_sensitivity_analyzer(force_train=False)(None)
#failUnless(sens.shape == (data.nfeatures,))
assert_equal(sens.shape, (len(data.UT), data.nfeatures))
def test_simple_n_minus_one_cv(self):
data = get_mv_pattern(3)
data.init_origids("samples")
self.assertTrue(data.nsamples == 120)
self.assertTrue(data.nfeatures == 2)
self.assertTrue((data.sa.targets == [0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0] * 6).all())
self.assertTrue((data.sa.chunks == [k for k in range(1, 7) for i in range(20)]).all())
assert_equal(len(np.unique(data.sa.origids)), data.nsamples)
cv = CrossValidation(sample_clf_nl, NFoldPartitioner(), enable_ca=["stats", "training_stats"])
# 'samples_error'])
results = cv(data)
self.assertTrue((results.samples < 0.2).all() and (results.samples >= 0.0).all())
def test_attrmap_repr():
assert_equal(repr(AttributeMap()), "AttributeMap()")
assert_equal(repr(AttributeMap(dict(a=2, b=1))),
"AttributeMap({'a': 2, 'b': 1})")
assert_equal(repr(AttributeMap(dict(a=2, b=1), mapnumeric=True)),
"AttributeMap({'a': 2, 'b': 1}, mapnumeric=True)")
assert_equal(repr(AttributeMap(dict(a=2, b=1), mapnumeric=True, collisions_resolution='tuple')),
"AttributeMap({'a': 2, 'b': 1}, mapnumeric=True, collisions_resolution='tuple')")
def test_mean_tpr():
# Let's test now on some disbalanced sets
assert_raises(ValueError, mean_tpr, [1], [])
assert_raises(ValueError, mean_tpr, [], [1])
assert_raises(ValueError, mean_tpr, [], [])
# now interesting one where there were no target when it was in predicted
assert_raises(ValueError, mean_tpr, [1], [0])
assert_raises(ValueError, mean_tpr, [0, 1], [0, 0])
# but it should be ok to have some targets not present in prediction
assert_equal(mean_tpr([0, 0], [0, 1]), .5)
# the same regardless how many samples in 0-class, if all misclassified
# (winner by # of samples takes all)
assert_equal(mean_tpr([0, 0, 0], [0, 0, 1]), .5)
# whenever mean-accuracy would be different
assert_almost_equal(mean_match_accuracy([0, 0, 0], [0, 0, 1]), 2/3.)
def test_mean_tpr():
# Let's test now on some disbalanced sets
assert_raises(ValueError, mean_tpr, [1], [])
assert_raises(ValueError, mean_tpr, [], [1])
assert_raises(ValueError, mean_tpr, [], [])
# now interesting one where there were no target when it was in predicted
assert_raises(ValueError, mean_tpr, [1], [0])
assert_raises(ValueError, mean_tpr, [0, 1], [0, 0])
# but it should be ok to have some targets not present in prediction
assert_equal(mean_tpr([0, 0], [0, 1]), .5)
# the same regardless how many samples in 0-class, if all misclassified
# (winner by # of samples takes all)
assert_equal(mean_tpr([0, 0, 0], [0, 0, 1]), .5)
# whenever mean-accuracy would be different
assert_almost_equal(mean_match_accuracy([0, 0, 0], [0, 0, 1]), 2 / 3.)
def test_static_reverse_doesnt_work_after_feature_selection_tuneup_1():
ds_orig = datasets['uni2small'].copy() # doesn't matter which
m = StaticFeatureSelection(np.arange(4))
m.train(ds_orig)
ds = ds_orig.get_mapped(m)
ds0_rev = ds.a.mapper.reverse1(ds.samples[0]) # should work
assert_equal(ds0_rev.shape, (ds_orig.nfeatures,))
# direct feature selection
ds_ = ds[:, [0, 2]]
# should work but doesn't due to
# RuntimeError: Cannot reverse-map data since the original data shape is unknown. Either set `dshape` in the constructor, or call train().
ds0_rev_ = ds_.a.mapper.reverse1(ds_.samples[0])
#ds0_rev_ = _verified_reverse1(ds_.a.mapper, ds_.samples[0])
assert_equal(ds0_rev_.shape, (ds_orig.nfeatures,))
def test_distances():
a = np.array([3,8])
b = np.array([6,4])
# test distances or yarik recalls unit testing ;)
assert_equal(cartesian_distance(a, b), 5.0)
assert_equal(manhattan_distance(a, b), 7)
assert_equal(absmin_distance(a, b), 4)
# test that fixing typo didn't impact results
assert_equal(manhattan_distance(a, b), manhatten_distance(a, b))
def test_distances():
a = np.array([3, 8])
b = np.array([6, 4])
# test distances or yarik recalls unit testing ;)
assert_equal(cartesian_distance(a, b), 5.0)
assert_equal(manhattan_distance(a, b), 7)
assert_equal(absmin_distance(a, b), 4)
# test that fixing typo didn't impact results
assert_equal(manhattan_distance(a, b), manhatten_distance(a, b))
def test_attrmap_repr():
assert_equal(repr(AttributeMap()), "AttributeMap()")
d = dict(a=2, b=1)
assert_equal(repr(AttributeMap(d)),
"AttributeMap(%r)" % (d,))
assert_equal(repr(AttributeMap(dict(a=2, b=1), mapnumeric=True)),
"AttributeMap(%r, mapnumeric=True)" % (d,))
assert_equal(repr(AttributeMap(dict(a=2, b=1), mapnumeric=True, collisions_resolution='tuple')),
"AttributeMap(%r, mapnumeric=True, collisions_resolution='tuple')" % (d,))
def test_sifter():
# somewhat duplicating the doctest
ds = Dataset(samples=np.arange(8).reshape((4,2)),
sa={'chunks': [ 0 , 1 , 2 , 3 ],
'targets': ['c', 'c', 'p', 'p']})
par = ChainNode([NFoldPartitioner(cvtype=2, attr='chunks'),
Sifter([('partitions', 2),
('targets', ['c', 'p'])])
])
dss = list(par.generate(ds))
assert_equal(len(dss), 4)
for ds_ in dss:
testing = ds[ds_.sa.partitions == 2]
assert_array_equal(np.unique(testing.sa.targets), ['c', 'p'])
# and we still have both targets present in training
training = ds[ds_.sa.partitions == 1]
assert_array_equal(np.unique(training.sa.targets), ['c', 'p'])
def test_discarded_boundaries(self):
ds = datasets["hollow"]
# four runs
ds.sa["chunks"] = np.repeat(np.arange(4), 10)
# do odd even splitting for lots of boundaries in few splits
part = ChainNode([OddEvenPartitioner(), StripBoundariesSamples("chunks", 1, 2)])
parts = [d.samples.sid for d in part.generate(ds)]
# both dataset should have the same samples, because the boundaries are
# identical and the same sample should be stripped
assert_array_equal(parts[0], parts[1])
# we strip 3 samples per boundary
assert_equal(len(parts[0]), len(ds) - (3 * 3))
for i in [9, 10, 11, 19, 20, 21, 29, 30, 31]:
assert_false(i in parts[0])
def test_sifter():
# somewhat duplicating the doctest
ds = Dataset(samples=np.arange(8).reshape((4, 2)), sa={"chunks": [0, 1, 2, 3], "targets": ["c", "c", "p", "p"]})
for sift_targets_definition in (["c", "p"], dict(uvalues=["c", "p"])):
par = ChainNode(
[
NFoldPartitioner(cvtype=2, attr="chunks"),
Sifter([("partitions", 2), ("targets", sift_targets_definition)]),
]
)
dss = list(par.generate(ds))
assert_equal(len(dss), 4)
for ds_ in dss:
testing = ds[ds_.sa.partitions == 2]
assert_array_equal(np.unique(testing.sa.targets), ["c", "p"])
# and we still have both targets present in training
training = ds[ds_.sa.partitions == 1]
assert_array_equal(np.unique(training.sa.targets), ["c", "p"])
def test_slicing(self):
hs = HalfPartitioner()
spl = Splitter(attr='partitions')
splits = list(hs.generate(self.data))
for s in splits:
# partitioned dataset shared the data
assert_true(s.samples.base is self.data.samples)
splits = [ list(spl.generate(p)) for p in hs.generate(self.data) ]
for s in splits:
# we get slicing all the time
assert_true(s[0].samples.base.base is self.data.samples)
assert_true(s[1].samples.base.base is self.data.samples)
spl = Splitter(attr='partitions', noslicing=True)
splits = [ list(spl.generate(p)) for p in hs.generate(self.data) ]
for s in splits:
# we no slicing at all
assert_false(s[0].samples.base is self.data.samples)
assert_false(s[1].samples.base is self.data.samples)
nfs = NFoldPartitioner()
spl = Splitter(attr='partitions')
splits = [ list(spl.generate(p)) for p in nfs.generate(self.data) ]
for i, s in enumerate(splits):
# training only first and last split
if i == 0 or i == len(splits) - 1:
assert_true(s[0].samples.base.base is self.data.samples)
else:
assert_true(s[0].samples.base is None)
# we get slicing all the time
assert_true(s[1].samples.base.base is self.data.samples)
step_ds = Dataset(np.random.randn(20,2),
sa={'chunks': np.tile([0,1], 10)})
oes = OddEvenPartitioner()
spl = Splitter(attr='partitions')
splits = list(oes.generate(step_ds))
for s in splits:
# partitioned dataset shared the data
assert_true(s.samples.base is step_ds.samples)
splits = [ list(spl.generate(p)) for p in oes.generate(step_ds) ]
assert_equal(len(splits), 2)
for s in splits:
# we get slicing all the time
assert_true(s[0].samples.base.base is step_ds.samples)
assert_true(s[1].samples.base.base is step_ds.samples)
def test_discarded_boundaries(self):
ds = datasets['hollow']
# four runs
ds.sa['chunks'] = np.repeat(np.arange(4), 10)
# do odd even splitting for lots of boundaries in few splits
part = ChainNode([OddEvenPartitioner(),
StripBoundariesSamples('chunks', 1, 2)])
parts = [d.samples.sid for d in part.generate(ds)]
# both dataset should have the same samples, because the boundaries are
# identical and the same sample should be stripped
assert_array_equal(parts[0], parts[1])
# we strip 3 samples per boundary
assert_equal(len(parts[0]), len(ds) - (3 * 3))
for i in [9, 10, 11, 19, 20, 21, 29, 30, 31]:
assert_false(i in parts[0])
def test_sifter():
# somewhat duplicating the doctest
ds = Dataset(samples=np.arange(8).reshape((4,2)),
sa={'chunks': [ 0 , 1 , 2 , 3 ],
'targets': ['c', 'c', 'p', 'p']})
for sift_targets_definition in (['c', 'p'],
dict(uvalues=['c', 'p'])):
par = ChainNode([NFoldPartitioner(cvtype=2, attr='chunks'),
Sifter([('partitions', 2),
('targets', sift_targets_definition)])
])
dss = list(par.generate(ds))
assert_equal(len(dss), 4)
for ds_ in dss:
testing = ds[ds_.sa.partitions == 2]
assert_array_equal(np.unique(testing.sa.targets), ['c', 'p'])
# and we still have both targets present in training
training = ds[ds_.sa.partitions == 1]
assert_array_equal(np.unique(training.sa.targets), ['c', 'p'])
def test_mean_tpr_balanced():
# in case of the balanced sets we should expect to match mean_match_accuracy
for nclass in range(2, 4):
for nsample in range(1, 3):
target = np.repeat(np.arange(nclass), nsample)
# perfect match
assert_equal(mean_match_accuracy(target, target), 1.0)
assert_equal(mean_tpr(target, target), 1.0)
# perfect mismatch -- shift by nsample, so no target matches
estimate = np.roll(target, nsample)
assert_equal(mean_match_accuracy(target, estimate), 0)
assert_equal(mean_tpr(target, estimate), 0)
# do few permutations and see if both match
for i in range(5):
np.random.shuffle(estimate)
assert_equal(mean_tpr(target, estimate),
mean_match_accuracy(target, estimate))
assert_almost_equal(mean_tpr(target, estimate),
1 - mean_fnr(target, estimate))
def test_attrmap_repr():
assert_equal(repr(AttributeMap()), "AttributeMap()")
d = dict(a=2, b=1)
assert_equal(repr(AttributeMap(d)), "AttributeMap(%r)" % (d, ))
assert_equal(repr(AttributeMap(dict(a=2, b=1), mapnumeric=True)),
"AttributeMap(%r, mapnumeric=True)" % (d, ))
assert_equal(
repr(
AttributeMap(dict(a=2, b=1),
mapnumeric=True,
collisions_resolution='tuple')),
"AttributeMap(%r, mapnumeric=True, collisions_resolution='tuple')" %
(d, ))
def _assert_rotation_maps_vector(r, x, y):
# rotation must be 3x3 numpy array
assert_equal(r.shape, (3, 3))
assert_is_instance(r, np.ndarray)
# rotation applied to x must yield direction of y
# (modulo rounding errors)
def normed(v):
n_v = np.linalg.norm(v)
return 0 if n_v == 0 else v / n_v
rx = r.dot(x)
rx_normed = normed(rx)
y_normed = normed(y)
assert_vector_direction_almost_equal(rx_normed, y_normed)
# since it is a rotation, the result must have the same
# L2 norm as the input
assert_almost_equal(np.linalg.norm(x), np.linalg.norm(rx))
