def test_cached_kernel(self):
nchunks = 5
n = 50 * nchunks
d = Dataset(np.random.randn(n, 132))
d.sa.chunks = np.random.randint(nchunks, size=n)
# We'll compare against an Rbf just because it has a parameter to change
rk = npK.RbfKernel(sigma=1.5)
# Assure two kernels are independent for this test
ck = CachedKernel(kernel=npK.RbfKernel(sigma=1.5))
ck.compute(d) # Initial cache of all data
self.failUnless(ck._recomputed,
'CachedKernel was not initially computed')
# Try some splitting
for chunk in [d[d.sa.chunks == i] for i in range(nchunks)]:
rk.compute(chunk)
ck.compute(chunk)
self.kernel_equiv(rk, ck) #, accuracy=1e-12)
self.failIf(ck._recomputed,
"CachedKernel incorrectly recomputed it's kernel")
# Test what happens when a parameter changes
ck.params.sigma = 3.5
ck.compute(d)
self.failUnless(ck._recomputed,
"CachedKernel doesn't recompute on kernel change")
rk.params.sigma = 3.5
rk.compute(d)
self.failUnless(np.all(rk._k == ck._k),
'Cached and rbf kernels disagree after kernel change')
# Now test handling new data
d2 = Dataset(np.random.randn(32, 43))
ck.compute(d2)
self.failUnless(
ck._recomputed,
"CachedKernel did not automatically recompute new data")
ck.compute(d)
self.failUnless(ck._recomputed,
"CachedKernel did not recompute old data which had\n" +\
"previously been computed, but had the cache overriden")
def test_cached_kernel(self):
nchunks = 5
n = 50*nchunks
d = Dataset(np.random.randn(n, 132))
d.sa.chunks = np.random.randint(nchunks, size=n)
# We'll compare against an Rbf just because it has a parameter to change
rk = npK.RbfKernel(sigma=1.5)
# Assure two kernels are independent for this test
ck = CachedKernel(kernel=npK.RbfKernel(sigma=1.5))
ck.compute(d) # Initial cache of all data
self.failUnless(ck._recomputed,
'CachedKernel was not initially computed')
# Try some splitting
for chunk in [d[d.sa.chunks == i] for i in range(nchunks)]:
rk.compute(chunk)
ck.compute(chunk)
self.kernel_equiv(rk, ck) #, accuracy=1e-12)
self.failIf(ck._recomputed,
"CachedKernel incorrectly recomputed it's kernel")
# Test what happens when a parameter changes
ck.params.sigma = 3.5
ck.compute(d)
self.failUnless(ck._recomputed,
"CachedKernel doesn't recompute on kernel change")
rk.params.sigma = 3.5
rk.compute(d)
self.failUnless(np.all(rk._k == ck._k),
'Cached and rbf kernels disagree after kernel change')
# Now test handling new data
d2 = Dataset(np.random.randn(32, 43))
ck.compute(d2)
self.failUnless(ck._recomputed,
"CachedKernel did not automatically recompute new data")
ck.compute(d)
self.failUnless(ck._recomputed,
"CachedKernel did not recompute old data which had\n" +\
"previously been computed, but had the cache overriden")
def test_cached_kernel_different_datasets(self):
skip_if_no_external('shogun', ver_dep='shogun:rev', min_version=4455)
# Inspired by the problem Swaroop ran into
k = LinearSGKernel(normalizer_cls=False)
k_ = LinearSGKernel(normalizer_cls=False) # to be cached
ck = CachedKernel(k_)
clf = sgSVM(svm_impl='libsvm', kernel=k, C=-1)
clf_ = sgSVM(svm_impl='libsvm', kernel=ck, C=-1)
cvte = CrossValidatedTransferError(TransferError(clf), NFoldSplitter())
cvte_ = CrossValidatedTransferError(TransferError(clf_),
NFoldSplitter())
te = TransferError(clf)
te_ = TransferError(clf_)
for r in xrange(2):
ds1 = datasets['uni2medium']
errs1 = cvte(ds1)
ck.compute(ds1)
ok_(ck._recomputed)
errs1_ = cvte_(ds1)
ok_(~ck._recomputed)
assert_array_equal(errs1, errs1_)
ds2 = datasets['uni3small']
errs2 = cvte(ds2)
ck.compute(ds2)
ok_(ck._recomputed)
errs2_ = cvte_(ds2)
ok_(~ck._recomputed)
assert_array_equal(errs2, errs2_)
ssel = np.round(datasets['uni2large'].samples[:5, 0]).astype(int)
terr = te(datasets['uni3small_test'][ssel],
datasets['uni3small_train'][::2])
terr_ = te_(datasets['uni3small_test'][ssel],
datasets['uni3small_train'][::2])
ok_(~ck._recomputed)
ok_(terr == terr_)
def test_cached_kernel_different_datasets(self):
skip_if_no_external('shogun', ver_dep='shogun:rev', min_version=4455)
# Inspired by the problem Swaroop ran into
k = LinearSGKernel(normalizer_cls=False)
k_ = LinearSGKernel(normalizer_cls=False) # to be cached
ck = CachedKernel(k_)
clf = sgSVM(svm_impl='libsvm', kernel=k, C=-1)
clf_ = sgSVM(svm_impl='libsvm', kernel=ck, C=-1)
cvte = CrossValidation(clf, NFoldPartitioner())
cvte_ = CrossValidation(clf_, NFoldPartitioner())
postproc=BinaryFxNode(mean_mismatch_error, 'targets')
te = ProxyMeasure(clf, postproc=postproc)
te_ = ProxyMeasure(clf_, postproc=postproc)
for r in xrange(2):
ds1 = datasets['uni2medium']
errs1 = cvte(ds1)
ck.compute(ds1)
ok_(ck._recomputed)
errs1_ = cvte_(ds1)
ok_(~ck._recomputed)
assert_array_equal(errs1, errs1_)
ds2 = datasets['uni3small']
errs2 = cvte(ds2)
ck.compute(ds2)
ok_(ck._recomputed)
errs2_ = cvte_(ds2)
ok_(~ck._recomputed)
assert_array_equal(errs2, errs2_)
ssel = np.round(datasets['uni2large'].samples[:5, 0]).astype(int)
te.train(datasets['uni3small'][::2])
terr = np.asscalar(te(datasets['uni3small'][ssel]))
te_.train(datasets['uni3small'][::2])
terr_ = np.asscalar(te_(datasets['uni3small'][ssel]))
ok_(~ck._recomputed)
ok_(terr == terr_)
def test_cached_kernel_different_datasets(self):
skip_if_no_external('shogun', ver_dep='shogun:rev', min_version=4455)
# Inspired by the problem Swaroop ran into
k = LinearSGKernel(normalizer_cls=False)
k_ = LinearSGKernel(normalizer_cls=False) # to be cached
ck = CachedKernel(k_)
clf = sgSVM(svm_impl='libsvm', kernel=k, C=-1)
clf_ = sgSVM(svm_impl='libsvm', kernel=ck, C=-1)
cvte = CrossValidatedTransferError(
TransferError(clf), NFoldSplitter())
cvte_ = CrossValidatedTransferError(
TransferError(clf_), NFoldSplitter())
te = TransferError(clf)
te_ = TransferError(clf_)
for r in xrange(2):
ds1 = datasets['uni2medium']
errs1 = cvte(ds1)
ck.compute(ds1)
ok_(ck._recomputed)
errs1_ = cvte_(ds1)
ok_(~ck._recomputed)
assert_array_equal(errs1, errs1_)
ds2 = datasets['uni3small']
errs2 = cvte(ds2)
ck.compute(ds2)
ok_(ck._recomputed)
errs2_ = cvte_(ds2)
ok_(~ck._recomputed)
assert_array_equal(errs2, errs2_)
ssel = np.round(datasets['uni2large'].samples[:5, 0]).astype(int)
terr = te(datasets['uni3small_test'][ssel], datasets['uni3small_train'][::2])
terr_ = te_(datasets['uni3small_test'][ssel], datasets['uni3small_train'][::2])
ok_(~ck._recomputed)
ok_(terr == terr_)
def test_vstack_and_origids_issue(self):
# That is actually what swaroop hit
skip_if_no_external('shogun', ver_dep='shogun:rev', min_version=4455)
# Inspired by the problem Swaroop ran into
k = LinearSGKernel(normalizer_cls=False)
k_ = LinearSGKernel(normalizer_cls=False) # to be cached
ck = CachedKernel(k_)
clf = sgSVM(svm_impl='libsvm', kernel=k, C=-1)
clf_ = sgSVM(svm_impl='libsvm', kernel=ck, C=-1)
cvte = CrossValidatedTransferError(
TransferError(clf), NFoldSplitter())
cvte_ = CrossValidatedTransferError(
TransferError(clf_), NFoldSplitter())
ds = datasets['uni2large_test'].copy(deep=True)
ok_(~('orig_ids' in ds.sa)) # assure that there are None
ck.compute(ds) # so we initialize origids
ok_('origids' in ds.sa)
ds2 = ds.copy(deep=True)
ds2.samples = np.zeros(ds2.shape)
from mvpa.base.dataset import vstack
ds_vstacked = vstack((ds2, ds))
# should complaint now since there would not be unique
# samples' origids
if __debug__:
assert_raises(ValueError, ck.compute, ds_vstacked)
ds_vstacked.init_origids('samples') # reset origids
ck.compute(ds_vstacked)
errs = cvte(ds_vstacked)
errs_ = cvte_(ds_vstacked)
# Following test would have failed since origids
# were just ints, and then non-unique after vstack
assert_array_equal(errs.samples, errs_.samples)
def test_vstack_and_origids_issue(self):
# That is actually what swaroop hit
skip_if_no_external('shogun', ver_dep='shogun:rev', min_version=4455)
# Inspired by the problem Swaroop ran into
k = LinearSGKernel(normalizer_cls=False)
k_ = LinearSGKernel(normalizer_cls=False) # to be cached
ck = CachedKernel(k_)
clf = sgSVM(svm_impl='libsvm', kernel=k, C=-1)
clf_ = sgSVM(svm_impl='libsvm', kernel=ck, C=-1)
cvte = CrossValidatedTransferError(TransferError(clf), NFoldSplitter())
cvte_ = CrossValidatedTransferError(TransferError(clf_),
NFoldSplitter())
ds = datasets['uni2large_test'].copy(deep=True)
ok_(~('orig_ids' in ds.sa)) # assure that there are None
ck.compute(ds) # so we initialize origids
ok_('origids' in ds.sa)
ds2 = ds.copy(deep=True)
ds2.samples = np.zeros(ds2.shape)
from mvpa.base.dataset import vstack
ds_vstacked = vstack((ds2, ds))
# should complaint now since there would not be unique
# samples' origids
if __debug__:
assert_raises(ValueError, ck.compute, ds_vstacked)
ds_vstacked.init_origids('samples') # reset origids
ck.compute(ds_vstacked)
errs = cvte(ds_vstacked)
errs_ = cvte_(ds_vstacked)
# Following test would have failed since origids
# were just ints, and then non-unique after vstack
assert_array_equal(errs.samples, errs_.samples)