def test_isfinite():
"""
Tests that pylearn2.utils.isfinite correctly
identifies `np.nan` and `np.inf` values in an array.
"""
arr = np.random.random(100)
assert isfinite(arr)
arr[0] = np.nan
assert not isfinite(arr)
arr[0] = np.inf
assert not isfinite(arr)
arr[0] = -np.inf
assert not isfinite(arr)
def set_H(self, H):
data_size, num_latent_topics = H.shape
assert data_size == self._data_size
assert num_latent_topics == self._num_latent_topics
self.H.set_value(H)
if not isfinite(self.H.get_value(borrow=True)):
raise Exception("NaN or Inf in H")
def set_W(self, W):
self._num_latent_topics, data_size = W.shape
assert data_size == self._data_size
self.output_space = VectorSpace(self._num_latent_topics)
self.W.set_value(W)
if not isfinite(self.W.get_value(borrow=True)):
raise Exception("NaN or Inf in W")
def test_mean_keep_dimensions(self):
data_set = cifar10.CIFAR10(which_set="train")
pp = RemoveMean(axis=1)
data_set.apply_preprocessor(pp, can_fit=True)
result = data_set.get_design_matrix()
assert isfinite(result)
def train_all(self, dataset):
"""
Train model
Parameters
----------
dataset: Pylearn dataset object.
"""
self._update_H()
if not isfinite(self.H.get_value(borrow=True)):
raise Exception("NaN or Inf in H")
self._update_W()
if not isfinite(self.W.get_value(borrow=True)):
raise Exception("NaN or Inf in W")
self.monitor.report_batch(self._data_size)
def entropy_binary_vector(P):
"""
.. todo::
WRITEME properly
If P[i,j] represents the probability of some binary random variable X[i,j]
being 1, then rval[i] gives the entropy of the random vector X[i,:]
"""
for Pv in get_debug_values(P):
assert Pv.min() >= 0.0
assert Pv.max() <= 1.0
oneMinusP = 1. - P
PlogP = xlogx(P)
omPlogOmP = xlogx(oneMinusP)
term1 = - T.sum(PlogP, axis=1)
assert len(term1.type.broadcastable) == 1
term2 = - T.sum(omPlogOmP, axis=1)
assert len(term2.type.broadcastable) == 1
rval = term1 + term2
debug_vals = get_debug_values(PlogP, omPlogOmP, term1, term2, rval)
for plp, olo, t1, t2, rv in debug_vals:
debug_assert(isfinite(plp))
debug_assert(isfinite(olo))
debug_assert(not contains_nan(t1))
debug_assert(not contains_nan(t2))
debug_assert(not contains_nan(rv))
return rval
def entropy_binary_vector(P):
"""
.. todo::
WRITEME properly
If P[i,j] represents the probability of some binary random variable X[i,j]
being 1, then rval[i] gives the entropy of the random vector X[i,:]
"""
for Pv in get_debug_values(P):
assert Pv.min() >= 0.0
assert Pv.max() <= 1.0
oneMinusP = 1. - P
PlogP = xlogx(P)
omPlogOmP = xlogx(oneMinusP)
term1 = -T.sum(PlogP, axis=1)
assert len(term1.type.broadcastable) == 1
term2 = -T.sum(omPlogOmP, axis=1)
assert len(term2.type.broadcastable) == 1
rval = term1 + term2
debug_vals = get_debug_values(PlogP, omPlogOmP, term1, term2, rval)
for plp, olo, t1, t2, rv in debug_vals:
debug_assert(isfinite(plp))
debug_assert(isfinite(olo))
debug_assert(not contains_nan(t1))
debug_assert(not contains_nan(t2))
debug_assert(not contains_nan(rv))
return rval
def test_zero_image(self):
"""
Test on zero-value image if cause any division by zero
"""
X = as_floatX(np.zeros((5, 32 * 32 * 3)))
axes = ['b', 0, 1, 'c']
view_converter = dense_design_matrix.DefaultViewConverter((32, 32, 3),
axes)
dataset = DenseDesignMatrix(X=X, view_converter=view_converter)
dataset.axes = axes
preprocessor = LeCunLCN(img_shape=[32, 32])
dataset.apply_preprocessor(preprocessor)
result = dataset.get_design_matrix()
assert isfinite(result)
def test_zero_image(self):
"""
Test on zero-value image if cause any division by zero
"""
X = as_floatX(np.zeros((5, 32 * 32 * 3)))
axes = ['b', 0, 1, 'c']
view_converter = dense_design_matrix.DefaultViewConverter((32, 32, 3),
axes)
dataset = DenseDesignMatrix(X=X, view_converter=view_converter)
dataset.axes = axes
preprocessor = LeCunLCN(img_shape=[32, 32])
dataset.apply_preprocessor(preprocessor)
result = dataset.get_design_matrix()
assert isfinite(result)
def test_channel(self):
"""
Test if works fine withe different number of channel as argument
"""
rng = np.random.RandomState([1, 2, 3])
X = as_floatX(rng.randn(5, 32 * 32 * 3))
axes = ['b', 0, 1, 'c']
view_converter = dense_design_matrix.DefaultViewConverter((32, 32, 3),
axes)
dataset = DenseDesignMatrix(X=X, view_converter=view_converter)
dataset.axes = axes
preprocessor = LeCunLCN(img_shape=[32, 32], channels=[1, 2])
dataset.apply_preprocessor(preprocessor)
result = dataset.get_design_matrix()
assert isfinite(result)
def test_channel(self):
"""
Test if works fine withe different number of channel as argument
"""
rng = np.random.RandomState([1, 2, 3])
X = as_floatX(rng.randn(5, 32 * 32 * 3))
axes = ['b', 0, 1, 'c']
view_converter = dense_design_matrix.DefaultViewConverter((32, 32, 3),
axes)
dataset = DenseDesignMatrix(X=X, view_converter=view_converter)
dataset.axes = axes
preprocessor = LeCunLCN(img_shape=[32, 32], channels=[1, 2])
dataset.apply_preprocessor(preprocessor)
result = dataset.get_design_matrix()
assert isfinite(result)
def test_zero_vector(self):
""" Test that passing in the zero vector does not result in
a divide by 0 """
dataset = DenseDesignMatrix(X=as_floatX(np.zeros((1, 1))))
# the settings of subtract_mean and use_norm are not relevant to
# the test
# std_bias = 0.0 is the only value for which there should be a risk
# of failure occurring
preprocessor = GlobalContrastNormalization(subtract_mean=True,
sqrt_bias=0.0,
use_std=True)
dataset.apply_preprocessor(preprocessor)
result = dataset.get_design_matrix()
assert isfinite(result)
def test_zero_vector(self):
""" Test that passing in the zero vector does not result in
a divide by 0 """
dataset = DenseDesignMatrix(X=as_floatX(np.zeros((1, 1))))
# the settings of subtract_mean and use_norm are not relevant to
# the test
# std_bias = 0.0 is the only value for which there should be a risk
# of failure occurring
preprocessor = GlobalContrastNormalization(subtract_mean=True,
sqrt_bias=0.0,
use_std=True)
dataset.apply_preprocessor(preprocessor)
result = dataset.get_design_matrix()
assert isfinite(result)
def test_rgb_yuv():
"""
Test on a random image if the per-processor loads and works without
anyerror and doesn't result in any nan or inf values
"""
rng = np.random.RandomState([1, 2, 3])
X = as_floatX(rng.randn(5, 32 * 32 * 3))
axes = ['b', 0, 1, 'c']
view_converter = dense_design_matrix.DefaultViewConverter((32, 32, 3),
axes)
dataset = DenseDesignMatrix(X=X, view_converter=view_converter)
dataset.axes = axes
preprocessor = RGB_YUV()
dataset.apply_preprocessor(preprocessor)
result = dataset.get_design_matrix()
assert isfinite(result)
def test_rgb_yuv():
"""
Test on a random image if the per-processor loads and works without
anyerror and doesn't result in any nan or inf values
"""
rng = np.random.RandomState([1, 2, 3])
X = as_floatX(rng.randn(5, 32 * 32 * 3))
axes = ['b', 0, 1, 'c']
view_converter = dense_design_matrix.DefaultViewConverter((32, 32, 3),
axes)
dataset = DenseDesignMatrix(X=X, view_converter=view_converter)
dataset.axes = axes
preprocessor = RGB_YUV()
dataset.apply_preprocessor(preprocessor)
result = dataset.get_design_matrix()
assert isfinite(result)
#variableType = "%d"
#if outputType != "int":
# variableType = "%f"
#np.savetxt(output_path, y, fmt=variableType)
#return True
# load the testing set to get the labels
nParticles = 1000
test_data, test_labels = getTestSet(nParticles, 95, 100)
#sys.argv[1]
path = os.path.join(pylearn2.__path__[0], 'myStuff', 'nano_particle_1_best.pkl' )
pred_mat = predict(path, test_data)
if not isfinite(pred_mat):
print 'Not Finite!'
#print test_data
for i in xrange(nParticles):
for j in xrange(5):
print test_labels[j,i*3], pred_mat[j,i*3]
print
from scipy.stats import pearsonr
from sklearn.metrics import r2_score
for i in xrange(nParticles):
R2 = r2_score(test_labels[:,i], pred_mat[:,i])
pearR, pvalue2 = pearsonr(test_labels[:,i], pred_mat[:,i])
print 'Particle %d:\tR^2:%.3f\tPearson R:%.3f'%(i,R2, pearR)
def train(self, dataset):
"""
Runs one epoch of SGD training on the specified dataset.
Parameters
----------
dataset : Dataset
"""
if not hasattr(self, 'sgd_update'):
raise Exception("train called without first calling setup")
# Make sure none of the parameters have bad values
for param in self.params:
value = param.get_value(borrow=True)
if not isfinite(value):
raise Exception("NaN in " + param.name)
self.first = False
rng = self.rng
if not is_stochastic(self.train_iteration_mode):
rng = None
data_specs = self.cost.get_data_specs(self.model)
# The iterator should be built from flat data specs, so it returns
# flat, non-redundent tuples of data.
mapping = DataSpecsMapping(data_specs)
space_tuple = mapping.flatten(data_specs[0], return_tuple=True)
# print 'space tuple', type(space_tuple), space_tuple
from pylearn2.space import VectorSpace
###############################################
# # # CHANGINGS TO THE ORIGINAL ALGORITHM # # #
###############################################
# we have 3 classes in dataset (active, inactive, middle), but only two softmax neurons
# therefore VectorSpace has dim = 2 and an error will be raised when trying to convert
# label to a vector of length 2. So we change the vector length for a while and convert
# things manually.
space_tuple = (space_tuple[0], VectorSpace(dim=3))
#############################
# # # END OF CHANGINGS # # #
#############################
source_tuple = mapping.flatten(data_specs[1], return_tuple=True)
if len(space_tuple) == 0:
# No data will be returned by the iterator, and it is impossible
# to know the size of the actual batch.
# It is not decided yet what the right thing to do should be.
raise NotImplementedError(
"Unable to train with SGD, because "
"the cost does not actually use data from the data set. "
"data_specs: %s" % str(data_specs))
flat_data_specs = (CompositeSpace(space_tuple), source_tuple)
iterator = dataset.iterator(mode=self.train_iteration_mode,
batch_size=self.batch_size,
data_specs=flat_data_specs,
return_tuple=True, rng=rng,
num_batches=self.batches_per_iter)
# print 'flat data specs', type(flat_data_specs), flat_data_specs
# flat data specs <type 'tuple'>
# (CompositeSpace(Conv2DSpace(shape=(18, 3492), num_channels=1, axes=('c', 0, 1, 'b'), dtype=float64),
# VectorSpace(dim=2, dtype=float64)),
# 'features', 'targets'))
on_load_batch = self.on_load_batch
for batch in iterator:
# batch is a list with two numpy arrays: [sample, label]
# self.params is a list with theano.tensor.sharedvar.TensorSharedVariables
# theano.tensor.sharedvar.TensorSharedVariable.get_value() returns numpy.array
# you can set value with theano.tensor.sharedvar.TensorSharedVariable.set_value(np.array_object)
# this being here might cause troubles as batch is a nasty thing right now
for callback in on_load_batch:
callback(*batch)
###############################################
# # # CHANGINGS TO THE ORIGINAL ALGORITHM # # #
###############################################
self.print_params("on entering iteration", t.cyan)
# GOOD ADVICE: if something is very wrong check it the following map is valid
# TODO: check this
# active 1 [[ 0. 1. 0. ]] [[ 0. 1. ]]
# nonactive 0 [[ 1. 0. 0. ]] [[ 1. 0. ]]
# middle -1 [[ 0. 0. 1. ]]
batch_1_on_load = batch[1].copy()
# if label was '0'
if (batch[1] == np.array((1, 0, 0))).all():
# print "example: nonactive"
batch = (batch[0], np.reshape(np.array((1, 0)), (1, 2)))
self.sgd_update(*batch)
# if label was '1'
elif (batch[1] == np.array((0, 1, 0))).all():
# print "example: active"
batch = (batch[0], np.reshape(np.array((0, 1)), (1, 2)))
self.sgd_update(*batch)
# else we have to deal with unlabeled example
else:
# print "example: middle"
parameters_on_load = self.get_parameters()
######################################
# # # RUNNING AS INACTIVE SAMPLE # # #
######################################
# print 'running as inactive'
# setting label as inactive
batch = (batch[0], np.reshape(np.array((1, 0)), (1, 2)))
self.print_params("on entering inactive", t.blue)
# updating the model
self.sgd_update(*batch)
self.print_params("after update inactive", t.green)
# remember changing in parameters
params_after_inactive = self.get_parameters()
diff_inactive = self.get_difference(params_after_inactive, parameters_on_load)
self.print_dict_of_params(diff_inactive, "difference")
# bring back on load parameters
self.restore_parameters(parameters_on_load)
self.print_params('after restore', t.yellow)
####################################
# # # RUNNING AS ACTIVE SAMPLE # # #
####################################
# print 'running as active'
# setting label as active
batch = (batch[0], np.reshape(np.array((0, 1)), (1, 2)))
self.print_params('on entering active', t.blue)
# updating the model
self.sgd_update(*batch)
self.print_params('after update active', t.green)
# remember changing in parameters
params_after_active = self.get_parameters()
diff_active = self.get_difference(params_after_active, parameters_on_load)
self.print_dict_of_params(diff_active, "difference")
# bring back on load parameters
self.restore_parameters(parameters_on_load)
self.print_params('after restore', t.yellow)
##############################
# # # UPDATING THE MODEL # # #
##############################
update_vector = self.calculate_update(diff_active, diff_inactive)
self.print_dict_of_params(update_vector, "update vector")
self.update_non_classification_parameters(update_vector)
# end of if
self.print_params('on leaving', t.red)
# iterator might return a smaller batch if dataset size
# isn't divisible by batch_size
# Note: if data_specs[0] is a NullSpace, there is no way to know
# how many examples would actually have been in the batch,
# since it was empty, so actual_batch_size would be reported as 0.
# OK, now lines below need batch in the previous size. So I just set the batch to what is used to be
# before my wicked transformations.
batch = (batch[0], batch_1_on_load)
self.print_self_debug()
#############################
# # # END OF CHANGINGS # # #
#############################
actual_batch_size = flat_data_specs[0].np_batch_size(batch)
self.monitor.report_batch(actual_batch_size)
for callback in self.update_callbacks:
callback(self)
# Make sure none of the parameters have bad values
for param in self.params:
value = param.get_value(borrow=True)
if not isfinite(value):
raise Exception("NaN in " + param.name)
self.second = True
def test_wiskott():
"""loads wiskott dataset"""
skip_if_no_data()
data = Wiskott()
assert isfinite(data.X)
for path in paths:
if j % 100 == 0:
print j
try:
raw_path = path
path = base + '/' + path
img = image.load(path)
#image.show(img)
if len(img.shape) == 3 and img.shape[2] == 4:
img = img[:, :, 0:3]
img = img.reshape(*([1] + list(img.shape))).astype('float32')
channels = [f(img[:, :, :, i:i + 1]) for i in xrange(img.shape[3])]
if len(channels) != 3:
assert len(channels) == 1
channels = [channels[0]] * 3
img = np.concatenate(channels, axis=3)
img = img[0, :, :, :]
assert isfinite(img)
path = outdir + '/' + raw_path
path = path[0:-3]
assert path.endswith('.')
path = path + 'npy'
np.save(path, img)
except Exception, e:
raise
print e
j += 1
def train(self, dataset):
"""
Runs one epoch of SGD training on the specified dataset.
Parameters
----------
dataset : Dataset
"""
if not hasattr(self, 'sgd_update'):
raise Exception("train called without first calling setup")
# Make sure none of the parameters have bad values
for param in self.params:
value = param.get_value(borrow=True)
if not isfinite(value):
raise Exception("NaN in " + param.name)
self.first = False
rng = self.rng
if not is_stochastic(self.train_iteration_mode):
rng = None
data_specs = self.cost.get_data_specs(self.model)
# The iterator should be built from flat data specs, so it returns
# flat, non-redundent tuples of data.
mapping = DataSpecsMapping(data_specs)
space_tuple = mapping.flatten(data_specs[0], return_tuple=True)
source_tuple = mapping.flatten(data_specs[1], return_tuple=True)
if len(space_tuple) == 0:
# No data will be returned by the iterator, and it is impossible
# to know the size of the actual batch.
# It is not decided yet what the right thing to do should be.
raise NotImplementedError("Unable to train with SGD, because "
"the cost does not actually use data from the data set. "
"data_specs: %s" % str(data_specs))
flat_data_specs = (CompositeSpace(space_tuple), source_tuple)
iterator = dataset.iterator(mode=self.train_iteration_mode,
batch_size=self.batch_size,
data_specs=flat_data_specs, return_tuple=True,
rng = rng, num_batches = self.batches_per_iter)
on_load_batch = self.on_load_batch
for batch in iterator:
for callback in on_load_batch:
callback(*batch)
self.sgd_update(*batch)
# iterator might return a smaller batch if dataset size
# isn't divisible by batch_size
# Note: if data_specs[0] is a NullSpace, there is no way to know
# how many examples would actually have been in the batch,
# since it was empty, so actual_batch_size would be reported as 0.
actual_batch_size = flat_data_specs[0].np_batch_size(batch)
self.monitor.report_batch(actual_batch_size)
for callback in self.update_callbacks:
callback(self)
# Make sure none of the parameters have bad values
for param in self.params:
value = param.get_value(borrow=True)
if not isfinite(value):
raise Exception("NaN in " + param.name)
def add_patch(self, patch, rescale=True, recenter=True, activation=None,
warn_blank_patch = True):
"""
Adds an image patch to the `PatchViewer`.
Patches are added left to right, top to bottom. If this method is
called when the `PatchViewer` is already full, it will clear the
viewer and start adding patches at the upper left again.
Parameters
----------
patch : ndarray
If this `PatchViewer` is in color (controlled by the `is_color`
parameter of the constructor) `patch` should be a 3D ndarray, with
the first axis being the rows of the image, the second axis
being the columsn of the image, and the third being RGB color
channels.
If this `PatchViewer` is grayscale, `patch` should be either a
3D ndarray with the third axis having length 1, or a 2D ndarray.
The values of the ndarray should be floating point. 0 is displayed
as gray. Negative numbers are displayed as blacker. Positive
numbers are displayed as whiter. See the `rescale` parameter for
more detail. This color convention was chosen because it is useful
for displaying weight matrices.
rescale : bool
If True, the maximum absolute value of a pixel in `patch` sets the
scale, so that abs(patch).max() is absolute white and
-abs(patch).max() is absolute black.
If False, `patch` should lie in [-1, 1].
recenter : bool
If True (default), if `patch` has smaller dimensions than were
specified to the constructor's `patch_shape` argument, we will
display the patch in the center of the area allocated to it in
the display grid.
If False, we will raise an exception if `patch` is not exactly
the specified shape.
activation : WRITEME
WRITEME
warn_blank_patch : WRITEME
WRITEME
"""
if warn_blank_patch and \
(patch.min() == patch.max()) and \
(rescale or patch.min() == 0.0):
warnings.warn("displaying totally blank patch")
if self.is_color:
assert patch.ndim == 3
if not (patch.shape[-1] == 3):
raise ValueError("Expected color image to have shape[-1]=3, "
"but shape[-1] is " + str(patch.shape[-1]))
else:
assert patch.ndim in [2, 3]
if patch.ndim == 3:
if patch.shape[-1] != 1:
raise ValueError("Expected 2D patch or 3D patch with 1 "
"channel, but got patch with shape " + \
str(patch.shape))
if recenter:
assert patch.shape[0] <= self.patch_shape[0]
if patch.shape[1] > self.patch_shape[1]:
raise ValueError("Given patch of width %d but only patches up"
" to width %d fit" \
% (patch.shape[1], self.patch_shape[1]))
rs_pad = (self.patch_shape[0] - patch.shape[0]) / 2
re_pad = self.patch_shape[0] - rs_pad - patch.shape[0]
cs_pad = (self.patch_shape[1] - patch.shape[1]) / 2
ce_pad = self.patch_shape[1] - cs_pad - patch.shape[1]
else:
if patch.shape[0:2] != self.patch_shape:
raise ValueError('Expected patch with shape %s, got %s' %
(str(self.patch_shape), str(patch.shape)))
rs_pad = 0
re_pad = 0
cs_pad = 0
ce_pad = 0
temp = patch.copy()
assert isfinite(temp)
if rescale:
scale = np.abs(temp).max()
if scale > 0:
temp /= scale
else:
if temp.min() < -1.0 or temp.max() > 1.0:
raise ValueError('When rescale is set to False, pixel values '
'must lie in [-1,1]. Got [%f, %f].'
% (temp.min(), temp.max()))
temp *= 0.5
temp += 0.5
assert temp.min() >= 0.0
assert temp.max() <= 1.0
if self.cur_pos == (0, 0):
self.clear()
rs = self.pad[0] + (self.cur_pos[0] *
(self.patch_shape[0] + self.pad[0]))
re = rs + self.patch_shape[0]
assert self.cur_pos[1] <= self.grid_shape[1]
cs = self.pad[1] + (self.cur_pos[1] *
(self.patch_shape[1] + self.pad[1]))
ce = cs + self.patch_shape[1]
assert ce <= self.image.shape[1], (ce, self.image.shape[1])
temp *= (temp > 0)
if len(temp.shape) == 2:
temp = temp[:, :, np.newaxis]
assert ce-ce_pad <= self.image.shape[1]
self.image[rs + rs_pad:re - re_pad, cs + cs_pad:ce - ce_pad, :] = temp
if activation is not None:
if (not isinstance(activation, tuple) and
not isinstance(activation, list)):
activation = (activation,)
for shell, amt in enumerate(activation):
assert 2 * shell + 2 < self.pad[0]
assert 2 * shell + 2 < self.pad[1]
if amt >= 0:
act = amt * np.asarray(self.colors[shell])
self.image[rs + rs_pad - shell - 1,
cs + cs_pad - shell - 1:
ce - ce_pad + 1 + shell,
:] = act
self.image[re - re_pad + shell,
cs + cs_pad - 1 - shell:
ce - ce_pad + 1 + shell,
:] = act
self.image[rs + rs_pad - 1 - shell:
re - re_pad + 1 + shell,
cs + cs_pad - 1 - shell,
:] = act
self.image[rs + rs_pad - shell - 1:
re - re_pad + shell + 1,
ce - ce_pad + shell,
:] = act
self.cur_pos = (self.cur_pos[0], self.cur_pos[1] + 1)
if self.cur_pos[1] == self.grid_shape[1]:
self.cur_pos = (self.cur_pos[0] + 1, 0)
if self.cur_pos[0] == self.grid_shape[0]:
self.cur_pos = (0, 0)
def __call__(self, X, termination_criterion, initial_H=None):
"""
Compute for each sample its representation.
Parameters
----------
X : Sample matrix. numpy.ndarray
termination_criterion: pylearn TerminationCriterion object
initial_H: Numpy matrix.
Returns
-------
H: H matrix with the representation.
"""
dataset_size = X.shape[0]
H = None
if initial_H is not None:
if H.shape[0] == dataset_size and H.shape[1] == self._num_latent_topics:
H = initial_H
if H is None:
if not hasattr(self, "predict_clusters"):
h = tensor.matrix(name="h")
x = tensor.matrix(name="x")
kxb = self._kernel(x, self._budget)
a = (self.W * tensor.dot(self.W, self._kernel_matrix)).sum(axis=1) \
- 2.0 * tensor.dot(kxb, self.W.T)
b = tensor.argmin(a, axis=1)
self.predict_clusters = function([x], b)
H = .2 * numpy.ones((self._data_size, self._num_latent_topics)).astype(self.W.dtype)
clusters = self.predict_clusters(X)
for i, cluster in enumerate(clusters):
H[i, cluster] += 1.0
if not hasattr(self, "predict_representation"):
h = tensor.matrix(name="h")
x = tensor.matrix(name="x")
kxb = self._kernel(x, self._budget)
kxbp = 0.5 * (numpy.abs(kxb) + kxb)
kxbn = 0.5 * (numpy.abs(kxb) - kxb)
a = tensor.dot(h, tensor.dot(self.W, self.kbn))
b = tensor.dot(kxbp + a, self.W.T)
c = tensor.dot(h, tensor.dot(self.W, self.kbp))
d = tensor.dot(kxbn + c, self.W.T)
e = h * tensor.sqrt(b / (d + self.lambda_vals))
f = tensor.maximum(e, eps)
self.predict_representation = function([x, h], f)
keep_training = True
if not isfinite(H):
raise Exception("NaN or Inf in H")
while keep_training:
H = self.predict_representation(X, H)
if not isfinite(H):
raise Exception("NaN or Inf in H")
keep_training = termination_criterion.continue_learning(self)
return H
def __init__(self, kernel, data, W,
lambda_vals=.0, H=None,
termination_criterion=None, kernel_matrix=None):
"""
Convex non-negative matrix factorization.
This model compute the CNMF factorization of a dataset.
Parameters
----------
kernel: Object that is going to compute the kernel between vectors.
The object must follow the interface in kernel_two_kay_MF.kernels.
data: Numpy matrix.
W: Numpy matrix.
lambda_vals: Regularization to avoid division by zero.
H: Numpy matrix.
termination_criterion: instance of \
pylearn2.termination_criteria.TerminationCriterion, optional
kernel_matrix: Numpy matrix. Represents dot product in the feature space of the data.
If this matrix is not provided, it is going to be computed.
"""
Model.__init__(self)
self._kernel = kernel
self._data = data
if not isfinite(self._data):
raise Exception("NaN or Inf in data")
if kernel_matrix is not None:
assert kernel_matrix.shape[0] == self._data.shape[0]
self._kernel_matrix = kernel_matrix
if not isfinite(self._kernel_matrix):
raise Exception("NaN or Inf in kernel_matrix")
else:
self._compute_kernel_matrix()
self.W = W
if not isfinite(self.W):
raise Exception("NaN or Inf in W")
assert self.W.shape[1] == self._data.shape[0]
self._data_size, self._num_features = self._data.shape
self._num_latent_topics, _ = self.W.shape
self.W = sharedX(self.W, name="W", borrow=True)
if H is not None:
if H.shape[1] != self._num_latent_topics or H.shape[0] != self._data_size:
self.H = sharedX(
numpy.random.rand(
self._data_size,
self._num_latent_topics).astype(
self.W.dtype),
name="H",
borrow=True)
self.init_H()
else:
if not isfinite(H):
raise Exception("NaN or Inf in H")
else:
self.H = sharedX(H, name="H", borrow=True)
else:
self.H = sharedX(
numpy.random.rand(self._data_size, self._num_latent_topics).astype(self.W.dtype),
name="H", borrow=True)
self.init_H()
self._params = [self.W, self.H]
self.input_space = VectorSpace(self._num_features)
self.output_space = VectorSpace(self._num_latent_topics)
self.lambda_vals = lambda_vals
self._compute_update_rules()
self._compute_helper_functions()
Monitor.get_monitor(self)
self.monitor._sanity_check()
self.termination_criterion = termination_criterion
def add_patch(self,
patch,
rescale=True,
recenter=True,
activation=None,
warn_blank_patch=True):
"""
Adds an image patch to the `PatchViewer`.
Patches are added left to right, top to bottom. If this method is
called when the `PatchViewer` is already full, it will clear the
viewer and start adding patches at the upper left again.
Parameters
----------
patch : ndarray
If this `PatchViewer` is in color (controlled by the `is_color`
parameter of the constructor) `patch` should be a 3D ndarray, with
the first axis being the rows of the image, the second axis
being the columsn of the image, and the third being RGB color
channels.
If this `PatchViewer` is grayscale, `patch` should be either a
3D ndarray with the third axis having length 1, or a 2D ndarray.
The values of the ndarray should be floating point. 0 is displayed
as gray. Negative numbers are displayed as blacker. Positive
numbers are displayed as whiter. See the `rescale` parameter for
more detail. This color convention was chosen because it is useful
for displaying weight matrices.
rescale : bool
If True, the maximum absolute value of a pixel in `patch` sets the
scale, so that abs(patch).max() is absolute white and
-abs(patch).max() is absolute black.
If False, `patch` should lie in [-1, 1].
recenter : bool
If True (default), if `patch` has smaller dimensions than were
specified to the constructor's `patch_shape` argument, we will
display the patch in the center of the area allocated to it in
the display grid.
If False, we will raise an exception if `patch` is not exactly
the specified shape.
activation : WRITEME
WRITEME
warn_blank_patch : WRITEME
WRITEME
"""
if warn_blank_patch and \
(patch.min() == patch.max()) and \
(rescale or patch.min() == 0.0):
warnings.warn("displaying totally blank patch")
if self.is_color:
assert patch.ndim == 3
if not (patch.shape[-1] == 3):
raise ValueError("Expected color image to have shape[-1]=3, "
"but shape[-1] is " + str(patch.shape[-1]))
else:
assert patch.ndim in [2, 3]
if patch.ndim == 3:
if patch.shape[-1] != 1:
raise ValueError("Expected 2D patch or 3D patch with 1 "
"channel, but got patch with shape " + \
str(patch.shape))
if recenter:
assert patch.shape[0] <= self.patch_shape[0]
if patch.shape[1] > self.patch_shape[1]:
raise ValueError("Given patch of width %d but only patches up"
" to width %d fit" \
% (patch.shape[1], self.patch_shape[1]))
rs_pad = (self.patch_shape[0] - patch.shape[0]) // 2
re_pad = self.patch_shape[0] - rs_pad - patch.shape[0]
cs_pad = (self.patch_shape[1] - patch.shape[1]) // 2
ce_pad = self.patch_shape[1] - cs_pad - patch.shape[1]
else:
if patch.shape[0:2] != self.patch_shape:
raise ValueError('Expected patch with shape %s, got %s' %
(str(self.patch_shape), str(patch.shape)))
rs_pad = 0
re_pad = 0
cs_pad = 0
ce_pad = 0
temp = patch.copy()
assert isfinite(temp)
if rescale:
scale = np.abs(temp).max()
if scale > 0:
temp /= scale
else:
if temp.min() < -1.0 or temp.max() > 1.0:
raise ValueError('When rescale is set to False, pixel values '
'must lie in [-1,1]. Got [%f, %f].' %
(temp.min(), temp.max()))
temp *= 0.5
temp += 0.5
assert temp.min() >= 0.0
assert temp.max() <= 1.0
if self.cur_pos == (0, 0):
self.clear()
rs = self.pad[0] + (self.cur_pos[0] *
(self.patch_shape[0] + self.pad[0]))
re = rs + self.patch_shape[0]
assert self.cur_pos[1] <= self.grid_shape[1]
cs = self.pad[1] + (self.cur_pos[1] *
(self.patch_shape[1] + self.pad[1]))
ce = cs + self.patch_shape[1]
assert ce <= self.image.shape[1], (ce, self.image.shape[1])
temp *= (temp > 0)
if len(temp.shape) == 2:
temp = temp[:, :, np.newaxis]
assert ce - ce_pad <= self.image.shape[1]
self.image[rs + rs_pad:re - re_pad, cs + cs_pad:ce - ce_pad, :] = temp
if activation is not None:
if (not isinstance(activation, tuple)
and not isinstance(activation, list)):
activation = (activation, )
for shell, amt in enumerate(activation):
assert 2 * shell + 2 < self.pad[0]
assert 2 * shell + 2 < self.pad[1]
if amt >= 0:
act = amt * np.asarray(self.colors[shell])
self.image[rs + rs_pad - shell - 1, cs + cs_pad - shell -
1:ce - ce_pad + 1 + shell, :] = act
self.image[re - re_pad + shell, cs + cs_pad - 1 -
shell:ce - ce_pad + 1 + shell, :] = act
self.image[rs + rs_pad - 1 - shell:re - re_pad + 1 + shell,
cs + cs_pad - 1 - shell, :] = act
self.image[rs + rs_pad - shell - 1:re - re_pad + shell + 1,
ce - ce_pad + shell, :] = act
self.cur_pos = (self.cur_pos[0], self.cur_pos[1] + 1)
if self.cur_pos[1] == self.grid_shape[1]:
self.cur_pos = (self.cur_pos[0] + 1, 0)
if self.cur_pos[0] == self.grid_shape[0]:
self.cur_pos = (0, 0)