def example2():
"""GRU"""
x = tensor.tensor3('x')
dim = 3
fork = Fork(input_dim=dim, output_dims=[dim, dim*2],name='fork',output_names=["linear","gates"], weights_init=initialization.Identity(),biases_init=Constant(0))
gru = GatedRecurrent(dim=dim, weights_init=initialization.Identity(),biases_init=Constant(0))
fork.initialize()
gru.initialize()
linear, gate_inputs = fork.apply(x)
h = gru.apply(linear, gate_inputs)
f = theano.function([x], h)
print(f(np.ones((dim, 1, dim), dtype=theano.config.floatX)))
doubler = Linear(
input_dim=dim, output_dim=dim, weights_init=initialization.Identity(2),
biases_init=initialization.Constant(0))
doubler.initialize()
lin, gate = fork.apply(doubler.apply(x))
h_doubler = gru.apply(lin,gate)
f = theano.function([x], h_doubler)
print(f(np.ones((dim, 1, dim), dtype=theano.config.floatX)))
def example2():
"""GRU"""
x = tensor.tensor3('x')
dim = 3
fork = Fork(input_dim=dim,
output_dims=[dim, dim * 2],
name='fork',
output_names=["linear", "gates"],
weights_init=initialization.Identity(),
biases_init=Constant(0))
gru = GatedRecurrent(dim=dim,
weights_init=initialization.Identity(),
biases_init=Constant(0))
fork.initialize()
gru.initialize()
linear, gate_inputs = fork.apply(x)
h = gru.apply(linear, gate_inputs)
f = theano.function([x], h)
print(f(np.ones((dim, 1, dim), dtype=theano.config.floatX)))
doubler = Linear(input_dim=dim,
output_dim=dim,
weights_init=initialization.Identity(2),
biases_init=initialization.Constant(0))
doubler.initialize()
lin, gate = fork.apply(doubler.apply(x))
h_doubler = gru.apply(lin, gate)
f = theano.function([x], h_doubler)
print(f(np.ones((dim, 1, dim), dtype=theano.config.floatX)))
def gru_layer(dim, h, n, x_mask, first, **kwargs):
fork = Fork(output_names=['linear' + str(n), 'gates' + str(n)],
name='fork' + str(n),
input_dim=dim,
output_dims=[dim, dim * 2])
gru = GatedRecurrent(dim=dim, name='gru' + str(n))
initialize([fork, gru])
linear, gates = fork.apply(h)
if first:
gruApply = gru.apply(linear, gates, mask=x_mask, **kwargs)
else:
gruApply = gru.apply(linear, gates, **kwargs)
return gruApply
def gru_layer(dim, h, n):
fork = Fork(output_names=['linear' + str(n), 'gates' + str(n)],
name='fork' + str(n), input_dim=dim, output_dims=[dim, dim * 2])
gru = GatedRecurrent(dim=dim, name='gru' + str(n))
initialize([fork, gru])
linear, gates = fork.apply(h)
return gru.apply(linear, gates)
def gru_layer(dim, h, n):
fork = Fork(output_names=['linear' + str(n), 'gates' + str(n)],
name='fork' + str(n), input_dim=dim, output_dims=[dim, dim * 2])
gru = GatedRecurrent(dim=dim, name='gru' + str(n))
initialize([fork, gru])
linear, gates = fork.apply(h)
return gru.apply(linear, gates)
def gru_layer(dim, h, n):
fork = Fork(
output_names=["linear" + str(n), "gates" + str(n)],
name="fork" + str(n),
input_dim=dim,
output_dims=[dim, dim * 2],
)
gru = GatedRecurrent(dim=dim, name="gru" + str(n))
initialize([fork, gru])
linear, gates = fork.apply(h)
return gru.apply(linear, gates)
class Encoder(Initializable):
def __init__(self,
vocab_size,
embedding_dim,
state_dim,
reverse=True,
**kwargs):
super(Encoder, self).__init__(**kwargs)
self.vocab_size = vocab_size
self.embedding_dim = embedding_dim
self.state_dim = state_dim
self.reverse = reverse
self.lookup = LookupTable(name='embeddings')
self.transition = GatedRecurrent(Tanh(), name='encoder_transition')
self.fork = Fork([
name for name in self.transition.apply.sequences if name != 'mask'
],
prototype=Linear())
self.children = [self.lookup, self.transition, self.fork]
def _push_allocation_config(self):
self.lookup.length = self.vocab_size
self.lookup.dim = self.embedding_dim
self.transition.dim = self.state_dim
self.fork.input_dim = self.embedding_dim
self.fork.output_dims = [
self.state_dim for _ in self.fork.output_names
]
@application(inputs=['source_sentence', 'source_sentence_mask'],
outputs=['representation'])
def apply(self, source_sentence, source_sentence_mask):
# Time as first dimension
source_sentence = source_sentence.dimshuffle(1, 0)
source_sentence_mask = source_sentence_mask.T
if self.reverse:
source_sentence = source_sentence[::-1]
source_sentence_mask = source_sentence_mask[::-1]
embeddings = self.lookup.apply(source_sentence)
representation = self.transition.apply(
**merge(self.fork.apply(embeddings, as_dict=True),
{'mask': source_sentence_mask}))
return representation[-1]
class InnerRecurrent(BaseRecurrent, Initializable):
def __init__(self, inner_input_dim, outer_input_dim, inner_dim, **kwargs):
self.inner_gru = GatedRecurrent(dim=inner_dim, name='inner_gru')
self.inner_input_fork = Fork(
output_names=[name for name in self.inner_gru.apply.sequences
if 'mask' not in name],
input_dim=inner_input_dim, name='inner_input_fork')
self.outer_input_fork = Fork(
output_names=[name for name in self.inner_gru.apply.sequences
if 'mask' not in name],
input_dim=outer_input_dim, name='inner_outer_fork')
super(InnerRecurrent, self).__init__(**kwargs)
self.children = [
self.inner_gru, self.inner_input_fork, self.outer_input_fork]
def _push_allocation_config(self):
self.inner_input_fork.output_dims = self.inner_gru.get_dims(
self.inner_input_fork.output_names)
self.outer_input_fork.output_dims = self.inner_gru.get_dims(
self.outer_input_fork.output_names)
@recurrent(sequences=['inner_inputs'], states=['states'],
contexts=['outer_inputs'], outputs=['states'])
def apply(self, inner_inputs, states, outer_inputs):
forked_inputs = self.inner_input_fork.apply(inner_inputs, as_dict=True)
forked_states = self.outer_input_fork.apply(outer_inputs, as_dict=True)
gru_inputs = {key: forked_inputs[key] + forked_states[key]
for key in forked_inputs.keys()}
new_states = self.inner_gru.apply(
iterate=False,
**dict_union(gru_inputs, {'states': states}))
return new_states # mean according to the time axis
def get_dim(self, name):
if name == 'states':
return self.inner_gru.get_dim(name)
else:
return AttributeError
class GatedRecurrentWithContext(Initializable):
def __init__(self, *args, **kwargs):
self.gated_recurrent = GatedRecurrent(*args, **kwargs)
self.children = [self.gated_recurrent]
@application(states=['states'],
outputs=['states'],
contexts=[
'readout_context', 'transition_context', 'update_context',
'reset_context'
])
def apply(self, transition_context, update_context, reset_context, *args,
**kwargs):
kwargs['inputs'] += transition_context
kwargs['update_inputs'] += update_context
kwargs['reset_inputs'] += reset_context
# readout_context was only added for the Readout brick, discard it
kwargs.pop('readout_context')
return self.gated_recurrent.apply(*args, **kwargs)
def get_dim(self, name):
if name in [
'readout_context', 'transition_context', 'update_context',
'reset_context'
]:
return self.dim
return self.gated_recurrent.get_dim(name)
def __getattr__(self, name):
if name == 'gated_recurrent':
raise AttributeError
return getattr(self.gated_recurrent, name)
@apply.property('sequences')
def apply_inputs(self):
sequences = ['mask', 'inputs']
if self.use_update_gate:
sequences.append('update_inputs')
if self.use_reset_gate:
sequences.append('reset_inputs')
return sequences
class Encoder(Initializable):
def __init__(self, vocab_size, embedding_dim, state_dim, reverse=True,
**kwargs):
super(Encoder, self).__init__(**kwargs)
self.vocab_size = vocab_size
self.embedding_dim = embedding_dim
self.state_dim = state_dim
self.reverse = reverse
self.lookup = LookupTable(name='embeddings')
self.transition = GatedRecurrent(Tanh(), name='encoder_transition')
self.fork = Fork([name for name in self.transition.apply.sequences
if name != 'mask'], prototype=Linear())
self.children = [self.lookup, self.transition, self.fork]
def _push_allocation_config(self):
self.lookup.length = self.vocab_size
self.lookup.dim = self.embedding_dim
self.transition.dim = self.state_dim
self.fork.input_dim = self.embedding_dim
self.fork.output_dims = [self.state_dim
for _ in self.fork.output_names]
@application(inputs=['source_sentence', 'source_sentence_mask'],
outputs=['representation'])
def apply(self, source_sentence, source_sentence_mask):
# Time as first dimension
source_sentence = source_sentence.dimshuffle(1, 0)
source_sentence_mask = source_sentence_mask.T
if self.reverse:
source_sentence = source_sentence[::-1]
source_sentence_mask = source_sentence_mask[::-1]
embeddings = self.lookup.apply(source_sentence)
representation = self.transition.apply(**merge(
self.fork.apply(embeddings, as_dict=True),
{'mask': source_sentence_mask}
))
return representation[-1]
class Encoder(Initializable):
"""Encoder of RNNsearch model."""
def __init__(self, blockid, vocab_size, embedding_dim, state_dim, **kwargs):
super(Encoder, self).__init__(**kwargs)
self.vocab_size = vocab_size
self.embedding_dim = embedding_dim
self.state_dim = state_dim
self.blockid = blockid
self.lookup = LookupTable(name='embeddings' + '_' + self.blockid)
self.gru = GatedRecurrent(activation=Tanh(), dim=state_dim, name = "GatedRNN" + self.blockid)
self.fwd_fork = Fork(
[name for name in self.gru.apply.sequences
if name != 'mask'], prototype=Linear(), name='fwd_fork' + '_' + self.blockid)
self.children = [self.lookup, self.gru, self.fwd_fork]
def _push_allocation_config(self):
self.lookup.length = self.vocab_size
self.lookup.dim = self.embedding_dim
self.fwd_fork.input_dim = self.embedding_dim
self.fwd_fork.output_dims = [self.gru.get_dim(name)
for name in self.fwd_fork.output_names]
@application(inputs=['source_sentence', 'source_sentence_mask'],
outputs=['representation'])
def apply(self, source_sentence, source_sentence_mask):
# Time as first dimension
source_sentence = source_sentence.T
source_sentence_mask = source_sentence_mask.T
embeddings = self.lookup.apply(source_sentence)
grupara = merge( self.fwd_fork.apply(embeddings, as_dict=True) , {'mask': source_sentence_mask})
representation = self.gru.apply(**grupara)
return representation
class Encoder(Initializable):
def __init__(self, vocab_size, embedding_dim, state_dim, **kwargs):
super(Encoder, self).__init__(**kwargs)
self.vocab_size = vocab_size
self.embedding_dim = embedding_dim
self.state_dim = state_dim
self.lookup = LookupTable(name='embeddings')
self.GRU = GatedRecurrent(activation=Tanh(), dim=state_dim)
self.children = [self.lookup, self.GRU]
def _push_allocation_config(self):
self.lookup.length = self.vocab_size
self.lookup.dim = self.embedding_dim
@application(inputs=['source_sentence', 'source_sentence_mask'],
outputs=['representation'])
def apply(self, source_sentence, source_sentence_mask):
source_sentence = source_sentence.T
source_sentence_mask = source_sentence_mask.T
embeddings = self.lookup.apply(source_sentence)
representation = self.GRU.apply(embeddings, embeddings)
return representation
class GatedRecurrentWithContext(Initializable):
def __init__(self, *args, **kwargs):
self.gated_recurrent = GatedRecurrent(*args, **kwargs)
self.children = [self.gated_recurrent]
@application(states=['states'], outputs=['states'],
contexts=['readout_context', 'transition_context',
'update_context', 'reset_context'])
def apply(self, transition_context, update_context, reset_context,
*args, **kwargs):
kwargs['inputs'] += transition_context
kwargs['update_inputs'] += update_context
kwargs['reset_inputs'] += reset_context
# readout_context was only added for the Readout brick, discard it
kwargs.pop('readout_context')
return self.gated_recurrent.apply(*args, **kwargs)
def get_dim(self, name):
if name in ['readout_context', 'transition_context',
'update_context', 'reset_context']:
return self.dim
return self.gated_recurrent.get_dim(name)
def __getattr__(self, name):
if name == 'gated_recurrent':
raise AttributeError
return getattr(self.gated_recurrent, name)
@apply.property('sequences')
def apply_inputs(self):
sequences = ['mask', 'inputs']
if self.use_update_gate:
sequences.append('update_inputs')
if self.use_reset_gate:
sequences.append('reset_inputs')
return sequences
iteration = 300 # number of epochs of gradient descent
print "Building Model"
# Symbolic variables
x = tensor.tensor3('x', dtype=floatX)
target = tensor.tensor3('target', dtype=floatX)
# Build the model
linear = Linear(input_dim = n_u, output_dim = n_h, name="first_layer")
rnn = GatedRecurrent(dim=n_h, activation=Tanh())
linear2 = Linear(input_dim = n_h, output_dim = n_y, name="output_layer")
sigm = Sigmoid()
x_transform = linear.apply(x)
h = rnn.apply(x_transform)
predict = sigm.apply(linear2.apply(h))
# only for generation B x h_dim
h_initial = tensor.tensor3('h_initial', dtype=floatX)
h_testing = rnn.apply(x_transform, h_initial, iterate=False)
y_hat_testing = linear2.apply(h_testing)
y_hat_testing = sigm.apply(y_hat_testing)
y_hat_testing.name = 'y_hat_testing'
# Cost function
cost = SquaredError().apply(predict,target)
# Initialization
class Parrot(Initializable, Random):
def __init__(
self,
input_dim=420, # Dimension of the text labels
output_dim=63, # Dimension of vocoder fram
rnn_h_dim=1024, # Size of rnn hidden state
readouts_dim=1024, # Size of readouts (summary of rnn)
weak_feedback=False, # Feedback to the top rnn layer
full_feedback=False, # Feedback to all rnn layers
feedback_noise_level=None, # Amount of noise in feedback
layer_norm=False, # Use simple normalization?
use_speaker=False, # Condition on the speaker id?
num_speakers=21, # How many speakers there are?
speaker_dim=128, # Size of speaker embedding
which_cost='MSE', # Train with MSE or GMM
k_gmm=20, # How many components in the GMM
sampling_bias=0, # Make samples more likely (Graves13)
epsilon=1e-5, # Numerical stabilities
num_characters=43, # how many chars in the labels
attention_type='graves', # graves or softmax
attention_size=10, # number of gaussians in the attention
attention_alignment=1., # audio steps per letter at initialization
sharpening_coeff=1.,
timing_coeff=1.,
encoder_type=None,
encoder_dim=128,
**kwargs):
super(Parrot, self).__init__(**kwargs)
self.input_dim = input_dim
self.output_dim = output_dim
self.rnn_h_dim = rnn_h_dim
self.readouts_dim = readouts_dim
self.layer_norm = layer_norm
self.which_cost = which_cost
self.use_speaker = use_speaker
self.full_feedback = full_feedback
self.feedback_noise_level = feedback_noise_level
self.epsilon = epsilon
self.num_characters = num_characters
self.attention_type = attention_type
self.attention_alignment = attention_alignment
self.attention_size = attention_size
self.sharpening_coeff = sharpening_coeff
self.timing_coeff = timing_coeff
self.encoder_type = encoder_type
self.encoder_dim = encoder_dim
self.encoded_input_dim = input_dim
if self.encoder_type == 'bidirectional':
self.encoded_input_dim = 2 * encoder_dim
if self.feedback_noise_level is not None:
self.noise_level_var = tensor.scalar('feedback_noise_level')
self.rnn1 = GatedRecurrent(dim=rnn_h_dim, name='rnn1')
self.rnn2 = GatedRecurrent(dim=rnn_h_dim, name='rnn2')
self.rnn3 = GatedRecurrent(dim=rnn_h_dim, name='rnn3')
self.h1_to_readout = Linear(input_dim=rnn_h_dim,
output_dim=readouts_dim,
name='h1_to_readout')
self.h2_to_readout = Linear(input_dim=rnn_h_dim,
output_dim=readouts_dim,
name='h2_to_readout')
self.h3_to_readout = Linear(input_dim=rnn_h_dim,
output_dim=readouts_dim,
name='h3_to_readout')
self.h1_to_h2 = Fork(output_names=['rnn2_inputs', 'rnn2_gates'],
input_dim=rnn_h_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='h1_to_h2')
self.h1_to_h3 = Fork(output_names=['rnn3_inputs', 'rnn3_gates'],
input_dim=rnn_h_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='h1_to_h3')
self.h2_to_h3 = Fork(output_names=['rnn3_inputs', 'rnn3_gates'],
input_dim=rnn_h_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='h2_to_h3')
if which_cost == 'MSE':
self.readout_to_output = Linear(input_dim=readouts_dim,
output_dim=output_dim,
name='readout_to_output')
elif which_cost == 'GMM':
self.sampling_bias = sampling_bias
self.k_gmm = k_gmm
self.readout_to_output = Fork(
output_names=['gmm_mu', 'gmm_sigma', 'gmm_coeff'],
input_dim=readouts_dim,
output_dims=[output_dim * k_gmm, output_dim * k_gmm, k_gmm],
name='readout_to_output')
self.encoder = Encoder(encoder_type,
num_characters,
input_dim,
encoder_dim,
name='encoder')
self.children = [
self.encoder, self.rnn1, self.rnn2, self.rnn3, self.h1_to_readout,
self.h2_to_readout, self.h3_to_readout, self.h1_to_h2,
self.h1_to_h3, self.h2_to_h3, self.readout_to_output
]
self.inp_to_h1 = Fork(output_names=['rnn1_inputs', 'rnn1_gates'],
input_dim=self.encoded_input_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='inp_to_h1')
self.inp_to_h2 = Fork(output_names=['rnn2_inputs', 'rnn2_gates'],
input_dim=self.encoded_input_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='inp_to_h2')
self.inp_to_h3 = Fork(output_names=['rnn3_inputs', 'rnn3_gates'],
input_dim=self.encoded_input_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='inp_to_h3')
self.children += [self.inp_to_h1, self.inp_to_h2, self.inp_to_h3]
self.h1_to_att = Fork(output_names=['alpha', 'beta', 'kappa'],
input_dim=rnn_h_dim,
output_dims=[attention_size] * 3,
name='h1_to_att')
self.att_to_readout = Linear(input_dim=self.encoded_input_dim,
output_dim=readouts_dim,
name='att_to_readout')
self.children += [self.h1_to_att, self.att_to_readout]
if use_speaker:
self.num_speakers = num_speakers
self.speaker_dim = speaker_dim
self.embed_speaker = LookupTable(num_speakers, speaker_dim)
self.speaker_to_h1 = Fork(
output_names=['rnn1_inputs', 'rnn1_gates'],
input_dim=speaker_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='speaker_to_h1')
self.speaker_to_h2 = Fork(
output_names=['rnn2_inputs', 'rnn2_gates'],
input_dim=speaker_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='speaker_to_h2')
self.speaker_to_h3 = Fork(
output_names=['rnn3_inputs', 'rnn3_gates'],
input_dim=speaker_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='speaker_to_h3')
self.speaker_to_readout = Linear(input_dim=speaker_dim,
output_dim=readouts_dim,
name='speaker_to_readout')
if which_cost == 'MSE':
self.speaker_to_output = Linear(input_dim=speaker_dim,
output_dim=output_dim,
name='speaker_to_output')
elif which_cost == 'GMM':
self.speaker_to_output = Fork(
output_names=['gmm_mu', 'gmm_sigma', 'gmm_coeff'],
input_dim=speaker_dim,
output_dims=[
output_dim * k_gmm, output_dim * k_gmm, k_gmm
],
name='speaker_to_output')
self.children += [
self.embed_speaker, self.speaker_to_h1, self.speaker_to_h2,
self.speaker_to_h3, self.speaker_to_readout,
self.speaker_to_output
]
if full_feedback:
self.out_to_h2 = Fork(output_names=['rnn2_inputs', 'rnn2_gates'],
input_dim=output_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='out_to_h2')
self.out_to_h3 = Fork(output_names=['rnn3_inputs', 'rnn3_gates'],
input_dim=output_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='out_to_h3')
self.children += [self.out_to_h2, self.out_to_h3]
weak_feedback = True
self.weak_feedback = weak_feedback
if weak_feedback:
self.out_to_h1 = Fork(output_names=['rnn1_inputs', 'rnn1_gates'],
input_dim=output_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='out_to_h1')
self.children += [self.out_to_h1]
def _allocate(self):
self.initial_w = shared_floatx_zeros((self.encoded_input_dim, ),
name="initial_w")
add_role(self.initial_w, INITIAL_STATE)
def symbolic_input_variables(self):
features = tensor.tensor3('features')
features_mask = tensor.matrix('features_mask')
labels = tensor.imatrix('labels')
labels_mask = tensor.matrix('labels_mask')
start_flag = tensor.scalar('start_flag')
if self.use_speaker:
speaker = tensor.imatrix('speaker_index')
else:
speaker = None
return features, features_mask, labels, labels_mask, \
speaker, start_flag
def initial_states(self, batch_size):
initial_h1 = self.rnn1.initial_states(batch_size)
initial_h2 = self.rnn2.initial_states(batch_size)
initial_h3 = self.rnn3.initial_states(batch_size)
last_h1 = shared_floatx_zeros((batch_size, self.rnn_h_dim))
last_h2 = shared_floatx_zeros((batch_size, self.rnn_h_dim))
last_h3 = shared_floatx_zeros((batch_size, self.rnn_h_dim))
# Defining for all
initial_k = tensor.zeros((batch_size, self.attention_size),
dtype=floatX)
last_k = shared_floatx_zeros((batch_size, self.attention_size))
# Trainable initial state for w. Why not for k?
initial_w = tensor.repeat(self.initial_w[None, :], batch_size, 0)
last_w = shared_floatx_zeros((batch_size, self.encoded_input_dim))
return initial_h1, last_h1, initial_h2, last_h2, initial_h3, last_h3, \
initial_w, last_w, initial_k, last_k
@application
def compute_cost(self, features, features_mask, labels, labels_mask,
speaker, start_flag, batch_size):
if speaker is None:
assert not self.use_speaker
target_features = features[1:]
mask = features_mask[1:]
cell_shape = (mask.shape[0], batch_size, self.rnn_h_dim)
gat_shape = (mask.shape[0], batch_size, 2 * self.rnn_h_dim)
cell_h1 = tensor.zeros(cell_shape, dtype=floatX)
cell_h2 = tensor.zeros(cell_shape, dtype=floatX)
cell_h3 = tensor.zeros(cell_shape, dtype=floatX)
gat_h1 = tensor.zeros(gat_shape, dtype=floatX)
gat_h2 = tensor.zeros(gat_shape, dtype=floatX)
gat_h3 = tensor.zeros(gat_shape, dtype=floatX)
if self.weak_feedback:
input_features = features[:-1]
if self.feedback_noise_level:
noise = self.theano_rng.normal(size=input_features.shape,
avg=0.,
std=1.)
input_features += self.noise_level_var * noise
out_cell_h1, out_gat_h1 = self.out_to_h1.apply(input_features)
to_normalize = [out_cell_h1, out_gat_h1]
out_cell_h1, out_gat_h1 = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
cell_h1 += out_cell_h1
gat_h1 += out_gat_h1
if self.full_feedback:
assert self.weak_feedback
out_cell_h2, out_gat_h2 = self.out_to_h2.apply(input_features)
out_cell_h3, out_gat_h3 = self.out_to_h3.apply(input_features)
to_normalize = [out_cell_h2, out_gat_h2, out_cell_h3, out_gat_h3]
out_cell_h2, out_gat_h2, out_cell_h3, out_gat_h3 = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
cell_h2 += out_cell_h2
gat_h2 += out_gat_h2
cell_h3 += out_cell_h3
gat_h3 += out_gat_h3
if self.use_speaker:
speaker = speaker[:, 0]
emb_speaker = self.embed_speaker.apply(speaker)
emb_speaker = tensor.shape_padleft(emb_speaker)
spk_cell_h1, spk_gat_h1 = self.speaker_to_h1.apply(emb_speaker)
spk_cell_h2, spk_gat_h2 = self.speaker_to_h2.apply(emb_speaker)
spk_cell_h3, spk_gat_h3 = self.speaker_to_h3.apply(emb_speaker)
to_normalize = [
spk_cell_h1, spk_gat_h1, spk_cell_h2, spk_gat_h2, spk_cell_h3,
spk_gat_h3
]
spk_cell_h1, spk_gat_h1, spk_cell_h2, spk_gat_h2, \
spk_cell_h3, spk_gat_h3, = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
cell_h1 = spk_cell_h1 + cell_h1
cell_h2 = spk_cell_h2 + cell_h2
cell_h3 = spk_cell_h3 + cell_h3
gat_h1 = spk_gat_h1 + gat_h1
gat_h2 = spk_gat_h2 + gat_h2
gat_h3 = spk_gat_h3 + gat_h3
initial_h1, last_h1, initial_h2, last_h2, initial_h3, last_h3, \
initial_w, last_w, initial_k, last_k = \
self.initial_states(batch_size)
# If it's a new example, use initial states.
input_h1 = tensor.switch(start_flag, initial_h1, last_h1)
input_h2 = tensor.switch(start_flag, initial_h2, last_h2)
input_h3 = tensor.switch(start_flag, initial_h3, last_h3)
input_w = tensor.switch(start_flag, initial_w, last_w)
input_k = tensor.switch(start_flag, initial_k, last_k)
context_oh = self.encoder.apply(labels) * \
tensor.shape_padright(labels_mask)
u = tensor.shape_padleft(tensor.arange(labels.shape[1], dtype=floatX),
2)
def step(inp_h1_t, gat_h1_t, inp_h2_t, gat_h2_t, inp_h3_t, gat_h3_t,
h1_tm1, h2_tm1, h3_tm1, k_tm1, w_tm1, context_oh):
attinp_h1, attgat_h1 = self.inp_to_h1.apply(w_tm1)
inp_h1_t += attinp_h1
gat_h1_t += attgat_h1
h1_t = self.rnn1.apply(inp_h1_t, gat_h1_t, h1_tm1, iterate=False)
a_t, b_t, k_t = self.h1_to_att.apply(h1_t)
if self.attention_type == "softmax":
a_t = tensor.nnet.softmax(a_t) + self.epsilon
else:
a_t = tensor.exp(a_t) + self.epsilon
b_t = tensor.exp(b_t) + self.epsilon
k_t = k_tm1 + self.attention_alignment * tensor.exp(k_t)
a_t_ = a_t
a_t = tensor.shape_padright(a_t)
b_t = tensor.shape_padright(b_t)
k_t_ = tensor.shape_padright(k_t)
# batch size X att size X len context
if self.attention_type == "softmax":
# numpy.sqrt(1/(2*numpy.pi)) is the weird number
phi_t = 0.3989422917366028 * tensor.sum(
a_t * tensor.sqrt(b_t) * tensor.exp(-0.5 * b_t *
(k_t_ - u)**2),
axis=1)
else:
phi_t = tensor.sum(a_t * tensor.exp(-b_t * (k_t_ - u)**2),
axis=1)
# batch size X len context X num letters
w_t = (tensor.shape_padright(phi_t) * context_oh).sum(axis=1)
attinp_h2, attgat_h2 = self.inp_to_h2.apply(w_t)
attinp_h3, attgat_h3 = self.inp_to_h3.apply(w_t)
inp_h2_t += attinp_h2
gat_h2_t += attgat_h2
inp_h3_t += attinp_h3
gat_h3_t += attgat_h3
h1inp_h2, h1gat_h2 = self.h1_to_h2.apply(h1_t)
h1inp_h3, h1gat_h3 = self.h1_to_h3.apply(h1_t)
to_normalize = [h1inp_h2, h1gat_h2, h1inp_h3, h1gat_h3]
h1inp_h2, h1gat_h2, h1inp_h3, h1gat_h3 = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
h2_t = self.rnn2.apply(inp_h2_t + h1inp_h2,
gat_h2_t + h1gat_h2,
h2_tm1,
iterate=False)
h2inp_h3, h2gat_h3 = self.h2_to_h3.apply(h2_t)
to_normalize = [h2inp_h3, h2gat_h3]
h2inp_h3, h2gat_h3 = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
h3_t = self.rnn3.apply(inp_h3_t + h1inp_h3 + h2inp_h3,
gat_h3_t + h1gat_h3 + h2gat_h3,
h3_tm1,
iterate=False)
return h1_t, h2_t, h3_t, k_t, w_t, phi_t, a_t_
(h1, h2, h3, k, w, phi, pi_att), scan_updates = theano.scan(
fn=step,
sequences=[cell_h1, gat_h1, cell_h2, gat_h2, cell_h3, gat_h3],
non_sequences=[context_oh],
outputs_info=[
input_h1, input_h2, input_h3, input_k, input_w, None, None
])
h1_out = self.h1_to_readout.apply(h1)
h2_out = self.h2_to_readout.apply(h2)
h3_out = self.h3_to_readout.apply(h3)
to_normalize = [h1_out, h2_out, h3_out]
h1_out, h2_out, h3_out = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
readouts = h1_out + h2_out + h3_out
if self.use_speaker:
readouts += self.speaker_to_readout.apply(emb_speaker)
readouts += self.att_to_readout.apply(w)
predicted = self.readout_to_output.apply(readouts)
if self.which_cost == 'MSE':
if self.use_speaker:
predicted += self.speaker_to_output.apply(emb_speaker)
cost = tensor.sum((predicted - target_features)**2, axis=-1)
next_x = predicted
# Dummy value for coeff
coeff = predicted
elif self.which_cost == 'GMM':
mu, sigma, coeff = predicted
if self.use_speaker:
spk_to_out = self.speaker_to_output.apply(emb_speaker)
mu += spk_to_out[0]
sigma += spk_to_out[1]
coeff += spk_to_out[2]
# When training there should not be sampling_bias
sigma = tensor.exp(sigma) + self.epsilon
coeff = tensor.nnet.softmax(coeff.reshape(
(-1, self.k_gmm))).reshape(coeff.shape) + self.epsilon
cost = cost_gmm(target_features, mu, sigma, coeff)
next_x = sample_gmm(mu, sigma, coeff, self.theano_rng)
cost = (cost * mask).sum() / (mask.sum() + 1e-5) + 0. * start_flag
updates = []
updates.append((last_h1, h1[-1]))
updates.append((last_h2, h2[-1]))
updates.append((last_h3, h3[-1]))
updates.append((last_k, k[-1]))
updates.append((last_w, w[-1]))
attention_vars = [next_x, k, w, coeff, phi, pi_att]
return cost, scan_updates + updates, attention_vars
@application
def sample_model_fun(self, labels, labels_mask, speaker, num_samples,
seq_size):
initial_h1, last_h1, initial_h2, last_h2, initial_h3, last_h3, \
initial_w, last_w, initial_k, last_k = \
self.initial_states(num_samples)
initial_x = numpy.zeros((num_samples, self.output_dim), dtype=floatX)
cell_shape = (seq_size, num_samples, self.rnn_h_dim)
gat_shape = (seq_size, num_samples, 2 * self.rnn_h_dim)
cell_h1 = tensor.zeros(cell_shape, dtype=floatX)
cell_h2 = tensor.zeros(cell_shape, dtype=floatX)
cell_h3 = tensor.zeros(cell_shape, dtype=floatX)
gat_h1 = tensor.zeros(gat_shape, dtype=floatX)
gat_h2 = tensor.zeros(gat_shape, dtype=floatX)
gat_h3 = tensor.zeros(gat_shape, dtype=floatX)
if self.use_speaker:
speaker = speaker[:, 0]
emb_speaker = self.embed_speaker.apply(speaker)
# Applied before the broadcast.
spk_readout = self.speaker_to_readout.apply(emb_speaker)
spk_output = self.speaker_to_output.apply(emb_speaker)
# Add dimension to repeat with time.
emb_speaker = tensor.shape_padleft(emb_speaker)
spk_cell_h1, spk_gat_h1 = self.speaker_to_h1.apply(emb_speaker)
spk_cell_h2, spk_gat_h2 = self.speaker_to_h2.apply(emb_speaker)
spk_cell_h3, spk_gat_h3 = self.speaker_to_h3.apply(emb_speaker)
to_normalize = [
spk_cell_h1, spk_gat_h1, spk_cell_h2, spk_gat_h2, spk_cell_h3,
spk_gat_h3
]
spk_cell_h1, spk_gat_h1, spk_cell_h2, spk_gat_h2, \
spk_cell_h3, spk_gat_h3, = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
cell_h1 += spk_cell_h1
cell_h2 += spk_cell_h2
cell_h3 += spk_cell_h3
gat_h1 += spk_gat_h1
gat_h2 += spk_gat_h2
gat_h3 += spk_gat_h3
context_oh = self.encoder.apply(labels) * \
tensor.shape_padright(labels_mask)
u = tensor.shape_padleft(tensor.arange(labels.shape[1], dtype=floatX),
2)
def sample_step(inp_cell_h1_t, inp_gat_h1_t, inp_cell_h2_t,
inp_gat_h2_t, inp_cell_h3_t, inp_gat_h3_t, x_tm1,
h1_tm1, h2_tm1, h3_tm1, k_tm1, w_tm1):
cell_h1_t = inp_cell_h1_t
cell_h2_t = inp_cell_h2_t
cell_h3_t = inp_cell_h3_t
gat_h1_t = inp_gat_h1_t
gat_h2_t = inp_gat_h2_t
gat_h3_t = inp_gat_h3_t
attinp_h1, attgat_h1 = self.inp_to_h1.apply(w_tm1)
cell_h1_t += attinp_h1
gat_h1_t += attgat_h1
if self.weak_feedback:
out_cell_h1_t, out_gat_h1_t = self.out_to_h1.apply(x_tm1)
to_normalize = [out_cell_h1_t, out_gat_h1_t]
out_cell_h1_t, out_gat_h1_t = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
cell_h1_t += out_cell_h1_t
gat_h1_t += out_gat_h1_t
if self.full_feedback:
out_cell_h2_t, out_gat_h2_t = self.out_to_h2.apply(x_tm1)
out_cell_h3_t, out_gat_h3_t = self.out_to_h3.apply(x_tm1)
to_normalize = [
out_cell_h2_t, out_gat_h2_t, out_cell_h3_t, out_gat_h3_t
]
out_cell_h2_t, out_gat_h2_t, \
out_cell_h3_t, out_gat_h3_t = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
cell_h2_t += out_cell_h2_t
cell_h3_t += out_cell_h3_t
gat_h2_t += out_gat_h2_t
gat_h3_t += out_gat_h3_t
h1_t = self.rnn1.apply(cell_h1_t, gat_h1_t, h1_tm1, iterate=False)
a_t, b_t, k_t = self.h1_to_att.apply(h1_t)
if self.attention_type == "softmax":
a_t = tensor.nnet.softmax(a_t) + self.epsilon
else:
a_t = tensor.exp(a_t) + self.epsilon
b_t = tensor.exp(b_t) * self.sharpening_coeff + self.epsilon
k_t = k_tm1 + self.attention_alignment * \
tensor.exp(k_t) / self.timing_coeff
a_t_ = a_t
a_t = tensor.shape_padright(a_t)
b_t = tensor.shape_padright(b_t)
k_t_ = tensor.shape_padright(k_t)
# batch size X att size X len context
if self.attention_type == "softmax":
# numpy.sqrt(1/(2*numpy.pi)) is the weird number
phi_t = 0.3989422917366028 * tensor.sum(
a_t * tensor.sqrt(b_t) * tensor.exp(-0.5 * b_t *
(k_t_ - u)**2),
axis=1)
else:
phi_t = tensor.sum(a_t * tensor.exp(-b_t * (k_t_ - u)**2),
axis=1)
# batch size X len context X num letters
w_t = (tensor.shape_padright(phi_t) * context_oh).sum(axis=1)
attinp_h2, attgat_h2 = self.inp_to_h2.apply(w_t)
attinp_h3, attgat_h3 = self.inp_to_h3.apply(w_t)
cell_h2_t += attinp_h2
gat_h2_t += attgat_h2
cell_h3_t += attinp_h3
gat_h3_t += attgat_h3
h1inp_h2, h1gat_h2 = self.h1_to_h2.apply(h1_t)
h1inp_h3, h1gat_h3 = self.h1_to_h3.apply(h1_t)
to_normalize = [h1inp_h2, h1gat_h2, h1inp_h3, h1gat_h3]
h1inp_h2, h1gat_h2, h1inp_h3, h1gat_h3 = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
h2_t = self.rnn2.apply(cell_h2_t + h1inp_h2,
gat_h2_t + h1gat_h2,
h2_tm1,
iterate=False)
h2inp_h3, h2gat_h3 = self.h2_to_h3.apply(h2_t)
to_normalize = [h2inp_h3, h2gat_h3]
h2inp_h3, h2gat_h3 = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
h3_t = self.rnn3.apply(cell_h3_t + h1inp_h3 + h2inp_h3,
gat_h3_t + h1gat_h3 + h2gat_h3,
h3_tm1,
iterate=False)
h1_out_t = self.h1_to_readout.apply(h1_t)
h2_out_t = self.h2_to_readout.apply(h2_t)
h3_out_t = self.h3_to_readout.apply(h3_t)
to_normalize = [h1_out_t, h2_out_t, h3_out_t]
h1_out_t, h2_out_t, h3_out_t = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
readout_t = h1_out_t + h2_out_t + h3_out_t
readout_t += self.att_to_readout.apply(w_t)
if self.use_speaker:
readout_t += spk_readout
output_t = self.readout_to_output.apply(readout_t)
if self.which_cost == 'MSE':
predicted_x_t = output_t
if self.use_speaker:
predicted_x_t += spk_output
# Dummy value for coeff_t
coeff_t = predicted_x_t
elif self.which_cost == "GMM":
mu_t, sigma_t, coeff_t = output_t
if self.use_speaker:
mu_t += spk_output[0]
sigma_t += spk_output[1]
coeff_t += spk_output[2]
sigma_t = tensor.exp(sigma_t - self.sampling_bias) + \
self.epsilon
coeff_t = tensor.nnet.softmax(
coeff_t.reshape(
(-1, self.k_gmm)) * (1. + self.sampling_bias)).reshape(
coeff_t.shape) + self.epsilon
predicted_x_t = sample_gmm(mu_t, sigma_t, coeff_t,
self.theano_rng)
return predicted_x_t, h1_t, h2_t, h3_t, \
k_t, w_t, coeff_t, phi_t, a_t_
(sample_x, h1, h2, h3, k, w, pi, phi, pi_att), updates = theano.scan(
fn=sample_step,
sequences=[cell_h1, gat_h1, cell_h2, gat_h2, cell_h3, gat_h3],
non_sequences=[],
outputs_info=[
initial_x, initial_h1, initial_h2, initial_h3, initial_k,
initial_w, None, None, None
])
return sample_x, k, w, pi, phi, pi_att, updates
def sample_model(self, labels_tr, labels_mask_tr, features_mask_tr,
speaker_tr, num_samples, num_steps):
features, features_mask, labels, labels_mask, speaker, start_flag = \
self.symbolic_input_variables()
sample_x, k, w, pi, phi, pi_att, updates = \
self.sample_model_fun(
labels, labels_mask, speaker,
num_samples, num_steps)
theano_inputs = [labels, labels_mask]
numpy_inputs = (labels_tr, labels_mask_tr)
if self.use_speaker:
theano_inputs += [speaker]
numpy_inputs += (speaker_tr, )
return function(theano_inputs, [sample_x, k, w, pi, phi, pi_att],
updates=updates)(*numpy_inputs)
def sample_using_input(self, data_tr, num_samples):
# Used to predict the values using the dataset
features, features_mask, labels, labels_mask, speaker, start_flag = \
self.symbolic_input_variables()
cost, updates, attention_vars = self.compute_cost(
features, features_mask, labels, labels_mask, speaker, start_flag,
num_samples)
sample_x, k, w, pi, phi, pi_att = attention_vars
theano_vars = [
features, features_mask, labels, labels_mask, speaker, start_flag
]
theano_vars = [x for x in theano_vars if x is not None]
theano_vars = list(set(theano_vars))
theano_vars = {x.name: x for x in theano_vars}
theano_inputs = []
numpy_inputs = []
for key in data_tr.keys():
theano_inputs.append(theano_vars[key])
numpy_inputs.append(data_tr[key])
return function(theano_inputs, [sample_x, k, w, pi, phi, pi_att],
updates=updates)(*numpy_inputs)
class TestGatedRecurrent(unittest.TestCase):
def setUp(self):
self.gated = GatedRecurrent(
dim=3, weights_init=Constant(2),
activation=Tanh(), gate_activation=Tanh())
self.gated.initialize()
self.reset_only = GatedRecurrent(
dim=3, weights_init=IsotropicGaussian(),
activation=Tanh(), gate_activation=Tanh(),
use_update_gate=False, seed=1)
self.reset_only.initialize()
def test_one_step(self):
h0 = tensor.matrix('h0')
x = tensor.matrix('x')
z = tensor.matrix('z')
r = tensor.matrix('r')
h1 = self.gated.apply(x, z, r, h0, iterate=False)
next_h = theano.function(inputs=[h0, x, z, r], outputs=[h1])
h0_val = 0.1 * numpy.array([[1, 1, 0], [0, 1, 1]],
dtype=floatX)
x_val = 0.1 * numpy.array([[1, 2, 3], [4, 5, 6]],
dtype=floatX)
zi_val = (h0_val + x_val) / 2
ri_val = -x_val
W_val = 2 * numpy.ones((3, 3), dtype=floatX)
z_val = numpy.tanh(h0_val.dot(W_val) + zi_val)
r_val = numpy.tanh(h0_val.dot(W_val) + ri_val)
h1_val = (z_val * numpy.tanh((r_val * h0_val).dot(W_val) + x_val) +
(1 - z_val) * h0_val)
assert_allclose(h1_val, next_h(h0_val, x_val, zi_val, ri_val)[0],
rtol=1e-6)
def test_reset_only_many_steps(self):
x = tensor.tensor3('x')
ri = tensor.tensor3('ri')
mask = tensor.matrix('mask')
h = self.reset_only.apply(x, reset_inputs=ri, mask=mask)
calc_h = theano.function(inputs=[x, ri, mask], outputs=[h])
x_val = 0.1 * numpy.asarray(list(itertools.permutations(range(4))),
dtype=floatX)
x_val = numpy.ones((24, 4, 3), dtype=floatX) * x_val[..., None]
ri_val = 0.3 - x_val
mask_val = numpy.ones((24, 4), dtype=floatX)
mask_val[12:24, 3] = 0
h_val = numpy.zeros((25, 4, 3), dtype=floatX)
W = self.reset_only.state_to_state.get_value()
U = self.reset_only.state_to_reset.get_value()
for i in range(1, 25):
r_val = numpy.tanh(h_val[i - 1].dot(U) + ri_val[i - 1])
h_val[i] = numpy.tanh((r_val * h_val[i - 1]).dot(W) +
x_val[i - 1])
h_val[i] = (mask_val[i - 1, :, None] * h_val[i] +
(1 - mask_val[i - 1, :, None]) * h_val[i - 1])
h_val = h_val[1:]
# TODO Figure out why this tolerance needs to be so big
assert_allclose(h_val, calc_h(x_val, ri_val, mask_val)[0], 1e-03)
class GatedRecurrentFull(Initializable):
"""A wrapper around the GatedRecurrent brick that improves usability.
It contains:
* A fork to map to initialize the reset and the update units.
* Better initialization to initialize the different pieces
While this works, there is probably a better more elegant way to do this.
Parameters
----------
hidden_dim : int
dimension of the hidden state
activation : :class:`.Brick`
gate_activation: :class:`.Brick`
state_to_state_init: object
Weight Initialization
state_to_reset_init: object
Weight Initialization
state_to_update_init: obje64
Weight Initialization
input_to_state_transform: :class:`.Brick`
[CvMG14] uses Linear transform
input_to_reset_transform: :class:`.Brick`
[CvMG14] uses Linear transform
input_to_update_transform: :class:`.Brick`
[CvMG14] uses Linear transform
References
---------
self.rnn = GatedRecurrent(
weights_init=Constant(np.nan),
dim=self.hidden_dim,
activation=self.activation,
gate_activation=self.gate_activation)
.. [CvMG14] Kyunghyun Cho, Bart van Merriënboer, Çağlar Gülçehre,
Dzmitry Bahdanau, Fethi Bougares, Holger Schwenk, and Yoshua
Bengio, *Learning Phrase Representations using RNN Encoder-Decoder
for Statistical Machine Translation*, EMNLP (2014), pp. 1724-1734.
"""
@lazy(allocation=['hidden_dim', 'state_to_state_init', 'state_to_update_init', 'state_to_reset_init'],
initialization=['input_to_state_transform', 'input_to_update_transform', 'input_to_reset_transform'])
def __init__(self, hidden_dim, activation=None, gate_activation=None,
state_to_state_init=None, state_to_update_init=None, state_to_reset_init=None,
input_to_state_transform=None, input_to_update_transform=None, input_to_reset_transform=None,
**kwargs):
super(GatedRecurrentFull, self).__init__(**kwargs)
self.hidden_dim = hidden_dim
self.state_to_state_init = state_to_state_init
self.state_to_update_init = state_to_update_init
self.state_to_reset_init = state_to_reset_init
self.input_to_state_transform = input_to_state_transform
self.input_to_update_transform = input_to_update_transform
self.input_to_reset_transform = input_to_reset_transform
self.input_to_state_transform.name += "_input_to_state_transform"
self.input_to_update_transform.name += "_input_to_update_transform"
self.input_to_reset_transform.name += "_input_to_reset_transform"
self.use_mine = True
if self.use_mine:
self.rnn = GatedRecurrentFast(
weights_init=Constant(np.nan),
dim=self.hidden_dim,
activation=activation,
gate_activation=gate_activation)
else:
self.rnn = GatedRecurrent(
weights_init=Constant(np.nan),
dim=self.hidden_dim,
activation=activation,
gate_activation=gate_activation)
self.children = [self.rnn,
self.input_to_state_transform, self.input_to_update_transform, self.input_to_reset_transform]
self.children.extend(self.rnn.children)
def initialize(self):
super(GatedRecurrentFull, self).initialize()
self.input_to_state_transform.initialize()
self.input_to_update_transform.initialize()
self.input_to_reset_transform.initialize()
self.rnn.initialize()
weight_shape = (self.hidden_dim, self.hidden_dim)
state_to_state = self.state_to_state_init.generate(rng=self.rng, shape=weight_shape)
state_to_update= self.state_to_update_init.generate(rng=self.rng, shape=weight_shape)
state_to_reset = self.state_to_reset_init.generate(rng=self.rng, shape=weight_shape)
self.rnn.state_to_state.set_value(state_to_state)
if self.use_mine:
self.rnn.state_to_update.set_value(state_to_update)
self.rnn.state_to_reset.set_value(state_to_reset)
else:
self.rnn.state_to_gates.set_value(np.hstack((state_to_update, state_to_reset)))
@application(inputs=['input_'], outputs=['output'])
def apply(self, input_, mask=None):
"""
Parameters
----------
inputs_ : :class:`~tensor.TensorVariable`
sequence to feed into GRU. Axes are mb, sequence, features
mask : :class:`~tensor.TensorVariable`
A 1D binary array with 1 or 0 to represent data given available.
Returns
-------
output: :class:`theano.tensor.TensorVariable`
sequence to feed out. Axes are batch, sequence, features
"""
states_from_in = self.input_to_state_transform.apply(input_)
update_from_in = self.input_to_update_transform.apply(input_)
reset_from_in = self.input_to_reset_transform.apply(input_)
gate_inputs = tensor.concatenate([update_from_in, reset_from_in], axis=2)
if self.use_mine:
output = self.rnn.apply(inputs=states_from_in, update_inputs=update_from_in, reset_inputs=reset_from_in, mask=mask)
else:
output = self.rnn.apply(inputs=states_from_in, gate_inputs=gate_inputs)
return output
class Parrot(Initializable, Random):
def __init__(
self,
input_dim=420, # Dimension of the text labels
output_dim=63, # Dimension of vocoder fram
rnn_h_dim=1024, # Size of rnn hidden state
readouts_dim=1024, # Size of readouts (summary of rnn)
weak_feedback=False, # Feedback to the top rnn layer
full_feedback=False, # Feedback to all rnn layers
feedback_noise_level=None, # Amount of noise in feedback
layer_norm=False, # Use simple normalization?
use_speaker=False, # Condition on the speaker id?
num_speakers=21, # How many speakers there are?
speaker_dim=128, # Size of speaker embedding
which_cost='MSE', # Train with MSE or GMM
k_gmm=20, # How many components in the GMM
sampling_bias=0, # Make samples more likely (Graves13)
epsilon=1e-5, # Numerical stabilities
num_characters=43, # how many chars in the labels
attention_type='graves', # graves or softmax
attention_size=10, # number of gaussians in the attention
attention_alignment=1., # audio steps per letter at initialization
sharpening_coeff=1.,
timing_coeff=1.,
encoder_type=None,
encoder_dim=128,
raw_output=False,
**kwargs):
super(Parrot, self).__init__(**kwargs)
self.input_dim = input_dim
self.output_dim = output_dim
self.rnn_h_dim = rnn_h_dim
self.readouts_dim = readouts_dim
self.layer_norm = layer_norm
self.which_cost = which_cost
self.use_speaker = use_speaker
self.full_feedback = full_feedback
self.feedback_noise_level = feedback_noise_level
self.epsilon = epsilon
self.num_characters = num_characters
self.attention_type = attention_type
self.attention_alignment = attention_alignment
self.attention_size = attention_size
self.sharpening_coeff = sharpening_coeff
self.timing_coeff = timing_coeff
self.encoder_type = encoder_type
self.encoder_dim = encoder_dim
self.encoded_input_dim = input_dim
self.raw_output = raw_output
if self.encoder_type == 'bidirectional':
self.encoded_input_dim = 2 * encoder_dim
if self.feedback_noise_level is not None:
self.noise_level_var = tensor.scalar('feedback_noise_level')
self.rnn1 = GatedRecurrent(dim=rnn_h_dim, name='rnn1')
self.rnn2 = GatedRecurrent(dim=rnn_h_dim, name='rnn2')
self.rnn3 = GatedRecurrent(dim=rnn_h_dim, name='rnn3')
self.h1_to_readout = Linear(
input_dim=rnn_h_dim,
output_dim=readouts_dim,
name='h1_to_readout')
self.h2_to_readout = Linear(
input_dim=rnn_h_dim,
output_dim=readouts_dim,
name='h2_to_readout')
self.h3_to_readout = Linear(
input_dim=rnn_h_dim,
output_dim=readouts_dim,
name='h3_to_readout')
self.h1_to_h2 = Fork(
output_names=['rnn2_inputs', 'rnn2_gates'],
input_dim=rnn_h_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='h1_to_h2')
self.h1_to_h3 = Fork(
output_names=['rnn3_inputs', 'rnn3_gates'],
input_dim=rnn_h_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='h1_to_h3')
self.h2_to_h3 = Fork(
output_names=['rnn3_inputs', 'rnn3_gates'],
input_dim=rnn_h_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='h2_to_h3')
if which_cost == 'MSE':
self.readout_to_output = Linear(
input_dim=readouts_dim,
output_dim=output_dim,
name='readout_to_output')
elif which_cost == 'GMM':
self.sampling_bias = sampling_bias
self.k_gmm = k_gmm
self.readout_to_output = Fork(
output_names=['gmm_mu', 'gmm_sigma', 'gmm_coeff'],
input_dim=readouts_dim,
output_dims=[output_dim * k_gmm, output_dim * k_gmm, k_gmm],
name='readout_to_output')
self.encoder = Encoder(
encoder_type,
num_characters,
input_dim,
encoder_dim,
name='encoder')
self.children = [
self.encoder,
self.rnn1,
self.rnn2,
self.rnn3,
self.h1_to_readout,
self.h2_to_readout,
self.h3_to_readout,
self.h1_to_h2,
self.h1_to_h3,
self.h2_to_h3,
self.readout_to_output]
self.inp_to_h1 = Fork(
output_names=['rnn1_inputs', 'rnn1_gates'],
input_dim=self.encoded_input_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='inp_to_h1')
self.inp_to_h2 = Fork(
output_names=['rnn2_inputs', 'rnn2_gates'],
input_dim=self.encoded_input_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='inp_to_h2')
self.inp_to_h3 = Fork(
output_names=['rnn3_inputs', 'rnn3_gates'],
input_dim=self.encoded_input_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='inp_to_h3')
self.children += [
self.inp_to_h1,
self.inp_to_h2,
self.inp_to_h3]
self.h1_to_att = Fork(
output_names=['alpha', 'beta', 'kappa'],
input_dim=rnn_h_dim,
output_dims=[attention_size] * 3,
name='h1_to_att')
self.att_to_readout = Linear(
input_dim=self.encoded_input_dim,
output_dim=readouts_dim,
name='att_to_readout')
self.children += [
self.h1_to_att,
self.att_to_readout]
if use_speaker:
self.num_speakers = num_speakers
self.speaker_dim = speaker_dim
self.embed_speaker = LookupTable(num_speakers, speaker_dim)
self.speaker_to_h1 = Fork(
output_names=['rnn1_inputs', 'rnn1_gates'],
input_dim=speaker_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='speaker_to_h1')
self.speaker_to_h2 = Fork(
output_names=['rnn2_inputs', 'rnn2_gates'],
input_dim=speaker_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='speaker_to_h2')
self.speaker_to_h3 = Fork(
output_names=['rnn3_inputs', 'rnn3_gates'],
input_dim=speaker_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='speaker_to_h3')
self.speaker_to_readout = Linear(
input_dim=speaker_dim,
output_dim=readouts_dim,
name='speaker_to_readout')
if which_cost == 'MSE':
self.speaker_to_output = Linear(
input_dim=speaker_dim,
output_dim=output_dim,
name='speaker_to_output')
elif which_cost == 'GMM':
self.speaker_to_output = Fork(
output_names=['gmm_mu', 'gmm_sigma', 'gmm_coeff'],
input_dim=speaker_dim,
output_dims=[
output_dim * k_gmm, output_dim * k_gmm, k_gmm],
name='speaker_to_output')
self.children += [
self.embed_speaker,
self.speaker_to_h1,
self.speaker_to_h2,
self.speaker_to_h3,
self.speaker_to_readout,
self.speaker_to_output]
if full_feedback:
self.out_to_h2 = Fork(
output_names=['rnn2_inputs', 'rnn2_gates'],
input_dim=output_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='out_to_h2')
self.out_to_h3 = Fork(
output_names=['rnn3_inputs', 'rnn3_gates'],
input_dim=output_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='out_to_h3')
self.children += [
self.out_to_h2,
self.out_to_h3]
weak_feedback = True
self.weak_feedback = weak_feedback
if weak_feedback:
self.out_to_h1 = Fork(
output_names=['rnn1_inputs', 'rnn1_gates'],
input_dim=output_dim,
output_dims=[rnn_h_dim, 2 * rnn_h_dim],
name='out_to_h1')
self.children += [
self.out_to_h1]
if self.raw_output:
self.sampleRnn = SampleRnn()
self.children += [self.sampleRnn]
def _allocate(self):
self.initial_w = shared_floatx_zeros(
(self.encoded_input_dim,), name="initial_w")
add_role(self.initial_w, INITIAL_STATE)
def symbolic_input_variables(self):
features = tensor.tensor3('features')
features_mask = tensor.matrix('features_mask')
labels = tensor.imatrix('labels')
labels_mask = tensor.matrix('labels_mask')
start_flag = tensor.scalar('start_flag')
if self.use_speaker:
speaker = tensor.imatrix('speaker_index')
else:
speaker = None
if self.raw_output:
raw_sequence = tensor.itensor3('raw_audio')
else:
raw_sequence = None
return features, features_mask, labels, labels_mask, \
speaker, start_flag, raw_sequence
def initial_states(self, batch_size):
initial_h1 = self.rnn1.initial_states(batch_size)
initial_h2 = self.rnn2.initial_states(batch_size)
initial_h3 = self.rnn3.initial_states(batch_size)
last_h1 = shared_floatx_zeros((batch_size, self.rnn_h_dim))
last_h2 = shared_floatx_zeros((batch_size, self.rnn_h_dim))
last_h3 = shared_floatx_zeros((batch_size, self.rnn_h_dim))
# Defining for all
initial_k = tensor.zeros(
(batch_size, self.attention_size), dtype=floatX)
last_k = shared_floatx_zeros((batch_size, self.attention_size))
# Trainable initial state for w. Why not for k?
initial_w = tensor.repeat(self.initial_w[None, :], batch_size, 0)
last_w = shared_floatx_zeros((batch_size, self.encoded_input_dim))
return initial_h1, last_h1, initial_h2, last_h2, initial_h3, last_h3, \
initial_w, last_w, initial_k, last_k
@application
def compute_cost(
self, features, features_mask, labels, labels_mask,
speaker, start_flag, batch_size, raw_audio=None):
if speaker is None:
assert not self.use_speaker
target_features = features[1:]
mask = features_mask[1:]
cell_shape = (mask.shape[0], batch_size, self.rnn_h_dim)
gat_shape = (mask.shape[0], batch_size, 2 * self.rnn_h_dim)
cell_h1 = tensor.zeros(cell_shape, dtype=floatX)
cell_h2 = tensor.zeros(cell_shape, dtype=floatX)
cell_h3 = tensor.zeros(cell_shape, dtype=floatX)
gat_h1 = tensor.zeros(gat_shape, dtype=floatX)
gat_h2 = tensor.zeros(gat_shape, dtype=floatX)
gat_h3 = tensor.zeros(gat_shape, dtype=floatX)
if self.weak_feedback:
input_features = features[:-1]
if self.feedback_noise_level:
noise = self.theano_rng.normal(
size=input_features.shape,
avg=0., std=1.)
input_features += self.noise_level_var * noise
out_cell_h1, out_gat_h1 = self.out_to_h1.apply(input_features)
to_normalize = [
out_cell_h1, out_gat_h1]
out_cell_h1, out_gat_h1 = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
cell_h1 += out_cell_h1
gat_h1 += out_gat_h1
if self.full_feedback:
assert self.weak_feedback
out_cell_h2, out_gat_h2 = self.out_to_h2.apply(input_features)
out_cell_h3, out_gat_h3 = self.out_to_h3.apply(input_features)
to_normalize = [
out_cell_h2, out_gat_h2, out_cell_h3, out_gat_h3]
out_cell_h2, out_gat_h2, out_cell_h3, out_gat_h3 = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
cell_h2 += out_cell_h2
gat_h2 += out_gat_h2
cell_h3 += out_cell_h3
gat_h3 += out_gat_h3
if self.use_speaker:
speaker = speaker[:, 0]
emb_speaker = self.embed_speaker.apply(speaker)
emb_speaker = tensor.shape_padleft(emb_speaker)
spk_cell_h1, spk_gat_h1 = self.speaker_to_h1.apply(emb_speaker)
spk_cell_h2, spk_gat_h2 = self.speaker_to_h2.apply(emb_speaker)
spk_cell_h3, spk_gat_h3 = self.speaker_to_h3.apply(emb_speaker)
to_normalize = [
spk_cell_h1, spk_gat_h1, spk_cell_h2, spk_gat_h2,
spk_cell_h3, spk_gat_h3]
spk_cell_h1, spk_gat_h1, spk_cell_h2, spk_gat_h2, \
spk_cell_h3, spk_gat_h3, = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
cell_h1 = spk_cell_h1 + cell_h1
cell_h2 = spk_cell_h2 + cell_h2
cell_h3 = spk_cell_h3 + cell_h3
gat_h1 = spk_gat_h1 + gat_h1
gat_h2 = spk_gat_h2 + gat_h2
gat_h3 = spk_gat_h3 + gat_h3
initial_h1, last_h1, initial_h2, last_h2, initial_h3, last_h3, \
initial_w, last_w, initial_k, last_k = \
self.initial_states(batch_size)
# If it's a new example, use initial states.
input_h1 = tensor.switch(
start_flag, initial_h1, last_h1)
input_h2 = tensor.switch(
start_flag, initial_h2, last_h2)
input_h3 = tensor.switch(
start_flag, initial_h3, last_h3)
input_w = tensor.switch(
start_flag, initial_w, last_w)
input_k = tensor.switch(
start_flag, initial_k, last_k)
context_oh = self.encoder.apply(labels) * \
tensor.shape_padright(labels_mask)
u = tensor.shape_padleft(
tensor.arange(labels.shape[1], dtype=floatX), 2)
def step(
inp_h1_t, gat_h1_t, inp_h2_t, gat_h2_t, inp_h3_t, gat_h3_t,
h1_tm1, h2_tm1, h3_tm1, k_tm1, w_tm1, context_oh):
attinp_h1, attgat_h1 = self.inp_to_h1.apply(w_tm1)
inp_h1_t += attinp_h1
gat_h1_t += attgat_h1
h1_t = self.rnn1.apply(
inp_h1_t,
gat_h1_t,
h1_tm1, iterate=False)
a_t, b_t, k_t = self.h1_to_att.apply(h1_t)
if self.attention_type == "softmax":
a_t = tensor.nnet.softmax(a_t) + self.epsilon
else:
a_t = tensor.exp(a_t) + self.epsilon
b_t = tensor.exp(b_t) + self.epsilon
k_t = k_tm1 + self.attention_alignment * tensor.exp(k_t)
a_t_ = a_t
a_t = tensor.shape_padright(a_t)
b_t = tensor.shape_padright(b_t)
k_t_ = tensor.shape_padright(k_t)
# batch size X att size X len context
if self.attention_type == "softmax":
# numpy.sqrt(1/(2*numpy.pi)) is the weird number
phi_t = 0.3989422917366028 * tensor.sum(
a_t * tensor.sqrt(b_t) *
tensor.exp(-0.5 * b_t * (k_t_ - u)**2), axis=1)
else:
phi_t = tensor.sum(
a_t * tensor.exp(-b_t * (k_t_ - u)**2), axis=1)
# batch size X len context X num letters
w_t = (tensor.shape_padright(phi_t) * context_oh).sum(axis=1)
attinp_h2, attgat_h2 = self.inp_to_h2.apply(w_t)
attinp_h3, attgat_h3 = self.inp_to_h3.apply(w_t)
inp_h2_t += attinp_h2
gat_h2_t += attgat_h2
inp_h3_t += attinp_h3
gat_h3_t += attgat_h3
h1inp_h2, h1gat_h2 = self.h1_to_h2.apply(h1_t)
h1inp_h3, h1gat_h3 = self.h1_to_h3.apply(h1_t)
to_normalize = [
h1inp_h2, h1gat_h2, h1inp_h3, h1gat_h3]
h1inp_h2, h1gat_h2, h1inp_h3, h1gat_h3 = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
h2_t = self.rnn2.apply(
inp_h2_t + h1inp_h2,
gat_h2_t + h1gat_h2,
h2_tm1, iterate=False)
h2inp_h3, h2gat_h3 = self.h2_to_h3.apply(h2_t)
to_normalize = [
h2inp_h3, h2gat_h3]
h2inp_h3, h2gat_h3 = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
h3_t = self.rnn3.apply(
inp_h3_t + h1inp_h3 + h2inp_h3,
gat_h3_t + h1gat_h3 + h2gat_h3,
h3_tm1, iterate=False)
return h1_t, h2_t, h3_t, k_t, w_t, phi_t, a_t_
(h1, h2, h3, k, w, phi, pi_att), scan_updates = theano.scan(
fn=step,
sequences=[cell_h1, gat_h1, cell_h2, gat_h2, cell_h3, gat_h3],
non_sequences=[context_oh],
outputs_info=[
input_h1,
input_h2,
input_h3,
input_k,
input_w,
None,
None])
h1_out = self.h1_to_readout.apply(h1)
h2_out = self.h2_to_readout.apply(h2)
h3_out = self.h3_to_readout.apply(h3)
to_normalize = [
h1_out, h2_out, h3_out]
h1_out, h2_out, h3_out = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
readouts = h1_out + h2_out + h3_out
if self.use_speaker:
readouts += self.speaker_to_readout.apply(emb_speaker)
readouts += self.att_to_readout.apply(w)
predicted = self.readout_to_output.apply(readouts)
if self.which_cost == 'MSE':
if self.use_speaker:
predicted += self.speaker_to_output.apply(emb_speaker)
cost = tensor.sum((predicted - target_features) ** 2, axis=-1)
next_x = predicted
# Dummy value for coeff
coeff = predicted
elif self.which_cost == 'GMM':
mu, sigma, coeff = predicted
if self.use_speaker:
spk_to_out = self.speaker_to_output.apply(emb_speaker)
mu += spk_to_out[0]
sigma += spk_to_out[1]
coeff += spk_to_out[2]
# When training there should not be sampling_bias
sigma = tensor.exp(sigma) + self.epsilon
coeff = tensor.nnet.softmax(
coeff.reshape(
(-1, self.k_gmm))).reshape(
coeff.shape) + self.epsilon
cost = cost_gmm(target_features, mu, sigma, coeff)
next_x = sample_gmm(mu, sigma, coeff, self.theano_rng)
cost = (cost * mask).sum() / (mask.sum() + 1e-5) + 0. * start_flag
updates = []
updates.append((last_h1, h1[-1]))
updates.append((last_h2, h2[-1]))
updates.append((last_h3, h3[-1]))
updates.append((last_k, k[-1]))
updates.append((last_w, w[-1]))
cost_raw = None
if self.raw_output:
raw_mask = tensor.extra_ops.repeat(features_mask, 80, axis=0)
raw_mask = raw_mask.dimshuffle(1, 0)
# breakpointOp = PdbBreakpoint("Raw mask breakpoint")
# condition = tensor.gt(raw_mask.shape[0], 0)
# raw_mask = breakpointOp(condition, raw_mask)
predicted_transposed = predicted.dimshuffle(1, 0, 2)
last_h0, last_big_h0 = self.sampleRnn.initial_states(batch_size)
raw_audio_reshaped = raw_audio.dimshuffle(1, 0, 2)
raw_audio_reshaped = raw_audio_reshaped.reshape((raw_audio_reshaped.shape[0], -1))
cost_raw, ip_cost, all_params, ip_params, other_params, new_h0, new_big_h0 =\
self.sampleRnn.apply(raw_audio_reshaped, predicted_transposed, last_h0, last_big_h0, start_flag, raw_mask)
if self.sampleRnn.N_RNN == 1:
new_h0 = tensor.unbroadcast(new_h0, 1)
new_big_h0 = tensor.unbroadcast(new_big_h0, 1)
updates.append((last_h0, new_h0))
updates.append((last_big_h0, new_big_h0))
# cost = cost + 80.*cost_raw
alpha_ = numpy.float32(0.)
beta_ = numpy.float32(1.)
cost = alpha_*cost + beta_*cost_raw
attention_vars = [next_x, k, w, coeff, phi, pi_att]
return cost, scan_updates + updates, attention_vars, cost_raw
@application
def sample_model_fun(
self, labels, labels_mask, speaker, num_samples, seq_size):
initial_h1, last_h1, initial_h2, last_h2, initial_h3, last_h3, \
initial_w, last_w, initial_k, last_k = \
self.initial_states(num_samples)
initial_x = numpy.zeros(
(num_samples, self.output_dim), dtype=floatX)
cell_shape = (seq_size, num_samples, self.rnn_h_dim)
gat_shape = (seq_size, num_samples, 2 * self.rnn_h_dim)
cell_h1 = tensor.zeros(cell_shape, dtype=floatX)
cell_h2 = tensor.zeros(cell_shape, dtype=floatX)
cell_h3 = tensor.zeros(cell_shape, dtype=floatX)
gat_h1 = tensor.zeros(gat_shape, dtype=floatX)
gat_h2 = tensor.zeros(gat_shape, dtype=floatX)
gat_h3 = tensor.zeros(gat_shape, dtype=floatX)
if self.use_speaker:
speaker = speaker[:, 0]
emb_speaker = self.embed_speaker.apply(speaker)
# Applied before the broadcast.
spk_readout = self.speaker_to_readout.apply(emb_speaker)
spk_output = self.speaker_to_output.apply(emb_speaker)
# Add dimension to repeat with time.
emb_speaker = tensor.shape_padleft(emb_speaker)
spk_cell_h1, spk_gat_h1 = self.speaker_to_h1.apply(emb_speaker)
spk_cell_h2, spk_gat_h2 = self.speaker_to_h2.apply(emb_speaker)
spk_cell_h3, spk_gat_h3 = self.speaker_to_h3.apply(emb_speaker)
to_normalize = [
spk_cell_h1, spk_gat_h1, spk_cell_h2, spk_gat_h2,
spk_cell_h3, spk_gat_h3]
spk_cell_h1, spk_gat_h1, spk_cell_h2, spk_gat_h2, \
spk_cell_h3, spk_gat_h3, = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
cell_h1 += spk_cell_h1
cell_h2 += spk_cell_h2
cell_h3 += spk_cell_h3
gat_h1 += spk_gat_h1
gat_h2 += spk_gat_h2
gat_h3 += spk_gat_h3
context_oh = self.encoder.apply(labels) * \
tensor.shape_padright(labels_mask)
u = tensor.shape_padleft(
tensor.arange(labels.shape[1], dtype=floatX), 2)
def sample_step(
inp_cell_h1_t, inp_gat_h1_t, inp_cell_h2_t, inp_gat_h2_t,
inp_cell_h3_t, inp_gat_h3_t, x_tm1, h1_tm1, h2_tm1, h3_tm1,
k_tm1, w_tm1):
cell_h1_t = inp_cell_h1_t
cell_h2_t = inp_cell_h2_t
cell_h3_t = inp_cell_h3_t
gat_h1_t = inp_gat_h1_t
gat_h2_t = inp_gat_h2_t
gat_h3_t = inp_gat_h3_t
attinp_h1, attgat_h1 = self.inp_to_h1.apply(w_tm1)
cell_h1_t += attinp_h1
gat_h1_t += attgat_h1
if self.weak_feedback:
out_cell_h1_t, out_gat_h1_t = self.out_to_h1.apply(x_tm1)
to_normalize = [
out_cell_h1_t, out_gat_h1_t]
out_cell_h1_t, out_gat_h1_t = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
cell_h1_t += out_cell_h1_t
gat_h1_t += out_gat_h1_t
if self.full_feedback:
out_cell_h2_t, out_gat_h2_t = self.out_to_h2.apply(x_tm1)
out_cell_h3_t, out_gat_h3_t = self.out_to_h3.apply(x_tm1)
to_normalize = [
out_cell_h2_t, out_gat_h2_t,
out_cell_h3_t, out_gat_h3_t]
out_cell_h2_t, out_gat_h2_t, \
out_cell_h3_t, out_gat_h3_t = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
cell_h2_t += out_cell_h2_t
cell_h3_t += out_cell_h3_t
gat_h2_t += out_gat_h2_t
gat_h3_t += out_gat_h3_t
h1_t = self.rnn1.apply(
cell_h1_t,
gat_h1_t,
h1_tm1, iterate=False)
a_t, b_t, k_t = self.h1_to_att.apply(h1_t)
if self.attention_type == "softmax":
a_t = tensor.nnet.softmax(a_t) + self.epsilon
else:
a_t = tensor.exp(a_t) + self.epsilon
b_t = tensor.exp(b_t) * self.sharpening_coeff + self.epsilon
k_t = k_tm1 + self.attention_alignment * \
tensor.exp(k_t) / self.timing_coeff
a_t_ = a_t
a_t = tensor.shape_padright(a_t)
b_t = tensor.shape_padright(b_t)
k_t_ = tensor.shape_padright(k_t)
# batch size X att size X len context
if self.attention_type == "softmax":
# numpy.sqrt(1/(2*numpy.pi)) is the weird number
phi_t = 0.3989422917366028 * tensor.sum(
a_t * tensor.sqrt(b_t) *
tensor.exp(-0.5 * b_t * (k_t_ - u)**2), axis=1)
else:
phi_t = tensor.sum(
a_t * tensor.exp(-b_t * (k_t_ - u)**2), axis=1)
# batch size X len context X num letters
w_t = (tensor.shape_padright(phi_t) * context_oh).sum(axis=1)
attinp_h2, attgat_h2 = self.inp_to_h2.apply(w_t)
attinp_h3, attgat_h3 = self.inp_to_h3.apply(w_t)
cell_h2_t += attinp_h2
gat_h2_t += attgat_h2
cell_h3_t += attinp_h3
gat_h3_t += attgat_h3
h1inp_h2, h1gat_h2 = self.h1_to_h2.apply(h1_t)
h1inp_h3, h1gat_h3 = self.h1_to_h3.apply(h1_t)
to_normalize = [
h1inp_h2, h1gat_h2, h1inp_h3, h1gat_h3]
h1inp_h2, h1gat_h2, h1inp_h3, h1gat_h3 = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
h2_t = self.rnn2.apply(
cell_h2_t + h1inp_h2,
gat_h2_t + h1gat_h2,
h2_tm1, iterate=False)
h2inp_h3, h2gat_h3 = self.h2_to_h3.apply(h2_t)
to_normalize = [
h2inp_h3, h2gat_h3]
h2inp_h3, h2gat_h3 = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
h3_t = self.rnn3.apply(
cell_h3_t + h1inp_h3 + h2inp_h3,
gat_h3_t + h1gat_h3 + h2gat_h3,
h3_tm1, iterate=False)
h1_out_t = self.h1_to_readout.apply(h1_t)
h2_out_t = self.h2_to_readout.apply(h2_t)
h3_out_t = self.h3_to_readout.apply(h3_t)
to_normalize = [
h1_out_t, h2_out_t, h3_out_t]
h1_out_t, h2_out_t, h3_out_t = \
[_apply_norm(x, self.layer_norm) for x in to_normalize]
readout_t = h1_out_t + h2_out_t + h3_out_t
readout_t += self.att_to_readout.apply(w_t)
if self.use_speaker:
readout_t += spk_readout
output_t = self.readout_to_output.apply(readout_t)
if self.which_cost == 'MSE':
predicted_x_t = output_t
if self.use_speaker:
predicted_x_t += spk_output
# Dummy value for coeff_t
coeff_t = predicted_x_t
elif self.which_cost == "GMM":
mu_t, sigma_t, coeff_t = output_t
if self.use_speaker:
mu_t += spk_output[0]
sigma_t += spk_output[1]
coeff_t += spk_output[2]
sigma_t = tensor.exp(sigma_t - self.sampling_bias) + \
self.epsilon
coeff_t = tensor.nnet.softmax(
coeff_t.reshape(
(-1, self.k_gmm)) * (1. + self.sampling_bias)).reshape(
coeff_t.shape) + self.epsilon
predicted_x_t = sample_gmm(
mu_t, sigma_t, coeff_t, self.theano_rng)
return predicted_x_t, h1_t, h2_t, h3_t, \
k_t, w_t, coeff_t, phi_t, a_t_
(sample_x, h1, h2, h3, k, w, pi, phi, pi_att), updates = theano.scan(
fn=sample_step,
sequences=[
cell_h1,
gat_h1,
cell_h2,
gat_h2,
cell_h3,
gat_h3],
non_sequences=[],
outputs_info=[
initial_x,
initial_h1,
initial_h2,
initial_h3,
initial_k,
initial_w,
None,
None,
None])
return sample_x, k, w, pi, phi, pi_att, updates
def sample_model(
self, labels_tr, labels_mask_tr, features_mask_tr,
speaker_tr, num_samples, num_steps):
features, features_mask, labels, labels_mask, speaker, start_flag, raw_sequence = \
self.symbolic_input_variables()
sample_x, k, w, pi, phi, pi_att, updates = \
self.sample_model_fun(
labels, labels_mask, speaker,
num_samples, num_steps)
theano_inputs = [labels, labels_mask]
numpy_inputs = (labels_tr, labels_mask_tr)
if self.use_speaker:
theano_inputs += [speaker]
numpy_inputs += (speaker_tr,)
return function(
theano_inputs,
[sample_x, k, w, pi, phi, pi_att],
updates=updates)(*numpy_inputs)
def sample_using_input(self, data_tr, num_samples):
# Used to predict the values using the dataset
features, features_mask, labels, labels_mask, speaker, start_flag, raw_sequence = \
self.symbolic_input_variables()
cost, updates, attention_vars = self.compute_cost(
features, features_mask, labels, labels_mask,
speaker, start_flag, num_samples)
sample_x, k, w, pi, phi, pi_att = attention_vars
theano_vars = [
features, features_mask, labels, labels_mask, speaker, start_flag]
theano_vars = [x for x in theano_vars if x is not None]
theano_vars = list(set(theano_vars))
theano_vars = {x.name: x for x in theano_vars}
theano_inputs = []
numpy_inputs = []
for key in data_tr.keys():
theano_inputs.append(theano_vars[key])
numpy_inputs.append(data_tr[key])
return function(
theano_inputs, [sample_x, k, w, pi, phi, pi_att],
updates=updates)(*numpy_inputs)
class TestGatedRecurrent(unittest.TestCase):
def setUp(self):
self.gated = GatedRecurrent(
dim=3, activation=Tanh(),
gate_activation=Tanh(), weights_init=Constant(2))
self.gated.initialize()
self.reset_only = GatedRecurrent(
dim=3, activation=Tanh(),
gate_activation=Tanh(),
weights_init=IsotropicGaussian(), seed=1)
self.reset_only.initialize()
def test_one_step(self):
h0 = tensor.matrix('h0')
x = tensor.matrix('x')
gi = tensor.matrix('gi')
h1 = self.gated.apply(x, gi, h0, iterate=False)
next_h = theano.function(inputs=[h0, x, gi], outputs=[h1])
h0_val = 0.1 * numpy.array([[1, 1, 0], [0, 1, 1]],
dtype=theano.config.floatX)
x_val = 0.1 * numpy.array([[1, 2, 3], [4, 5, 6]],
dtype=theano.config.floatX)
zi_val = (h0_val + x_val) / 2
ri_val = -x_val
W_val = 2 * numpy.ones((3, 3), dtype=theano.config.floatX)
z_val = numpy.tanh(h0_val.dot(W_val) + zi_val)
r_val = numpy.tanh(h0_val.dot(W_val) + ri_val)
h1_val = (z_val * numpy.tanh((r_val * h0_val).dot(W_val) + x_val) +
(1 - z_val) * h0_val)
assert_allclose(
h1_val, next_h(h0_val, x_val, numpy.hstack([zi_val, ri_val]))[0],
rtol=1e-6)
def test_many_steps(self):
x = tensor.tensor3('x')
gi = tensor.tensor3('gi')
mask = tensor.matrix('mask')
h = self.reset_only.apply(x, gi, mask=mask)
calc_h = theano.function(inputs=[x, gi, mask], outputs=[h])
x_val = 0.1 * numpy.asarray(list(itertools.permutations(range(4))),
dtype=theano.config.floatX)
x_val = numpy.ones((24, 4, 3),
dtype=theano.config.floatX) * x_val[..., None]
ri_val = 0.3 - x_val
zi_val = 2 * ri_val
mask_val = numpy.ones((24, 4), dtype=theano.config.floatX)
mask_val[12:24, 3] = 0
h_val = numpy.zeros((25, 4, 3), dtype=theano.config.floatX)
W = self.reset_only.state_to_state.get_value()
Wz = self.reset_only.state_to_gates.get_value()[:, :3]
Wr = self.reset_only.state_to_gates.get_value()[:, 3:]
for i in range(1, 25):
z_val = numpy.tanh(h_val[i - 1].dot(Wz) + zi_val[i - 1])
r_val = numpy.tanh(h_val[i - 1].dot(Wr) + ri_val[i - 1])
h_val[i] = numpy.tanh((r_val * h_val[i - 1]).dot(W) +
x_val[i - 1])
h_val[i] = z_val * h_val[i] + (1 - z_val) * h_val[i - 1]
h_val[i] = (mask_val[i - 1, :, None] * h_val[i] +
(1 - mask_val[i - 1, :, None]) * h_val[i - 1])
h_val = h_val[1:]
# TODO Figure out why this tolerance needs to be so big
assert_allclose(
h_val,
calc_h(x_val, numpy.concatenate(
[zi_val, ri_val], axis=2), mask_val)[0],
1e-04)
# Also test that initial state is a parameter
initial_state, = VariableFilter(roles=[INITIAL_STATE])(
ComputationGraph(h))
assert is_shared_variable(initial_state)
assert initial_state.name == 'initial_state'
class TestGatedRecurrent(unittest.TestCase):
def setUp(self):
self.gated = GatedRecurrent(
dim=3, weights_init=Constant(2),
activation=Tanh(), gate_activation=Tanh())
self.gated.initialize()
self.reset_only = GatedRecurrent(
dim=3, weights_init=IsotropicGaussian(),
activation=Tanh(), gate_activation=Tanh(),
use_update_gate=False, rng=numpy.random.RandomState(1))
self.reset_only.initialize()
def test_one_step(self):
h0 = tensor.matrix('h0')
x = tensor.matrix('x')
z = tensor.matrix('z')
r = tensor.matrix('r')
h1 = self.gated.apply(x, z, r, h0, iterate=False)
next_h = theano.function(inputs=[h0, x, z, r], outputs=[h1])
h0_val = 0.1 * numpy.array([[1, 1, 0], [0, 1, 1]],
dtype=floatX)
x_val = 0.1 * numpy.array([[1, 2, 3], [4, 5, 6]],
dtype=floatX)
zi_val = (h0_val + x_val) / 2
ri_val = -x_val
W_val = 2 * numpy.ones((3, 3), dtype=floatX)
z_val = numpy.tanh(h0_val.dot(W_val) + zi_val)
r_val = numpy.tanh(h0_val.dot(W_val) + ri_val)
h1_val = (z_val * numpy.tanh((r_val * h0_val).dot(W_val) + x_val)
+ (1 - z_val) * h0_val)
assert_allclose(h1_val, next_h(h0_val, x_val, zi_val, ri_val)[0],
rtol=1e-6)
def test_reset_only_many_steps(self):
x = tensor.tensor3('x')
ri = tensor.tensor3('ri')
mask = tensor.matrix('mask')
h = self.reset_only.apply(x, reset_inputs=ri, mask=mask)
calc_h = theano.function(inputs=[x, ri, mask], outputs=[h])
x_val = 0.1 * numpy.asarray(list(itertools.permutations(range(4))),
dtype=floatX)
x_val = numpy.ones((24, 4, 3), dtype=floatX) * x_val[..., None]
ri_val = 0.3 - x_val
mask_val = numpy.ones((24, 4), dtype=floatX)
mask_val[12:24, 3] = 0
h_val = numpy.zeros((25, 4, 3), dtype=floatX)
W = self.reset_only.state_to_state.get_value()
U = self.reset_only.state_to_reset.get_value()
for i in range(1, 25):
r_val = numpy.tanh(h_val[i - 1].dot(U) + ri_val[i - 1])
h_val[i] = numpy.tanh((r_val * h_val[i - 1]).dot(W)
+ x_val[i - 1])
h_val[i] = (mask_val[i - 1, :, None] * h_val[i] +
(1 - mask_val[i - 1, :, None]) * h_val[i - 1])
h_val = h_val[1:]
# TODO Figure out why this tolerance needs to be so big
assert_allclose(h_val, calc_h(x_val, ri_val, mask_val)[0], 1e-03)
class Scribe(Initializable):
def __init__(self,
k=20,
rec_h_dim=400,
att_size=10,
num_letters=68,
sampling_bias=0.,
attention_type="graves",
epsilon=1e-6,
attention_alignment=1.,
**kwargs):
super(Scribe, self).__init__(**kwargs)
# For now only softmax and graves are supported.
assert attention_type in ["graves", "softmax"]
readouts_dim = 1 + 6 * k
self.k = k
self.rec_h_dim = rec_h_dim
self.att_size = att_size
self.num_letters = num_letters
self.sampling_bias = sampling_bias
self.attention_type = attention_type
self.epsilon = epsilon
self.attention_alignment = attention_alignment
self.cell1 = GatedRecurrent(dim=rec_h_dim, name='cell1')
self.inp_to_h1 = Fork(output_names=['cell1_inputs', 'cell1_gates'],
input_dim=3,
output_dims=[rec_h_dim, 2 * rec_h_dim],
name='inp_to_h1')
self.h1_to_readout = Linear(input_dim=rec_h_dim,
output_dim=readouts_dim,
name='h1_to_readout')
self.h1_to_att = Fork(output_names=['alpha', 'beta', 'kappa'],
input_dim=rec_h_dim,
output_dims=[att_size] * 3,
name='h1_to_att')
self.att_to_h1 = Fork(output_names=['cell1_inputs', 'cell1_gates'],
input_dim=num_letters,
output_dims=[rec_h_dim, 2 * rec_h_dim],
name='att_to_h1')
self.att_to_readout = Linear(input_dim=num_letters,
output_dim=readouts_dim,
name='att_to_readout')
self.emitter = BivariateGMMEmitter(k=k, sampling_bias=sampling_bias)
self.children = [
self.cell1, self.inp_to_h1, self.h1_to_readout, self.h1_to_att,
self.att_to_h1, self.att_to_readout, self.emitter
]
def _allocate(self):
self.initial_w = shared_floatx_zeros((self.num_letters, ),
name="initial_w")
add_role(self.initial_w, INITIAL_STATE)
def symbolic_input_variables(self):
data = tensor.tensor3('features')
data_mask = tensor.matrix('features_mask')
context = tensor.imatrix('transcripts')
context_mask = tensor.matrix('transcripts_mask')
start_flag = tensor.scalar('start_flag')
return data, data_mask, context, context_mask, start_flag
def initial_states(self, batch_size):
initial_h1 = self.cell1.initial_states(batch_size)
initial_kappa = shared_floatx_zeros((batch_size, self.att_size))
initial_w = tensor.repeat(self.initial_w[None, :], batch_size, 0)
last_h1 = shared_floatx_zeros((batch_size, self.rec_h_dim))
last_w = shared_floatx_zeros((batch_size, self.num_letters))
use_last_states = shared(numpy.asarray(0., dtype=floatX))
return initial_h1, initial_kappa, initial_w, \
last_h1, last_w, use_last_states
@application
def compute_cost(self, data, data_mask, context, context_mask, start_flag,
batch_size):
x = data[:-1]
target = data[1:]
mask = data_mask[1:]
xinp_h1, xgat_h1 = self.inp_to_h1.apply(x)
context_oh = one_hot(context, self.num_letters) * \
tensor.shape_padright(context_mask)
initial_h1, initial_kappa, initial_w, \
last_h1, last_w, use_last_states = \
self.initial_states(batch_size)
input_h1 = tensor.switch(use_last_states, last_h1, initial_h1)
input_w = tensor.switch(use_last_states, last_w, initial_w)
u = tensor.shape_padleft(tensor.arange(context.shape[1], dtype=floatX),
2)
def step(xinp_h1_t, xgat_h1_t, h1_tm1, k_tm1, w_tm1, ctx):
attinp_h1, attgat_h1 = self.att_to_h1.apply(w_tm1)
h1_t = self.cell1.apply(xinp_h1_t + attinp_h1,
xgat_h1_t + attgat_h1,
h1_tm1,
iterate=False)
a_t, b_t, k_t = self.h1_to_att.apply(h1_t)
if self.attention_type == "softmax":
a_t = tensor.nnet.softmax(a_t)
else:
a_t = tensor.exp(a_t)
b_t = tensor.exp(b_t) + self.epsilon
k_t = k_tm1 + self.attention_alignment * tensor.exp(k_t)
a_t = tensor.shape_padright(a_t)
b_t = tensor.shape_padright(b_t)
k_t_ = tensor.shape_padright(k_t)
# batch size X att size X len context
if self.attention_type == "softmax":
# numpy.sqrt(1/(2*numpy.pi)) is the weird number
phi_t = 0.3989422917366028 * tensor.sum(
a_t * tensor.sqrt(b_t) * tensor.exp(-0.5 * b_t *
(k_t_ - u)**2),
axis=1)
else:
phi_t = tensor.sum(a_t * tensor.exp(-b_t * (k_t_ - u)**2),
axis=1)
# batch size X len context X num letters
w_t = (tensor.shape_padright(phi_t) * ctx).sum(axis=1)
return h1_t, k_t, w_t
(h1, kappa, w), scan_updates = theano.scan(
fn=step,
sequences=[xinp_h1, xgat_h1],
non_sequences=[context_oh],
outputs_info=[input_h1, initial_kappa, input_w])
readouts = self.h1_to_readout.apply(h1) + \
self.att_to_readout.apply(w)
cost = self.emitter.cost(readouts, target)
cost = (cost * mask).sum() / (mask.sum() + 1e-5) + 0. * start_flag
updates = []
updates.append((last_h1, h1[-1]))
updates.append((initial_kappa,
tensor.switch(start_flag, 0. * initial_kappa,
kappa[-1])))
updates.append((last_w, w[-1]))
updates.append((use_last_states, 1. - start_flag))
return cost, scan_updates + updates
@application
def sample_model(self, context, context_mask, n_steps, batch_size):
initial_h1, initial_kappa, initial_w, \
last_h1, last_w, use_last_states = \
self.initial_states(batch_size)
initial_x = self.emitter.initial_outputs(batch_size)
context_oh = one_hot(context, self.num_letters) * \
tensor.shape_padright(context_mask)
u = tensor.shape_padleft(tensor.arange(context.shape[1], dtype=floatX),
2)
def sample_step(x_tm1, h1_tm1, k_tm1, w_tm1, ctx):
xinp_h1_t, xgat_h1_t = self.inp_to_h1.apply(x_tm1)
attinp_h1, attgat_h1 = self.att_to_h1.apply(w_tm1)
h1_t = self.cell1.apply(xinp_h1_t + attinp_h1,
xgat_h1_t + attgat_h1,
h1_tm1,
iterate=False)
a_t, b_t, k_t = self.h1_to_att.apply(h1_t)
if self.attention_type == "softmax":
a_t = tensor.nnet.softmax(a_t)
else:
a_t = tensor.exp(a_t)
b_t = tensor.exp(b_t) + self.epsilon
k_t = k_tm1 + self.attention_alignment * tensor.exp(k_t)
a_t = tensor.shape_padright(a_t)
b_t = tensor.shape_padright(b_t)
k_t_ = tensor.shape_padright(k_t)
# batch size X att size X len context
if self.attention_type == "softmax":
# numpy.sqrt(1/(2*numpy.pi)) is the weird number
phi_t = 0.3989422917366028 * tensor.sum(
a_t * tensor.sqrt(b_t) * tensor.exp(-0.5 * b_t *
(k_t_ - u)**2),
axis=1)
else:
phi_t = tensor.sum(a_t * tensor.exp(-b_t * (k_t_ - u)**2),
axis=1)
# batch size X len context X num letters
w_t = (tensor.shape_padright(phi_t) * ctx).sum(axis=1)
readout_t = self.h1_to_readout.apply(h1_t) + \
self.att_to_readout.apply(w_t)
x_t = self.emitter.emit(readout_t)
mu_t, sigma_t, corr_t, pi_t, penup_t = \
self.emitter.components(readout_t)
return x_t, h1_t, k_t, w_t, pi_t, phi_t, a_t
(sample_x, h1, k, w, pi, phi,
pi_att), updates = theano.scan(fn=sample_step,
n_steps=n_steps,
sequences=[],
non_sequences=[context_oh],
outputs_info=[
initial_x.eval(), initial_h1,
initial_kappa, initial_w, None,
None, None
])
return sample_x, pi, phi, pi_att, updates
def __init__(self, config):
inp = tensor.imatrix('bytes')
embed = theano.shared(config.embedding_matrix.astype(theano.config.floatX),
name='embedding_matrix')
in_repr = embed[inp.flatten(), :].reshape((inp.shape[0], inp.shape[1], config.repr_dim))
in_repr.name = 'in_repr'
bricks = []
states = []
# Construct predictive GRU hierarchy
hidden = []
costs = []
next_target = in_repr.dimshuffle(1, 0, 2)
for i, (hdim, cf, q) in enumerate(zip(config.hidden_dims,
config.cost_factors,
config.hidden_q)):
init_state = theano.shared(numpy.zeros((config.num_seqs, hdim)).astype(theano.config.floatX),
name='st0_%d'%i)
linear = Linear(input_dim=config.repr_dim, output_dim=3*hdim,
name="lstm_in_%d"%i)
lstm = GatedRecurrent(dim=hdim, activation=config.activation_function,
name="lstm_rec_%d"%i)
linear2 = Linear(input_dim=hdim, output_dim=config.repr_dim, name='lstm_out_%d'%i)
tanh = Tanh('lstm_out_tanh_%d'%i)
bricks += [linear, lstm, linear2, tanh]
if i > 0:
linear1 = Linear(input_dim=config.hidden_dims[i-1], output_dim=3*hdim,
name='lstm_in2_%d'%i)
bricks += [linear1]
next_target = tensor.cast(next_target, dtype=theano.config.floatX)
inter = linear.apply(theano.gradient.disconnected_grad(next_target))
if i > 0:
inter += linear1.apply(theano.gradient.disconnected_grad(hidden[-1][:-1,:,:]))
new_hidden = lstm.apply(inputs=inter[:,:,:hdim],
gate_inputs=inter[:,:,hdim:],
states=init_state)
states.append((init_state, new_hidden[-1, :, :]))
hidden += [tensor.concatenate([init_state[None,:,:], new_hidden],axis=0)]
pred = tanh.apply(linear2.apply(hidden[-1][:-1,:,:]))
costs += [numpy.float32(cf) * (-next_target * pred).sum(axis=2).mean()]
costs += [numpy.float32(cf) * q * abs(pred).sum(axis=2).mean()]
diff = next_target - pred
next_target = tensor.ge(diff, 0.5) - tensor.le(diff, -0.5)
# Construct output from hidden states
hidden = [s.dimshuffle(1, 0, 2) for s in hidden]
out_parts = []
out_dims = config.out_hidden + [config.io_dim]
for i, (dim, state) in enumerate(zip(config.hidden_dims, hidden)):
pred_linear = Linear(input_dim=dim, output_dim=out_dims[0],
name='pred_linear_%d'%i)
bricks.append(pred_linear)
lin = theano.gradient.disconnected_grad(state)
out_parts.append(pred_linear.apply(lin))
# Do prediction and calculate cost
out = sum(out_parts)
if len(out_dims) > 1:
out = config.out_hidden_act[0](name='out_act0').apply(out)
mlp = MLP(dims=out_dims,
activations=[x(name='out_act%d'%i) for i, x in enumerate(config.out_hidden_act[1:])]
+[Identity()],
name='out_mlp')
bricks.append(mlp)
out = mlp.apply(out.reshape((inp.shape[0]*(inp.shape[1]+1),-1))
).reshape((inp.shape[0],inp.shape[1]+1,-1))
pred = out.argmax(axis=2)
cost = Softmax().categorical_cross_entropy(inp.flatten(),
out[:,:-1,:].reshape((inp.shape[0]*inp.shape[1],
config.io_dim))).mean()
error_rate = tensor.neq(inp.flatten(), pred[:,:-1].flatten()).mean()
sgd_cost = cost + sum(costs)
# Initialize all bricks
for brick in bricks:
brick.weights_init = config.weights_init
brick.biases_init = config.biases_init
brick.initialize()
# apply noise
cg = ComputationGraph([sgd_cost, cost, error_rate]+costs)
if config.weight_noise > 0:
noise_vars = VariableFilter(roles=[WEIGHT])(cg)
cg = apply_noise(cg, noise_vars, config.weight_noise)
sgd_cost = cg.outputs[0]
cost = cg.outputs[1]
error_rate = cg.outputs[2]
costs = cg.outputs[3:]
# put stuff into self that is usefull for training or extensions
self.sgd_cost = sgd_cost
sgd_cost.name = 'sgd_cost'
for i in range(len(costs)):
costs[i].name = 'pred_cost_%d'%i
cost.name = 'cost'
error_rate.name = 'error_rate'
self.monitor_vars = [costs, [cost],
[error_rate]]
self.out = out[:,1:,:]
self.pred = pred[:,1:]
self.states = states
class GatedRecurrentFull(Initializable):
"""A wrapper around the GatedRecurrent brick that improves usability.
It contains:
* A fork to map to initialize the reset and the update units.
* Better initialization to initialize the different pieces
While this works, there is probably a better more elegant way to do this.
Parameters
----------
hidden_dim : int
dimension of the hidden state
activation : :class:`.Brick`
gate_activation: :class:`.Brick`
state_to_state_init: object
Weight Initialization
state_to_reset_init: object
Weight Initialization
state_to_update_init: obje64
Weight Initialization
input_to_state_transform: :class:`.Brick`
[CvMG14] uses Linear transform
input_to_reset_transform: :class:`.Brick`
[CvMG14] uses Linear transform
input_to_update_transform: :class:`.Brick`
[CvMG14] uses Linear transform
References
---------
self.rnn = GatedRecurrent(
weights_init=Constant(np.nan),
dim=self.hidden_dim,
activation=self.activation,
gate_activation=self.gate_activation)
.. [CvMG14] Kyunghyun Cho, Bart van Merriënboer, Çağlar Gülçehre,
Dzmitry Bahdanau, Fethi Bougares, Holger Schwenk, and Yoshua
Bengio, *Learning Phrase Representations using RNN Encoder-Decoder
for Statistical Machine Translation*, EMNLP (2014), pp. 1724-1734.
"""
@lazy(allocation=[
'hidden_dim', 'state_to_state_init', 'state_to_update_init',
'state_to_reset_init'
],
initialization=[
'input_to_state_transform', 'input_to_update_transform',
'input_to_reset_transform'
])
def __init__(self,
hidden_dim,
activation=None,
gate_activation=None,
state_to_state_init=None,
state_to_update_init=None,
state_to_reset_init=None,
input_to_state_transform=None,
input_to_update_transform=None,
input_to_reset_transform=None,
**kwargs):
super(GatedRecurrentFull, self).__init__(**kwargs)
self.hidden_dim = hidden_dim
self.state_to_state_init = state_to_state_init
self.state_to_update_init = state_to_update_init
self.state_to_reset_init = state_to_reset_init
self.input_to_state_transform = input_to_state_transform
self.input_to_update_transform = input_to_update_transform
self.input_to_reset_transform = input_to_reset_transform
self.input_to_state_transform.name += "_input_to_state_transform"
self.input_to_update_transform.name += "_input_to_update_transform"
self.input_to_reset_transform.name += "_input_to_reset_transform"
self.use_mine = True
if self.use_mine:
self.rnn = GatedRecurrentFast(weights_init=Constant(np.nan),
dim=self.hidden_dim,
activation=activation,
gate_activation=gate_activation)
else:
self.rnn = GatedRecurrent(weights_init=Constant(np.nan),
dim=self.hidden_dim,
activation=activation,
gate_activation=gate_activation)
self.children = [
self.rnn, self.input_to_state_transform,
self.input_to_update_transform, self.input_to_reset_transform
]
self.children.extend(self.rnn.children)
def initialize(self):
super(GatedRecurrentFull, self).initialize()
self.input_to_state_transform.initialize()
self.input_to_update_transform.initialize()
self.input_to_reset_transform.initialize()
self.rnn.initialize()
weight_shape = (self.hidden_dim, self.hidden_dim)
state_to_state = self.state_to_state_init.generate(rng=self.rng,
shape=weight_shape)
state_to_update = self.state_to_update_init.generate(
rng=self.rng, shape=weight_shape)
state_to_reset = self.state_to_reset_init.generate(rng=self.rng,
shape=weight_shape)
self.rnn.state_to_state.set_value(state_to_state)
if self.use_mine:
self.rnn.state_to_update.set_value(state_to_update)
self.rnn.state_to_reset.set_value(state_to_reset)
else:
self.rnn.state_to_gates.set_value(
np.hstack((state_to_update, state_to_reset)))
@application(inputs=['input_'], outputs=['output'])
def apply(self, input_, mask=None):
"""
Parameters
----------
inputs_ : :class:`~tensor.TensorVariable`
sequence to feed into GRU. Axes are mb, sequence, features
mask : :class:`~tensor.TensorVariable`
A 1D binary array with 1 or 0 to represent data given available.
Returns
-------
output: :class:`theano.tensor.TensorVariable`
sequence to feed out. Axes are batch, sequence, features
"""
states_from_in = self.input_to_state_transform.apply(input_)
update_from_in = self.input_to_update_transform.apply(input_)
reset_from_in = self.input_to_reset_transform.apply(input_)
gate_inputs = tensor.concatenate([update_from_in, reset_from_in],
axis=2)
if self.use_mine:
output = self.rnn.apply(inputs=states_from_in,
update_inputs=update_from_in,
reset_inputs=reset_from_in,
mask=mask)
else:
output = self.rnn.apply(inputs=states_from_in,
gate_inputs=gate_inputs)
return output
