def _create_network(self):
# Initialize autoencode network weights and biases
network_weights = self._initialize_weights(**self.network_architecture)
start_token_tensor=tf.constant((np.zeros([self.batch_size,binary_dim])).astype(np.float32),dtype=tf.float32)
self.network_weights=network_weights
seqlen=tf.cast(tf.reduce_sum(self.mask,reduction_indices=-1),tf.int32)
embedded_input,embedded_input_KLD_loss=self._get_word_embedding([network_weights['variational_encoding'],network_weights['biases_variational_encoding']],network_weights['input_meaning'],tf.reshape(self.caption_placeholder,[-1,self.network_architecture['n_input']]),logit=True)
embedded_input=tf.reshape(embedded_input,[-1,self.network_architecture['maxlen'],self.network_architecture['n_lstm_input']])
if not vanilla:
embedded_input_KLD_loss=tf.reshape(embedded_input_KLD_loss,[-1,self.network_architecture['maxlen']])[:,1:]
encoder_input=embedded_input[:,1:,:]
cell=tf.contrib.rnn.BasicLSTMCell(self.network_architecture['n_lstm_input'])
if lstm_stack>1:
cell=tf.contrib.rnn.MultiRNNCell([cell]*lstm_stack)
if not use_bdlstm:
encoder_outs,encoder_states=rnn.dynamic_rnn(cell,encoder_input,sequence_length=seqlen-1,dtype=tf.float32,time_major=False)
else:
backward_cell=tf.contrib.rnn.BasicLSTMCell(self.network_architecture['n_lstm_input'])
if lstm_stack>1:
backward_cell=tf.contrib.rnn.MultiRNNCell([backward_cell]*lstm_stack)
encoder_outs,encoder_states=rnn.bidirectional_dynamic_rnn(cell,backward_cell,encoder_input,sequence_length=seqlen-1,dtype=tf.float32,time_major=False)
ix_range=tf.range(0,self.batch_size,1)
ixs=tf.expand_dims(ix_range,-1)
to_cat=tf.expand_dims(seqlen-2,-1)
gather_inds=tf.concat([ixs,to_cat],axis=-1)
print encoder_outs
outs=tf.gather_nd(encoder_outs,gather_inds)
self.deb=tf.gather_nd(self.caption_placeholder[:,1:,:],gather_inds)
print outs.shape
outs=tf.nn.dropout(outs,.75)
input_embedding,input_embedding_KLD_loss=self._get_middle_embedding([network_weights['middle_encoding'],network_weights['biases_middle_encoding']],network_weights['middle_encoding'],outs,logit=True)
input_embedding=tf.nn.l2_normalize(input_embedding,dim=-1)
self.other_loss=tf.constant(0,dtype=tf.float32)
KLD_penalty=(tf.cast(self.timestep,tf.float32)/(800000/18.0))*1e-3
cos_penalty=tf.maximum(-0.1,(tf.cast(self.timestep,tf.float32)/(18.0)))*1e-3
input_KLD_loss=0
if form3:
_x,input_KLD_loss=self._get_input_embedding([network_weights['embmap'],network_weights['embmap_biases']],network_weights['embmap'])
input_KLD_loss=tf.reduce_mean(input_KLD_loss)*KLD_penalty#*tf.constant(0.0,dtype=tf.float32)
normed_embedding= tf.nn.l2_normalize(input_embedding, dim=-1)
normed_target=tf.nn.l2_normalize(_x,dim=-1)
cos_sim=(tf.reduce_sum(tf.multiply(normed_embedding,normed_target),axis=-1))
# self.exp_loss=tf.reduce_mean((-cos_sim))
# self.exp_loss=tf.reduce_sum(xentropy)/float(self.batch_size)
self.other_loss += tf.reduce_mean(1-(cos_sim))*cos_penalty
# self.other_loss+=tf.reduce_mean(tf.reduce_sum(tf.square(_x-input_embedding),axis=-1))*cos_penalty
# Use recognition network to determine mean and
# (log) variance of Gaussian distribution in latent
# space
# if not same_embedding:
# input_embedding,input_embedding_KLD_loss=self._get_input_embedding([network_weights['variational_encoding'],network_weights['biases_variational_encoding']],network_weights['input_meaning'])
# else:
# input_embedding,input_embedding_KLD_loss=self._get_input_embedding([network_weights['variational_encoding'],network_weights['biases_variational_encoding']],network_weights['LSTM'])
if not embeddings_trainable:
input_embedding=tf.stop_gradient(input_embedding)
# embed2decoder=tf.Variable(xavier_init(self.network_architecture['n_z_m_2'],self.network_architecture['n_lstm_input']),name='decoder_embedding_weight')
# embed2decoder_bias=tf.Variable(tf.zeros(self.network_architecture['n_lstm_input']),name='decoder_embedding_bias')
state = self.lstm.zero_state(self.batch_size, dtype=tf.float32)
# input_embedding=tf.matmul(input_embedding,embed2decoder)+embed2decoder_bias
loss = 0
# self.debug=0
probs=[]
with tf.variable_scope("RNN"):
for i in range(self.network_architecture['maxlen']):
if i > 0:
# current_embedding = tf.nn.embedding_lookup(self.word_embedding, caption_placeholder[:,i-1]) + self.embedding_bias
if form4:
current_embedding,KLD_loss=input_embedding,0
elif form2:
current_embedding,KLD_loss = self._get_word_embedding([network_weights['variational_encoding'],network_weights['biases_variational_encoding']],network_weights['LSTM'], self.caption_placeholder[:,i-1,:],logit=True)
else:
current_embedding,KLD_loss = self._get_word_embedding([network_weights['variational_encoding'],network_weights['biases_variational_encoding']],network_weights['LSTM'], self.caption_placeholder[:,i-1])
loss+=tf.reduce_sum(KLD_loss*self.mask[:,i])*KLD_penalty
else:
current_embedding = input_embedding
if i > 0:
tf.get_variable_scope().reuse_variables()
out, state = self.lstm(current_embedding, state)
if i > 0:
if not form2:
labels = tf.expand_dims(self.caption_placeholder[:, i], 1)
ix_range=tf.range(0, self.batch_size, 1)
ixs = tf.expand_dims(ix_range, 1)
concat = tf.concat([ixs, labels],1)
onehot = tf.sparse_to_dense(
concat, tf.stack([self.batch_size, self.n_words]), 1.0, 0.0)
else:
onehot=self.caption_placeholder[:,i,:]
logit = tf.matmul(out, network_weights['LSTM']['encoding_weight']) + network_weights['LSTM']['encoding_bias']
if not use_ctc:
if form2:
# best_word=tf.nn.softmax(logit)
# best_word=tf.round(best_word)
# all_the_f_one_h.append(best_word)
xentropy = tf.nn.sigmoid_cross_entropy_with_logits(logits=logit, labels=onehot)
xentropy=tf.reduce_sum(xentropy,reduction_indices=-1)
else:
xentropy = tf.nn.softmax_cross_entropy_with_logits(logits=logit, labels=onehot)
xentropy = xentropy * self.mask[:,i]
xentropy=tf.reduce_sum(xentropy)
# self.debug+=xentropy
loss += xentropy
else:
probs.append(tf.expand_dims(tf.nn.sigmoid(logit),1))
self.debug=[input_KLD_loss,tf.reduce_mean(input_embedding_KLD_loss)]
# self.debug=[tf.reshape(self.debug[0],[self.batch_size,self.network_architecture['maxlen'],-1])[:,1,:],self.debug[2]]
# self.debug+=[_x,input_embedding, outs]
# self.debug+=[input_embedding, outs]
self.debug=[self.other_loss,cos_penalty]
if not use_ctc:
loss_ctc=0
# self.debug=self.other_loss
# self.debug=[input_KLD_loss,embedded_input_KLD_loss,input_embedding_KLD_loss]
else:
probs=tf.concat(probs,axis=1)
probs=ctc_loss.get_output_probabilities(probs,self.caption_placeholder[:,1:,:])
loss_ctc=ctc_loss.loss(probs,self.caption_placeholder[:,1:,:],self.network_architecture['maxlen']-2,self.batch_size,seqlen-1)
self.debug=loss_ctc
#
loss = (loss / tf.reduce_sum(self.mask[:,1:]))+tf.reduce_sum(input_embedding_KLD_loss)/self.batch_size*KLD_penalty+tf.reduce_sum(embedded_input_KLD_loss*self.mask[:,1:])/tf.reduce_sum(self.mask[:,1:])*KLD_penalty+loss_ctc+input_KLD_loss+self.other_loss
self.loss=loss
def _create_network(self):
# Initialize autoencode network weights and biases
network_weights = self._initialize_weights(**self.network_architecture)
start_token_tensor = tf.constant(
(np.zeros([self.batch_size, binary_dim])).astype(np.float32),
dtype=tf.float32)
self.network_weights = network_weights
seqlen = tf.cast(tf.reduce_sum(self.mask, reduction_indices=-1),
tf.int32)
KLD_penalty = tf.tanh(tf.cast(self.global_step, tf.float32) / 1600.0)
# Use recognition network to determine mean and
# (log) variance of Gaussian distribution in latent
# space
if not same_embedding:
input_embedding, input_embedding_KLD_loss = self._get_input_embedding(
[
network_weights['variational_encoding'],
network_weights['biases_variational_encoding']
], network_weights['input_meaning'])
else:
input_embedding, input_embedding_KLD_loss = self._get_input_embedding(
[
network_weights['variational_encoding'],
network_weights['biases_variational_encoding']
], network_weights['LSTM'])
state = self.lstm.zero_state(self.batch_size, dtype=tf.float32)
loss = 0
self.debug = 0
probs = []
with tf.variable_scope("RNN"):
for i in range(self.network_architecture['maxlen']):
if i > 0:
# current_embedding = tf.nn.embedding_lookup(self.word_embedding, caption_placeholder[:,i-1]) + self.embedding_bias
if form2:
current_embedding, KLD_loss = self._get_word_embedding(
[
network_weights['variational_encoding'],
network_weights['biases_variational_encoding']
],
network_weights['LSTM'],
self.caption_placeholder[:, i - 1, :],
logit=True)
else:
current_embedding, KLD_loss = self._get_word_embedding(
[
network_weights['variational_encoding'],
network_weights['biases_variational_encoding']
], network_weights['LSTM'],
self.caption_placeholder[:, i - 1])
if transfertype2:
current_embedding = tf.stop_gradient(current_embedding)
loss += tf.reduce_sum(
KLD_loss * self.mask[:, i]) * KLD_penalty
else:
current_embedding = input_embedding
if i > 0:
tf.get_variable_scope().reuse_variables()
out, state = self.lstm(current_embedding, state)
if i > 0:
if not form2:
labels = tf.expand_dims(self.caption_placeholder[:, i],
1)
ix_range = tf.range(0, self.batch_size, 1)
ixs = tf.expand_dims(ix_range, 1)
concat = tf.concat([ixs, labels], 1)
onehot = tf.sparse_to_dense(
concat, tf.stack([self.batch_size, self.n_words]),
1.0, 0.0)
else:
onehot = self.caption_placeholder[:, i, :]
logit = tf.matmul(
out, network_weights['LSTM']['encoding_weight']
) + network_weights['LSTM']['encoding_bias']
if not use_ctc:
if form2:
# best_word=tf.nn.softmax(logit)
# best_word=tf.round(best_word)
# all_the_f_one_h.append(best_word)
xentropy = tf.nn.sigmoid_cross_entropy_with_logits(
logits=logit, labels=onehot)
xentropy = tf.reduce_sum(xentropy,
reduction_indices=-1)
else:
xentropy = tf.nn.softmax_cross_entropy_with_logits(
logits=logit, labels=onehot)
xentropy = xentropy * self.mask[:, i]
xentropy = tf.reduce_sum(xentropy)
self.debug += xentropy
loss += xentropy
else:
probs.append(tf.expand_dims(tf.nn.sigmoid(logit), 1))
if not use_ctc:
loss_ctc = 0
else:
probs = tf.concat(probs, axis=1)
probs = ctc_loss.get_output_probabilities(
probs, self.caption_placeholder[:, 1:, :])
loss_ctc = ctc_loss.loss(
probs, self.caption_placeholder[:, 1:, :],
self.network_architecture['maxlen'] - 2, self.batch_size,
seqlen - 1)
self.debug = loss_ctc
# self.debug/=tf.reduce_sum(self.mask[:,1:])
loss = (loss / tf.reduce_sum(self.mask[:, 1:])) + tf.reduce_sum(
input_embedding_KLD_loss
) / self.batch_size * KLD_penalty + loss_ctc
self.loss = loss