def __call__(self, inputs, state, timestep=0, scope=None):
current_state = state
for highway_layer in range(self.num_highway_layers):
with tf.variable_scope('highway_factor_{}'.format(highway_layer)):
if self.use_inputs_on_each_layer or highway_layer == 0:
highway_factor = tf.tanh(multiplicative_integration(
[inputs, current_state], self._num_units))
else:
highway_factor = tf.tanh(layer_norm(
linear([current_state], self._num_units, True)))
with tf.variable_scope('gate_for_highway_factor_{}'.format(highway_layer)):
if self.use_inputs_on_each_layer or highway_layer == 0:
gate_for_highway_factor = tf.sigmoid(multiplicative_integration(
[inputs, current_state], self._num_units, initial_bias_value=-3.0))
else:
gate_for_highway_factor = tf.sigmoid(
linear([current_state], self._num_units, True, -3.0))
gate_for_hidden_factor = 1 - gate_for_highway_factor
if self.use_recurrent_dropout and self.is_training:
highway_factor = tf.nn.dropout(
highway_factor, self.recurrent_dropout_factor)
current_state = highway_factor * gate_for_highway_factor + \
current_state * gate_for_hidden_factor
return current_state, current_state
def __call__(self, inputs, state, timestep=0, scope=None):
'''Normal Gated recurrent unit (GRU) with nunits cells.'''
with tf.variable_scope(scope or type(self).__name__): # 'GRUCell'
with tf.variable_scope('Gates'): # Reset gate and update gate.
# We start with bias of 1.0 to not reset and not update.
r, u = tf.split(
value=tf.sigmoid(
multiplicative_integration(
[inputs, state],
output_size=self._num_units * 2, initial_bias_value=1.0)),
num_or_size_splits=2, axis=1)
# you need a different one because you're doing a new linear
with tf.variable_scope('Candidate'):
# notice they have the activation/non-linear step right here!
c = tf.tanh(multiplicative_integration(
[inputs, state], self._num_units, 0.0))
if self.use_recurrent_dropout and self.is_training:
input_contribution = tf.nn.dropout(
c, self.recurrent_dropout_factor)
else:
input_contribution = c
new_h = u * state + (1 - u) * input_contribution
return new_h, new_h
def __call__(self, inputs, state, timestep=0, scope=None):
'''Most basic RNN: output = new_state = tanh(W * input + U * state + B).'''
current_state = state
for highway_layer in range(self.num_highway_layers):
with tf.variable_scope('highway_factor_{}'.format(highway_layer)):
if self.use_inputs_on_each_layer or highway_layer == 0:
highway_factor = tf.tanh(
multiplicative_integration(
[inputs, current_state], output_size=self._num_units))
else:
highway_factor = tf.tanh(
linear([current_state], output_size=self._num_units, bias=True))
with tf.variable_scope('gate_for_highway_factor_{}'.format(highway_layer)):
if self.use_inputs_on_each_layer or highway_layer == 0:
gate_for_highway_factor = tf.sigmoid(multiplicative_integration(
[inputs, current_state], self._num_units, initial_bias_value=-3.0))
else:
gate_for_highway_factor = tf.sigmoid(
linear([current_state], output_size=self._num_units,
bias=True, bias_start=-3.0))
gate_for_hidden_factor = 1 - gate_for_highway_factor
if self.use_recurrent_dropout and self.is_training:
highway_factor = tf.nn.dropout(
highway_factor, keep_prob=self.recurrent_dropout_factor)
current_state = (highway_factor * gate_for_highway_factor +
current_state * gate_for_hidden_factor)
return current_state, current_state
def __call__(self, inputs, state, timestep=0, scope=None):
# with tf.device('/gpu:'+str(self._gpu_for_layer)):
'''Long short-term memory cell (LSTM).'''
with tf.variable_scope(scope or type(self).__name__): # 'BasicLSTMCell'
# Parameters of gates are concatenated into one multiply for
# efficiency.
h, c = tf.split(value=state, num_or_size_splits=2, axis=1)
concat = multiplicative_integration(
[inputs, h], output_size=self._num_units * 4, initial_bias_value=0.0)
# i = input_gate, j = new_input, f = forget_gate, o = output_gate
i, j, f, o = tf.split(value=concat, num_or_size_splits=4, axis=1)
if self.use_recurrent_dropout and self.is_training:
input_contribution = tf.nn.dropout(
tf.tanh(j), keep_prob=self.recurrent_dropout_factor)
else:
input_contribution = tf.tanh(j)
new_c = c * tf.sigmoid(f + self._forget_bias) + tf.sigmoid(i) * input_contribution
new_h = tf.tanh(new_c) * tf.sigmoid(o)
# purposely reversed
return new_h, tf.concat(axis=1, values=[new_h, new_c])
def __call__(self, inputs, state, timestep=0, scope=None):
with tf.variable_scope(scope or type(self).__name__):
# Forget Gate bias starts as 1.0 -- TODO: double check if this is correct
with tf.variable_scope('Gates'):
if self.use_multiplicative_integration:
gated_factor = multiplicative_integration(
[inputs, state], self._num_units,
self.forget_bias_initialization)
else:
gated_factor = linear([inputs, state], self._num_units,
True,
self.forget_bias_initialization)
gated_factor = tf.sigmoid(gated_factor)
with tf.variable_scope('Candidate'):
c = tf.tanh(linear([inputs], self._num_units, True, 0.0))
if self.use_recurrent_dropout and self.is_training:
input_contribution = tf.nn.dropout(
c, self.recurrent_dropout_factor)
else:
input_contribution = c
new_h = (1 -
gated_factor) * state + gated_factor * input_contribution
return new_h, new_h
def __call__(self, inputs, state, timestep=0, scope=None):
'''Most basic RNN: output = new_state = tanh(W * input + U * state + B).
'''
# with tf.device('/gpu:'+str(self._gpu_for_layer)):
with tf.variable_scope(scope or type(self).__name__): # 'BasicRNNCell'
output = tf.tanh(multiplicative_integration(
[inputs, state], self._num_units))
return output, output
def __call__(self, inputs, state, timestep=0, scope=None):
'''Normal Gated recurrent unit (GRU) with nunits cells.'''
with tf.variable_scope(scope or type(self).__name__): # 'GRUCell'
with tf.variable_scope('Inputs'):
inputs_concat = linear(
[inputs], self._num_units * 2, False, 1.0)
inputs_concat = layer_norm(
inputs_concat, num_variables_in_tensor=2, initial_bias_value=1.0)
with tf.variable_scope('Hidden_State'):
hidden_state_concat = linear(
[state], self._num_units * 2, False)
hidden_state_concat = layer_norm(
hidden_state_concat, num_variables_in_tensor=2)
r, u = tf.split(
value=tf.sigmoid(
multiplicative_integration(
[inputs_concat, hidden_state_concat],
output_size=2 * self._num_units, initial_bias_value=1.0,
weights_already_calculated=True)),
num_or_size_splits=2, axis=1)
with tf.variable_scope('Candidate'):
with tf.variable_scope('input_portion'):
input_portion = layer_norm(
linear([inputs], output_size=self._num_units, bias=False))
with tf.variable_scope('reset_portion'):
reset_portion = r * layer_norm(linear([state], self._num_units, False))
c = tf.tanh(
multiplicative_integration(
[input_portion, reset_portion],
output_size=self._num_units, initial_bias_value=0.0,
weights_already_calculated=True))
new_h = u * state + (1 - u) * c
return new_h, new_h
def __call__(self, inputs, state, timestep=0, scope=None):
'''Long short-term memory cell (LSTM).
The idea with iteration would be to run different batch norm mean
and variance stats on timestep greater than 10.
'''
with tf.variable_scope(scope or type(self).__name__): # 'BasicLSTMCell'
# Parameters of gates are concatenated into one multiply for
# efficiency.
h, c = tf.split(value=state, num_or_size_splits=2, axis=1)
'''note that bias is set to 0 because batch norm bias is added later'''
with tf.variable_scope('inputs_weight_matrix'):
inputs_concat = linear([inputs], output_size=4 * self._num_units, bias=False)
inputs_concat = layer_norm(
inputs_concat, num_variables_in_tensor=4, scope='inputs_concat_layer_norm')
with tf.variable_scope('state_weight_matrix'):
h_concat = linear([h], 4 * self._num_units, False)
h_concat = layer_norm(
h_concat, num_variables_in_tensor=4, scope='h_concat_layer_norm')
i, j, f, o = tf.split(
value=multiplicative_integration(
[inputs_concat, h_concat],
output_size=4 * self._num_units, initial_bias_value=0.0,
weights_already_calculated=True),
num_or_size_splits=4, axis=1)
new_c = c * tf.sigmoid(f + self._forget_bias) + tf.sigmoid(i) * tf.tanh(j)
'''apply layer norm to the hidden state transition'''
with tf.variable_scope('layer_norm_hidden_state'):
new_h = tf.tanh(layer_norm(new_c)) * tf.sigmoid(o)
return new_h, tf.concat(axis=1, values=[new_h, new_c]) # reversed this
def __call__(self, inputs, state, timestep=0, scope=None):
with tf.variable_scope(scope
or type(self).__name__): # 'BasicLSTMCell'
# Parameters of gates are concatenated into one multiply for efficiency.
hidden_state_plus_c_list = tf.split(
state, num_or_size_splits=self.num_memory_arrays + 1, axis=1)
h = hidden_state_plus_c_list[0]
c_list = hidden_state_plus_c_list[1:]
## very large matrix multiplication to speed up procedure
## -- will split variables out later
if self.use_multiplicative_integration:
concat = multiplicative_integration(
[inputs, h], self._num_units * 4 * self.num_memory_arrays,
0.0)
else:
concat = linear([inputs, h],
self._num_units * 4 * self.num_memory_arrays,
True)
if self.use_layer_normalization:
concat = layer_norm(concat,
num_variables_in_tensor=4 *
self.num_memory_arrays)
# i = input_gate, j = new_input, f = forget_gate, o = output_gate
# -- comes in sets of fours
all_vars_list = tf.split(concat,
num_or_size_splits=4 *
self.num_memory_arrays,
axis=1)
## memory array loop
new_c_list, new_h_list = [], []
for array_counter in range(self.num_memory_arrays):
i = all_vars_list[0 + array_counter * 4]
j = all_vars_list[1 + array_counter * 4]
f = all_vars_list[2 + array_counter * 4]
o = all_vars_list[3 + array_counter * 4]
if self.use_recurrent_dropout and self.is_training:
input_contribution = tf.nn.dropout(
tf.tanh(j), self.recurrent_dropout_factor)
else:
input_contribution = tf.tanh(j)
new_c_list.append(c_list[array_counter] *
tf.sigmoid(f + self._forget_bias) +
tf.sigmoid(i) * input_contribution)
if self.use_layer_normalization:
new_c = layer_norm(new_c_list[-1])
else:
new_c = new_c_list[-1]
new_h_list.append(tf.tanh(new_c) * tf.sigmoid(o))
## sum all new_h components -- could instead do a mean -- but investigate that later
new_h = tf.add_n(new_h_list)
return new_h, tf.concat([new_h] + new_c_list,
axis=1) # purposely reversed