def create_sac_value_head(
self, stream_names, hidden_input, num_layers, h_size, scope
):
"""
Creates one value estimator head for each reward signal in stream_names.
Also creates the node corresponding to the mean of all the value heads in self.value.
self.value_head is a dictionary of stream name to node containing the value estimator head for that signal.
:param stream_names: The list of reward signal names
:param hidden_input: The last layer of the Critic. The heads will consist of one dense hidden layer on top
of the hidden input.
:param num_layers: Number of hidden layers for value network
:param h_size: size of hidden layers for value network
:param scope: TF scope for value network.
"""
with tf.variable_scope(scope):
value_hidden = ModelUtils.create_vector_observation_encoder(
hidden_input, h_size, self.activ_fn, num_layers, "encoder", False
)
if self.use_recurrent:
value_hidden, memory_out = ModelUtils.create_recurrent_encoder(
value_hidden,
self.value_memory_in,
self.sequence_length_ph,
name="lstm_value",
)
self.value_memory_out = memory_out
self.create_value_heads(stream_names, value_hidden)
def create_curiosity_encoders(self) -> Tuple[tf.Tensor, tf.Tensor]:
"""
Creates state encoders for current and future observations.
Used for implementation of Curiosity-driven Exploration by Self-supervised Prediction
See https://arxiv.org/abs/1705.05363 for more details.
:return: current and future state encoder tensors.
"""
encoded_state_list = []
encoded_next_state_list = []
# Create input ops for next (t+1) visual observations.
self.next_vector_in, self.next_visual_in = ModelUtils.create_input_placeholders(
self.policy.behavior_spec.observation_shapes,
name_prefix="curiosity_next_")
if self.next_visual_in:
visual_encoders = []
next_visual_encoders = []
for i, (vis_in, next_vis_in) in enumerate(
zip(self.policy.visual_in, self.next_visual_in)):
# Create the encoder ops for current and next visual input.
# Note that these encoders are siamese.
encoded_visual = ModelUtils.create_visual_observation_encoder(
vis_in,
self.encoding_size,
ModelUtils.swish,
1,
"curiosity_stream_{}_visual_obs_encoder".format(i),
False,
)
encoded_next_visual = ModelUtils.create_visual_observation_encoder(
next_vis_in,
self.encoding_size,
ModelUtils.swish,
1,
"curiosity_stream_{}_visual_obs_encoder".format(i),
True,
)
visual_encoders.append(encoded_visual)
next_visual_encoders.append(encoded_next_visual)
hidden_visual = tf.concat(visual_encoders, axis=1)
hidden_next_visual = tf.concat(next_visual_encoders, axis=1)
encoded_state_list.append(hidden_visual)
encoded_next_state_list.append(hidden_next_visual)
if self.policy.vec_obs_size > 0:
encoded_vector_obs = ModelUtils.create_vector_observation_encoder(
self.policy.vector_in,
self.encoding_size,
ModelUtils.swish,
2,
"curiosity_vector_obs_encoder",
False,
)
encoded_next_vector_obs = ModelUtils.create_vector_observation_encoder(
self.next_vector_in,
self.encoding_size,
ModelUtils.swish,
2,
"curiosity_vector_obs_encoder",
True,
)
encoded_state_list.append(encoded_vector_obs)
encoded_next_state_list.append(encoded_next_vector_obs)
encoded_state = tf.concat(encoded_state_list, axis=1)
encoded_next_state = tf.concat(encoded_next_state_list, axis=1)
return encoded_state, encoded_next_state
def create_q_heads(
self,
stream_names,
hidden_input,
num_layers,
h_size,
scope,
reuse=False,
num_outputs=1,
):
"""
Creates two q heads for each reward signal in stream_names.
Also creates the node corresponding to the mean of all the value heads in self.value.
self.value_head is a dictionary of stream name to node containing the value estimator head for that signal.
:param stream_names: The list of reward signal names
:param hidden_input: The last layer of the Critic. The heads will consist of one dense hidden layer on top
of the hidden input.
:param num_layers: Number of hidden layers for Q network
:param h_size: size of hidden layers for Q network
:param scope: TF scope for Q network.
:param reuse: Whether or not to reuse variables. Useful for creating Q of policy.
:param num_outputs: Number of outputs of each Q function. If discrete, equal to number of actions.
"""
with tf.variable_scope(self.join_scopes(scope, "q1_encoding"), reuse=reuse):
q1_hidden = ModelUtils.create_vector_observation_encoder(
hidden_input, h_size, self.activ_fn, num_layers, "q1_encoder", reuse
)
if self.use_recurrent:
q1_hidden, memory_out = ModelUtils.create_recurrent_encoder(
q1_hidden,
self.q1_memory_in,
self.sequence_length_ph,
name="lstm_q1",
)
self.q1_memory_out = memory_out
q1_heads = {}
for name in stream_names:
_q1 = tf.layers.dense(q1_hidden, num_outputs, name="{}_q1".format(name))
q1_heads[name] = _q1
q1 = tf.reduce_mean(list(q1_heads.values()), axis=0)
with tf.variable_scope(self.join_scopes(scope, "q2_encoding"), reuse=reuse):
q2_hidden = ModelUtils.create_vector_observation_encoder(
hidden_input, h_size, self.activ_fn, num_layers, "q2_encoder", reuse
)
if self.use_recurrent:
q2_hidden, memory_out = ModelUtils.create_recurrent_encoder(
q2_hidden,
self.q2_memory_in,
self.sequence_length_ph,
name="lstm_q2",
)
self.q2_memory_out = memory_out
q2_heads = {}
for name in stream_names:
_q2 = tf.layers.dense(q2_hidden, num_outputs, name="{}_q2".format(name))
q2_heads[name] = _q2
q2 = tf.reduce_mean(list(q2_heads.values()), axis=0)
return q1_heads, q2_heads, q1, q2
def create_curiosity_encoders(self) -> Tuple[tf.Tensor, tf.Tensor]:
"""
Creates state encoders for current and future observations.
Used for implementation of Curiosity-driven Exploration by Self-supervised Prediction
See https://arxiv.org/abs/1705.05363 for more details.
:return: current and future state encoder tensors.
"""
encoded_state_list = []
encoded_next_state_list = []
if self.policy.vis_obs_size > 0:
self.next_visual_in = []
visual_encoders = []
next_visual_encoders = []
for i in range(self.policy.vis_obs_size):
# Create input ops for next (t+1) visual observations.
next_visual_input = ModelUtils.create_visual_input(
self.policy.brain.camera_resolutions[i],
name="curiosity_next_visual_observation_" + str(i),
)
self.next_visual_in.append(next_visual_input)
# Create the encoder ops for current and next visual input.
# Note that these encoders are siamese.
encoded_visual = ModelUtils.create_visual_observation_encoder(
self.policy.visual_in[i],
self.encoding_size,
ModelUtils.swish,
1,
"curiosity_stream_{}_visual_obs_encoder".format(i),
False,
)
encoded_next_visual = ModelUtils.create_visual_observation_encoder(
self.next_visual_in[i],
self.encoding_size,
ModelUtils.swish,
1,
"curiosity_stream_{}_visual_obs_encoder".format(i),
True,
)
visual_encoders.append(encoded_visual)
next_visual_encoders.append(encoded_next_visual)
hidden_visual = tf.concat(visual_encoders, axis=1)
hidden_next_visual = tf.concat(next_visual_encoders, axis=1)
encoded_state_list.append(hidden_visual)
encoded_next_state_list.append(hidden_next_visual)
if self.policy.vec_obs_size > 0:
# Create the encoder ops for current and next vector input.
# Note that these encoders are siamese.
# Create input op for next (t+1) vector observation.
self.next_vector_in = tf.placeholder(
shape=[None, self.policy.vec_obs_size],
dtype=tf.float32,
name="curiosity_next_vector_observation",
)
encoded_vector_obs = ModelUtils.create_vector_observation_encoder(
self.policy.vector_in,
self.encoding_size,
ModelUtils.swish,
2,
"curiosity_vector_obs_encoder",
False,
)
encoded_next_vector_obs = ModelUtils.create_vector_observation_encoder(
self.next_vector_in,
self.encoding_size,
ModelUtils.swish,
2,
"curiosity_vector_obs_encoder",
True,
)
encoded_state_list.append(encoded_vector_obs)
encoded_next_state_list.append(encoded_next_vector_obs)
encoded_state = tf.concat(encoded_state_list, axis=1)
encoded_next_state = tf.concat(encoded_next_state_list, axis=1)
return encoded_state, encoded_next_state
