def make_inputs(self) -> None:
"""
Creates the input layers for the discriminator
"""
self.done_expert_holder = tf.placeholder(shape=[None], dtype=tf.float32)
self.done_policy_holder = tf.placeholder(shape=[None], dtype=tf.float32)
self.done_expert = tf.expand_dims(self.done_expert_holder, -1)
self.done_policy = tf.expand_dims(self.done_policy_holder, -1)
if self.policy.behavior_spec.is_action_continuous():
action_length = self.policy.act_size[0]
self.action_in_expert = tf.placeholder(
shape=[None, action_length], dtype=tf.float32
)
self.expert_action = tf.identity(self.action_in_expert)
else:
action_length = len(self.policy.act_size)
self.action_in_expert = tf.placeholder(
shape=[None, action_length], dtype=tf.int32
)
self.expert_action = tf.concat(
[
tf.one_hot(self.action_in_expert[:, i], act_size)
for i, act_size in enumerate(self.policy.act_size)
],
axis=1,
)
encoded_policy_list = []
encoded_expert_list = []
(
self.obs_in_expert,
self.expert_visual_in,
) = ModelUtils.create_input_placeholders(
self.policy.behavior_spec.observation_shapes, "gail_"
)
if self.policy.vec_obs_size > 0:
if self.policy.normalize:
encoded_expert_list.append(
ModelUtils.normalize_vector_obs(
self.obs_in_expert,
self.policy.running_mean,
self.policy.running_variance,
self.policy.normalization_steps,
)
)
encoded_policy_list.append(self.policy.processed_vector_in)
else:
encoded_expert_list.append(self.obs_in_expert)
encoded_policy_list.append(self.policy.vector_in)
if self.expert_visual_in:
visual_policy_encoders = []
visual_expert_encoders = []
for i, (vis_in, exp_vis_in) in enumerate(
zip(self.policy.visual_in, self.expert_visual_in)
):
encoded_policy_visual = ModelUtils.create_visual_observation_encoder(
vis_in,
self.encoding_size,
ModelUtils.swish,
1,
f"gail_stream_{i}_visual_obs_encoder",
False,
)
encoded_expert_visual = ModelUtils.create_visual_observation_encoder(
exp_vis_in,
self.encoding_size,
ModelUtils.swish,
1,
f"gail_stream_{i}_visual_obs_encoder",
True,
)
visual_policy_encoders.append(encoded_policy_visual)
visual_expert_encoders.append(encoded_expert_visual)
hidden_policy_visual = tf.concat(visual_policy_encoders, axis=1)
hidden_expert_visual = tf.concat(visual_expert_encoders, axis=1)
encoded_policy_list.append(hidden_policy_visual)
encoded_expert_list.append(hidden_expert_visual)
self.encoded_expert = tf.concat(encoded_expert_list, axis=1)
self.encoded_policy = tf.concat(encoded_policy_list, axis=1)
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,
f"curiosity_stream_{i}_visual_obs_encoder",
False,
)
encoded_next_visual = ModelUtils.create_visual_observation_encoder(
next_vis_in,
self.encoding_size,
ModelUtils.swish,
1,
f"curiosity_stream_{i}_visual_obs_encoder",
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