# pylint: disable=wildcard-import, unused-wildcard-import
from .ddpg import *
[docs]class HDDPG(DDPG):
"""
HDDPG framework.
"""
def __init__(self,
actor: Union[NeuralNetworkModule, nn.Module],
actor_target: Union[NeuralNetworkModule, nn.Module],
critic: Union[NeuralNetworkModule, nn.Module],
critic_target: Union[NeuralNetworkModule, nn.Module],
optimizer: Callable,
criterion: Callable,
*_,
lr_scheduler: Callable = None,
lr_scheduler_args: Tuple[Tuple, Tuple] = None,
lr_scheduler_kwargs: Tuple[Dict, Dict] = None,
batch_size: int = 100,
update_rate: float = 0.005,
actor_learning_rate: float = 0.0005,
critic_learning_rate: float = 0.001,
discount: float = 0.99,
gradient_max: float = np.inf,
q_increase_rate: float = 1.0,
q_decrease_rate: float = 1.0,
replay_size: int = 500000,
replay_device: Union[str, t.device] = "cpu",
replay_buffer: Buffer = None,
visualize: bool = False,
visualize_dir: str = "",
**__):
"""
See Also:
:class:`.DDPG`
Args:
actor: Actor network module.
actor_target: Target actor network module.
critic: Critic network module.
critic_target: Target critic network module.
optimizer: Optimizer used to optimize ``actor`` and ``critic``.
criterion: Criterion used to evaluate the value loss.
lr_scheduler: Learning rate scheduler of ``optimizer``.
lr_scheduler_args: Arguments of the learning rate scheduler.
lr_scheduler_kwargs: Keyword arguments of the learning
rate scheduler.
batch_size: Batch size used during training.
update_rate: :math:`\\tau` used to update target networks.
Target parameters are updated as:
:math:`\\theta_t = \\theta * \\tau + \\theta_t * (1 - \\tau)`
actor_learning_rate: Learning rate of the actor optimizer,
not compatible with ``lr_scheduler``.
critic_learning_rate: Learning rate of the critic optimizer,
not compatible with ``lr_scheduler``.
discount: :math:`\\gamma` used in the bellman function.
replay_size: Replay buffer size. Not compatible with
``replay_buffer``.
replay_device: Device where the replay buffer locates on, Not
compatible with ``replay_buffer``.
replay_buffer: Custom replay buffer.
visualize: Whether visualize the network flow in the first pass.
visualize_dir: Visualized graph save directory.
"""
super(HDDPG, self).__init__(actor, actor_target, critic, critic_target,
optimizer, criterion,
lr_scheduler=lr_scheduler,
lr_scheduler_args=lr_scheduler_args,
lr_scheduler_kwargs=lr_scheduler_kwargs,
batch_size=batch_size,
update_rate=update_rate,
actor_learning_rate=actor_learning_rate,
critic_learning_rate=critic_learning_rate,
discount=discount,
gradient_max=gradient_max,
replay_size=replay_size,
replay_device=replay_device,
replay_buffer=replay_buffer,
visualize=visualize,
visualize_dir=visualize_dir)
self.q_increase_rate = q_increase_rate
self.q_decrease_rate = q_decrease_rate
[docs] def update(self,
update_value=True,
update_policy=True,
update_target=True,
concatenate_samples=True,
**__):
# DOC INHERITED
self.actor.train()
self.critic.train()
batch_size, (state, action, reward, next_state, terminal, others) = \
self.replay_buffer.sample_batch(self.batch_size,
concatenate_samples,
sample_method="random_unique",
sample_attrs=[
"state", "action",
"reward", "next_state",
"terminal", "*"
])
# Update critic network first.
# Generate value reference :math: `y_i` using target actor and
# target critic.
with t.no_grad():
next_action = self.action_transform_function(
self._act(next_state, True), next_state, others
)
next_value = self._criticize(next_state, next_action, True)
next_value = next_value.view(batch_size, -1)
y_i = self.reward_function(
reward, self.discount, next_value, terminal, others
)
cur_value = self._criticize(state, action)
value_diff = y_i.to(cur_value.device) - cur_value
value_change = t.where(value_diff > 0,
value_diff * self.q_increase_rate,
value_diff * self.q_decrease_rate)
value_loss = self.criterion(cur_value,
(cur_value + value_change).detach())
if self.visualize:
self.visualize_model(value_loss, "critic", self.visualize_dir)
if update_value:
self.critic.zero_grad()
value_loss.backward()
nn.utils.clip_grad_norm_(
self.critic.parameters(), self.grad_max
)
self.critic_optim.step()
# Update actor network
cur_action = self.action_transform_function(
self._act(state), state, others
)
act_value = self._criticize(state, cur_action)
# "-" is applied because we want to maximize J_b(u),
# but optimizer workers by minimizing the target
act_policy_loss = -act_value.mean()
if self.visualize:
self.visualize_model(act_policy_loss, "actor", self.visualize_dir)
if update_policy:
self.actor.zero_grad()
act_policy_loss.backward()
nn.utils.clip_grad_norm_(
self.actor.parameters(), self.grad_max
)
self.actor_optim.step()
# Update target networks
if update_target:
soft_update(self.actor_target, self.actor, self.update_rate)
soft_update(self.critic_target, self.critic, self.update_rate)
self.actor.eval()
self.critic.eval()
# use .item() to prevent memory leakage
return -act_policy_loss.item(), value_loss.item()