Source code for d3rlpy.algos.ddpg

from .base import AlgoBase
from .torch.ddpg_impl import DDPGImpl
from ..optimizers import AdamFactory
from ..argument_utils import check_encoder
from ..argument_utils import check_use_gpu
from ..argument_utils import check_q_func
from ..argument_utils import check_augmentation


[docs]class DDPG(AlgoBase): r""" Deep Deterministic Policy Gradients algorithm. DDPG is an actor-critic algorithm that trains a Q function parametrized with :math:`\theta` and a policy function parametrized with :math:`\phi`. .. math:: L(\theta) = \mathbb{E}_{s_t, a_t, r_{t+1}, s_{t+1} \sim D} [(r_{t+1} + \gamma Q_{\theta'}(s_{t+1}, \pi_{\phi'}(s_{t+1})) - Q_\theta(s_t, a_t))^2] .. math:: J(\phi) = \mathbb{E}_{s_t \sim D} [Q_\theta(s_t, \pi_\phi(s_t))] where :math:`\theta'` and :math:`\phi` are the target network parameters. There target network parameters are updated every iteration. .. math:: \theta' \gets \tau \theta + (1 - \tau) \theta' \phi' \gets \tau \phi + (1 - \tau) \phi' References: * `Silver et al., Deterministic policy gradient algorithms. <http://proceedings.mlr.press/v32/silver14.html>`_ * `Lillicrap et al., Continuous control with deep reinforcement learning. <https://arxiv.org/abs/1509.02971>`_ Args: actor_learning_rate (float): learning rate for policy function. critic_learning_rate (float): learning rate for Q function. actor_optim_factory (d3rlpy.optimizers.OptimizerFactory): optimizer factory for the actor. critic_optim_factory (d3rlpy.optimizers.OptimizerFactory): optimizer factory for the critic. actor_encoder_factory (d3rlpy.encoders.EncoderFactory or str): encoder factory for the actor. critic_encoder_factory (d3rlpy.encoders.EncoderFactory or str): encoder factory for the critic. q_func_factory (d3rlpy.q_functions.QFunctionFactory or str): Q function factory. batch_size (int): mini-batch size. n_frames (int): the number of frames to stack for image observation. n_steps (int): N-step TD calculation. gamma (float): discount factor. tau (float): target network synchronization coefficiency. n_critics (int): the number of Q functions for ensemble. bootstrap (bool): flag to bootstrap Q functions. share_encoder (bool): flag to share encoder network. reguralizing_rate (float): reguralizing term for policy function. use_gpu (bool, int or d3rlpy.gpu.Device): flag to use GPU, device ID or device. scaler (d3rlpy.preprocessing.Scaler or str): preprocessor. The available options are `['pixel', 'min_max', 'standard']` augmentation (d3rlpy.augmentation.AugmentationPipeline or list(str)): augmentation pipeline. dynamics (d3rlpy.dynamics.base.DynamicsBase): dynamics model for data augmentation. impl (d3rlpy.algos.torch.ddpg_impl.DDPGImpl): algorithm implementation. Attributes: actor_learning_rate (float): learning rate for policy function. critic_learning_rate (float): learning rate for Q function. actor_optim_factory (d3rlpy.optimizers.OptimizerFactory): optimizer factory for the actor. critic_optim_factory (d3rlpy.optimizers.OptimizerFactory): optimizer factory for the critic. actor_encoder_factory (d3rlpy.encoders.EncoderFactory): encoder factory for the actor. critic_encoder_factory (d3rlpy.encoders.EncoderFactory): encoder factory for the critic. q_func_factory (d3rlpy.q_functions.QFunctionFactory): Q function factory. batch_size (int): mini-batch size. n_frames (int): the number of frames to stack for image observation. n_steps (int): N-step TD calculation. gamma (float): discount factor. tau (float): target network synchronization coefficiency. n_critics (int): the number of Q functions for ensemble. bootstrap (bool): flag to bootstraep Q functions. share_encoder (bool): flag to share encoder network. reguralizing_rate (float): reguralizing term for policy function. use_gpu (d3rlpy.gpu.Device): GPU device. scaler (d3rlpy.preprocessing.Scaler): preprocessor. augmentation (d3rlpy.augmentation.AugmentationPipeline): augmentation pipeline. dynamics (d3rlpy.dynamics.base.DynamicsBase): dynamics model. impl (d3rlpy.algos.torch.ddpg_impl.DDPGImpl): algorithm implementation. eval_results_ (dict): evaluation results. """ def __init__(self, *, actor_learning_rate=3e-4, critic_learning_rate=3e-4, actor_optim_factory=AdamFactory(), critic_optim_factory=AdamFactory(), actor_encoder_factory='default', critic_encoder_factory='default', q_func_factory='mean', batch_size=100, n_frames=1, n_steps=1, gamma=0.99, tau=0.005, n_critics=1, bootstrap=False, share_encoder=False, reguralizing_rate=1e-10, use_gpu=False, scaler=None, augmentation=None, encoder_params={}, dynamics=None, impl=None, **kwargs): super().__init__(batch_size=batch_size, n_frames=n_frames, n_steps=n_steps, gamma=gamma, scaler=scaler, dynamics=dynamics) self.actor_learning_rate = actor_learning_rate self.critic_learning_rate = critic_learning_rate self.actor_optim_factory = actor_optim_factory self.critic_optim_factory = critic_optim_factory self.actor_encoder_factory = check_encoder(actor_encoder_factory) self.critic_encoder_factory = check_encoder(critic_encoder_factory) self.q_func_factory = check_q_func(q_func_factory) self.tau = tau self.n_critics = n_critics self.bootstrap = bootstrap self.share_encoder = share_encoder self.reguralizing_rate = reguralizing_rate self.augmentation = check_augmentation(augmentation) self.encoder_params = encoder_params self.use_gpu = check_use_gpu(use_gpu) self.impl = impl
[docs] def create_impl(self, observation_shape, action_size): self.impl = DDPGImpl( observation_shape=observation_shape, action_size=action_size, actor_learning_rate=self.actor_learning_rate, critic_learning_rate=self.critic_learning_rate, actor_optim_factory=self.actor_optim_factory, critic_optim_factory=self.critic_optim_factory, actor_encoder_factory=self.actor_encoder_factory, critic_encoder_factory=self.critic_encoder_factory, q_func_factory=self.q_func_factory, gamma=self.gamma, tau=self.tau, n_critics=self.n_critics, bootstrap=self.bootstrap, share_encoder=self.share_encoder, reguralizing_rate=self.reguralizing_rate, use_gpu=self.use_gpu, scaler=self.scaler, augmentation=self.augmentation) self.impl.build()
[docs] def update(self, epoch, itr, batch): critic_loss = self.impl.update_critic(batch.observations, batch.actions, batch.next_rewards, batch.next_observations, batch.terminals, batch.n_steps) actor_loss = self.impl.update_actor(batch.observations) self.impl.update_critic_target() self.impl.update_actor_target() return critic_loss, actor_loss
def _get_loss_labels(self): return ['critic_loss', 'actor_loss']