60d1ba1c8f
Needed due to a breaking change in the Collector which was overlooked in some of the examples
250 lines
9.1 KiB
Python
250 lines
9.1 KiB
Python
#!/usr/bin/env python3
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# isort: skip_file
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import argparse
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import datetime
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import os
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import pprint
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import gymnasium as gym
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import numpy as np
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import torch
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from tianshou.data import (
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Collector,
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HERReplayBuffer,
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HERVectorReplayBuffer,
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ReplayBuffer,
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VectorReplayBuffer,
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)
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from tianshou.highlevel.logger import LoggerFactoryDefault
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from tianshou.env import ShmemVectorEnv, TruncatedAsTerminated
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from tianshou.exploration import GaussianNoise
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from tianshou.policy import DDPGPolicy
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from tianshou.policy.base import BasePolicy
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from tianshou.trainer import OffpolicyTrainer
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from tianshou.utils.net.common import Net, get_dict_state_decorator
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from tianshou.utils.net.continuous import Actor, Critic
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from tianshou.env.venvs import BaseVectorEnv
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from tianshou.utils.space_info import ActionSpaceInfo
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def get_args() -> argparse.Namespace:
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parser = argparse.ArgumentParser()
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parser.add_argument("--task", type=str, default="FetchReach-v2")
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parser.add_argument("--seed", type=int, default=0)
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parser.add_argument("--buffer-size", type=int, default=100000)
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parser.add_argument("--hidden-sizes", type=int, nargs="*", default=[256, 256])
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parser.add_argument("--actor-lr", type=float, default=1e-3)
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parser.add_argument("--critic-lr", type=float, default=3e-3)
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parser.add_argument("--gamma", type=float, default=0.99)
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parser.add_argument("--tau", type=float, default=0.005)
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parser.add_argument("--exploration-noise", type=float, default=0.1)
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parser.add_argument("--start-timesteps", type=int, default=25000)
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parser.add_argument("--epoch", type=int, default=10)
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parser.add_argument("--step-per-epoch", type=int, default=5000)
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parser.add_argument("--step-per-collect", type=int, default=1)
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parser.add_argument("--update-per-step", type=int, default=1)
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parser.add_argument("--n-step", type=int, default=1)
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parser.add_argument("--batch-size", type=int, default=512)
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parser.add_argument("--replay-buffer", type=str, default="her", choices=["normal", "her"])
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parser.add_argument("--her-horizon", type=int, default=50)
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parser.add_argument("--her-future-k", type=int, default=8)
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parser.add_argument("--training-num", type=int, default=1)
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parser.add_argument("--test-num", type=int, default=10)
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parser.add_argument("--logdir", type=str, default="log")
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parser.add_argument("--render", type=float, default=0.0)
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parser.add_argument(
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"--device",
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type=str,
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default="cuda" if torch.cuda.is_available() else "cpu",
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)
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parser.add_argument("--resume-path", type=str, default=None)
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parser.add_argument("--resume-id", type=str, default=None)
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parser.add_argument(
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"--logger",
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type=str,
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default="tensorboard",
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choices=["tensorboard", "wandb"],
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)
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parser.add_argument("--wandb-project", type=str, default="HER-benchmark")
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parser.add_argument(
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"--watch",
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default=False,
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action="store_true",
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help="watch the play of pre-trained policy only",
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)
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return parser.parse_args()
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def make_fetch_env(
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task: str,
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training_num: int,
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test_num: int,
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) -> tuple[gym.Env, BaseVectorEnv, BaseVectorEnv]:
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env = TruncatedAsTerminated(gym.make(task))
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train_envs = ShmemVectorEnv(
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[lambda: TruncatedAsTerminated(gym.make(task)) for _ in range(training_num)],
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)
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test_envs = ShmemVectorEnv(
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[lambda: TruncatedAsTerminated(gym.make(task)) for _ in range(test_num)],
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)
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return env, train_envs, test_envs
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def test_ddpg(args: argparse.Namespace = get_args()) -> None:
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# log
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now = datetime.datetime.now().strftime("%y%m%d-%H%M%S")
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args.algo_name = "ddpg"
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log_name = os.path.join(args.task, args.algo_name, str(args.seed), now)
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log_path = os.path.join(args.logdir, log_name)
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# logger
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logger_factory = LoggerFactoryDefault()
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if args.logger == "wandb":
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logger_factory.logger_type = "wandb"
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logger_factory.wandb_project = args.wandb_project
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else:
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logger_factory.logger_type = "tensorboard"
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logger = logger_factory.create_logger(
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log_dir=log_path,
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experiment_name=log_name,
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run_id=args.resume_id,
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config_dict=vars(args),
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)
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env, train_envs, test_envs = make_fetch_env(args.task, args.training_num, args.test_num)
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# The method HER works with goal-based environments
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if not isinstance(env.observation_space, gym.spaces.Dict):
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raise ValueError(
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"`env.observation_space` must be of type `gym.spaces.Dict`. Make sure you're using a goal-based environment like `FetchReach-v2`.",
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)
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if not hasattr(env, "compute_reward"):
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raise ValueError(
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"Atrribute `compute_reward` not found in `env`. "
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"HER-based algorithms typically require this attribute. Make sure you're using a goal-based environment like `FetchReach-v2`.",
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)
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args.state_shape = {
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"observation": env.observation_space["observation"].shape,
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"achieved_goal": env.observation_space["achieved_goal"].shape,
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"desired_goal": env.observation_space["desired_goal"].shape,
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}
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action_info = ActionSpaceInfo.from_space(env.action_space)
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args.action_shape = action_info.action_shape
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args.max_action = action_info.max_action
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args.exploration_noise = args.exploration_noise * args.max_action
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print("Observations shape:", args.state_shape)
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print("Actions shape:", args.action_shape)
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print("Action range:", action_info.min_action, action_info.max_action)
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# seed
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np.random.seed(args.seed)
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torch.manual_seed(args.seed)
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# model
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dict_state_dec, flat_state_shape = get_dict_state_decorator(
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state_shape=args.state_shape,
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keys=["observation", "achieved_goal", "desired_goal"],
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)
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net_a = dict_state_dec(Net)(
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flat_state_shape,
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hidden_sizes=args.hidden_sizes,
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device=args.device,
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)
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actor = dict_state_dec(Actor)(
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net_a,
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args.action_shape,
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max_action=args.max_action,
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device=args.device,
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).to(args.device)
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actor_optim = torch.optim.Adam(actor.parameters(), lr=args.actor_lr)
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net_c = dict_state_dec(Net)(
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flat_state_shape,
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action_shape=args.action_shape,
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hidden_sizes=args.hidden_sizes,
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concat=True,
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device=args.device,
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)
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critic = dict_state_dec(Critic)(net_c, device=args.device).to(args.device)
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critic_optim = torch.optim.Adam(critic.parameters(), lr=args.critic_lr)
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policy: DDPGPolicy = DDPGPolicy(
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actor=actor,
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actor_optim=actor_optim,
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critic=critic,
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critic_optim=critic_optim,
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tau=args.tau,
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gamma=args.gamma,
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exploration_noise=GaussianNoise(sigma=args.exploration_noise),
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estimation_step=args.n_step,
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action_space=env.action_space,
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)
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# load a previous policy
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if args.resume_path:
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policy.load_state_dict(torch.load(args.resume_path, map_location=args.device))
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print("Loaded agent from: ", args.resume_path)
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# collector
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def compute_reward_fn(ag: np.ndarray, g: np.ndarray) -> np.ndarray:
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return env.compute_reward(ag, g, {})
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buffer: VectorReplayBuffer | ReplayBuffer | HERReplayBuffer | HERVectorReplayBuffer
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if args.replay_buffer == "normal":
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if args.training_num > 1:
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buffer = VectorReplayBuffer(args.buffer_size, len(train_envs))
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else:
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buffer = ReplayBuffer(args.buffer_size)
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else:
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if args.training_num > 1:
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buffer = HERVectorReplayBuffer(
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args.buffer_size,
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len(train_envs),
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compute_reward_fn=compute_reward_fn,
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horizon=args.her_horizon,
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future_k=args.her_future_k,
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)
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else:
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buffer = HERReplayBuffer(
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args.buffer_size,
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compute_reward_fn=compute_reward_fn,
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horizon=args.her_horizon,
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future_k=args.her_future_k,
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)
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train_collector = Collector(policy, train_envs, buffer, exploration_noise=True)
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test_collector = Collector(policy, test_envs)
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train_collector.reset()
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train_collector.collect(n_step=args.start_timesteps, random=True)
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def save_best_fn(policy: BasePolicy) -> None:
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torch.save(policy.state_dict(), os.path.join(log_path, "policy.pth"))
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if not args.watch:
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# trainer
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result = OffpolicyTrainer(
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policy=policy,
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train_collector=train_collector,
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test_collector=test_collector,
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max_epoch=args.epoch,
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step_per_epoch=args.step_per_epoch,
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step_per_collect=args.step_per_collect,
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episode_per_test=args.test_num,
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batch_size=args.batch_size,
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save_best_fn=save_best_fn,
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logger=logger,
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update_per_step=args.update_per_step,
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test_in_train=False,
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).run()
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pprint.pprint(result)
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# Let's watch its performance!
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policy.eval()
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test_envs.seed(args.seed)
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test_collector.reset()
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collector_stats = test_collector.collect(n_episode=args.test_num, render=args.render)
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collector_stats.pprint_asdict()
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if __name__ == "__main__":
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test_ddpg()
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