ca69e79b4a
* Remove flag `eval_mode` from Collector.collect
* Replace flag `is_eval` in BasePolicy with `is_within_training_step` (negating usages)
and set it appropriately in BaseTrainer
290 lines
10 KiB
Python
290 lines
10 KiB
Python
import argparse
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import os
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import warnings
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from typing import Any
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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 pettingzoo.butterfly import pistonball_v6
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from torch import nn
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from torch.distributions import Distribution, Independent, Normal
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from torch.utils.tensorboard import SummaryWriter
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from tianshou.data import Collector, VectorReplayBuffer
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from tianshou.data.stats import InfoStats
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from tianshou.env import DummyVectorEnv
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from tianshou.env.pettingzoo_env import PettingZooEnv
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from tianshou.policy import BasePolicy, MultiAgentPolicyManager, PPOPolicy
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from tianshou.trainer import OnpolicyTrainer
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from tianshou.utils import TensorboardLogger
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from tianshou.utils.net.continuous import ActorProb, Critic
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class DQN(nn.Module):
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"""Reference: Human-level control through deep reinforcement learning.
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For advanced usage (how to customize the network), please refer to
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:ref:`build_the_network`.
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"""
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def __init__(
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self,
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c: int,
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h: int,
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w: int,
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device: str | int | torch.device = "cpu",
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) -> None:
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super().__init__()
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self.device = device
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self.c = c
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self.h = h
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self.w = w
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self.net = nn.Sequential(
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nn.Conv2d(c, 32, kernel_size=8, stride=4),
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nn.ReLU(inplace=True),
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nn.Conv2d(32, 64, kernel_size=4, stride=2),
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nn.ReLU(inplace=True),
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nn.Conv2d(64, 64, kernel_size=3, stride=1),
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nn.ReLU(inplace=True),
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nn.Flatten(),
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)
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with torch.no_grad():
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self.output_dim = np.prod(self.net(torch.zeros(1, c, h, w)).shape[1:])
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def forward(
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self,
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x: np.ndarray | torch.Tensor,
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state: Any | None = None,
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info: dict[str, Any] | None = None,
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) -> tuple[torch.Tensor, Any]:
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r"""Mapping: x -> Q(x, \*)."""
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if info is None:
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info = {}
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x = torch.as_tensor(x, device=self.device, dtype=torch.float32)
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return self.net(x.reshape(-1, self.c, self.w, self.h)), state
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def get_parser() -> argparse.ArgumentParser:
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parser = argparse.ArgumentParser()
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parser.add_argument("--seed", type=int, default=1626)
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parser.add_argument("--eps-test", type=float, default=0.05)
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parser.add_argument("--eps-train", type=float, default=0.1)
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parser.add_argument("--buffer-size", type=int, default=2000)
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parser.add_argument("--lr", type=float, default=1e-3)
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parser.add_argument(
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"--gamma",
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type=float,
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default=0.9,
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help="a smaller gamma favors earlier win",
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)
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parser.add_argument(
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"--n-pistons",
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type=int,
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default=3,
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help="Number of pistons(agents) in the env",
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)
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parser.add_argument("--n-step", type=int, default=100)
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parser.add_argument("--target-update-freq", type=int, default=320)
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parser.add_argument("--epoch", type=int, default=5)
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parser.add_argument("--step-per-epoch", type=int, default=500)
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parser.add_argument("--step-per-collect", type=int, default=10)
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parser.add_argument("--episode-per-collect", type=int, default=16)
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parser.add_argument("--repeat-per-collect", type=int, default=2)
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parser.add_argument("--update-per-step", type=float, default=0.1)
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parser.add_argument("--batch-size", type=int, default=32)
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parser.add_argument("--hidden-sizes", type=int, nargs="*", default=[64, 64])
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parser.add_argument("--training-num", type=int, default=10)
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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(
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"--watch",
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default=False,
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action="store_true",
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help="no training, watch the play of pre-trained models",
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)
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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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# ppo special
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parser.add_argument("--vf-coef", type=float, default=0.25)
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parser.add_argument("--ent-coef", type=float, default=0.0)
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parser.add_argument("--eps-clip", type=float, default=0.2)
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parser.add_argument("--max-grad-norm", type=float, default=0.5)
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parser.add_argument("--gae-lambda", type=float, default=0.95)
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parser.add_argument("--rew-norm", type=int, default=1)
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parser.add_argument("--dual-clip", type=float, default=None)
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parser.add_argument("--value-clip", type=int, default=1)
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parser.add_argument("--norm-adv", type=int, default=1)
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parser.add_argument("--recompute-adv", type=int, default=0)
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parser.add_argument("--resume", action="store_true")
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parser.add_argument("--save-interval", type=int, default=4)
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parser.add_argument("--render", type=float, default=0.0)
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return parser
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def get_args() -> argparse.Namespace:
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parser = get_parser()
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return parser.parse_known_args()[0]
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def get_env(args: argparse.Namespace = get_args()) -> PettingZooEnv:
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return PettingZooEnv(pistonball_v6.env(continuous=True, n_pistons=args.n_pistons))
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def get_agents(
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args: argparse.Namespace = get_args(),
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agents: list[BasePolicy] | None = None,
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optims: list[torch.optim.Optimizer] | None = None,
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) -> tuple[BasePolicy, list[torch.optim.Optimizer] | None, list]:
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env = get_env()
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observation_space = (
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env.observation_space["observation"]
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if isinstance(env.observation_space, gym.spaces.Dict)
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else env.observation_space
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)
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args.state_shape = observation_space.shape or observation_space.n
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args.action_shape = env.action_space.shape or env.action_space.n
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args.max_action = env.action_space.high[0]
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if agents is None:
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agents = []
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optims = []
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for _ in range(args.n_pistons):
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# model
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net = DQN(
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observation_space.shape[2],
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observation_space.shape[1],
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observation_space.shape[0],
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device=args.device,
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).to(args.device)
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actor = ActorProb(
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net,
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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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net2 = DQN(
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observation_space.shape[2],
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observation_space.shape[1],
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observation_space.shape[0],
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device=args.device,
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).to(args.device)
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critic = Critic(net2, device=args.device).to(args.device)
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for m in set(actor.modules()).union(critic.modules()):
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if isinstance(m, torch.nn.Linear):
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torch.nn.init.orthogonal_(m.weight)
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torch.nn.init.zeros_(m.bias)
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optim = torch.optim.Adam(set(actor.parameters()).union(critic.parameters()), lr=args.lr)
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def dist(loc_scale: tuple[torch.Tensor, torch.Tensor]) -> Distribution:
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loc, scale = loc_scale
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return Independent(Normal(loc, scale), 1)
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agent: PPOPolicy = PPOPolicy(
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actor=actor,
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critic=critic,
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optim=optim,
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dist_fn=dist,
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discount_factor=args.gamma,
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max_grad_norm=args.max_grad_norm,
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eps_clip=args.eps_clip,
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vf_coef=args.vf_coef,
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ent_coef=args.ent_coef,
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reward_normalization=args.rew_norm,
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advantage_normalization=args.norm_adv,
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recompute_advantage=args.recompute_adv,
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# dual_clip=args.dual_clip,
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# dual clip cause monotonically increasing log_std :)
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value_clip=args.value_clip,
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gae_lambda=args.gae_lambda,
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action_space=env.action_space,
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)
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agents.append(agent)
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optims.append(optim)
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policy = MultiAgentPolicyManager(
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policies=agents,
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env=env,
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action_scaling=True,
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action_bound_method="clip",
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)
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return policy, optims, env.agents
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def train_agent(
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args: argparse.Namespace = get_args(),
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agents: list[BasePolicy] | None = None,
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optims: list[torch.optim.Optimizer] | None = None,
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) -> tuple[InfoStats, BasePolicy]:
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train_envs = DummyVectorEnv([get_env for _ in range(args.training_num)])
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test_envs = DummyVectorEnv([get_env for _ in range(args.test_num)])
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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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train_envs.seed(args.seed)
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test_envs.seed(args.seed)
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policy, optim, agents = get_agents(args, agents=agents, optims=optims)
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# collector
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train_collector = Collector(
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policy,
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train_envs,
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VectorReplayBuffer(args.buffer_size, len(train_envs)),
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exploration_noise=False, # True
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)
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test_collector = Collector(policy, test_envs)
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# train_collector.collect(n_step=args.batch_size * args.training_num, reset_before_collect=True)
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# log
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log_path = os.path.join(args.logdir, "pistonball", "dqn")
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writer = SummaryWriter(log_path)
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writer.add_text("args", str(args))
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logger = TensorboardLogger(writer)
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def save_best_fn(policy: BasePolicy) -> None:
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pass
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def stop_fn(mean_rewards: float) -> bool:
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return False
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def reward_metric(rews: np.ndarray) -> np.ndarray:
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return rews[:, 0]
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# trainer
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result = OnpolicyTrainer(
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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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repeat_per_collect=args.repeat_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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episode_per_collect=args.episode_per_collect,
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stop_fn=stop_fn,
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save_best_fn=save_best_fn,
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logger=logger,
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resume_from_log=args.resume,
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).run()
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return result, policy
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def watch(args: argparse.Namespace = get_args(), policy: BasePolicy | None = None) -> None:
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env = DummyVectorEnv([get_env])
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if not policy:
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warnings.warn(
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"watching random agents, as loading pre-trained policies is currently not supported",
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)
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policy, _, _ = get_agents(args)
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collector = Collector(policy, env)
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collector_result = collector.collect(n_episode=1, render=args.render)
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collector_result.pprint_asdict()
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