150d0ec51b
This is the third PR of 6 commits mentioned in #274, which features refactor of Collector to fix #245. You can check #274 for more detail. Things changed in this PR: 1. refactor collector to be more cleaner, split AsyncCollector to support asyncvenv; 2. change buffer.add api to add(batch, bffer_ids); add several types of buffer (VectorReplayBuffer, PrioritizedVectorReplayBuffer, etc.) 3. add policy.exploration_noise(act, batch) -> act 4. small change in BasePolicy.compute_*_returns 5. move reward_metric from collector to trainer 6. fix np.asanyarray issue (different version's numpy will result in different output) 7. flake8 maxlength=88 8. polish docs and fix test Co-authored-by: n+e <trinkle23897@gmail.com>
122 lines
4.8 KiB
Python
122 lines
4.8 KiB
Python
import os
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import gym
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import torch
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import pprint
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import argparse
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import numpy as np
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from torch.utils.tensorboard import SummaryWriter
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from tianshou.policy import DQNPolicy
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from tianshou.utils.net.common import Net
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from tianshou.trainer import offpolicy_trainer
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from tianshou.data import Collector, VectorReplayBuffer
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from tianshou.env import DummyVectorEnv, SubprocVectorEnv
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def get_args():
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parser = argparse.ArgumentParser()
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# the parameters are found by Optuna
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parser.add_argument('--task', type=str, default='LunarLander-v2')
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parser.add_argument('--seed', type=int, default=0)
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parser.add_argument('--eps-test', type=float, default=0.01)
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parser.add_argument('--eps-train', type=float, default=0.73)
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parser.add_argument('--buffer-size', type=int, default=100000)
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parser.add_argument('--lr', type=float, default=0.013)
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parser.add_argument('--gamma', type=float, default=0.99)
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parser.add_argument('--n-step', type=int, default=4)
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parser.add_argument('--target-update-freq', type=int, default=500)
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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('--collect-per-step', type=int, default=16)
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parser.add_argument('--batch-size', type=int, default=128)
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parser.add_argument('--hidden-sizes', type=int,
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nargs='*', default=[128, 128])
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parser.add_argument('--dueling-q-hidden-sizes', type=int,
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nargs='*', default=[128, 128])
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parser.add_argument('--dueling-v-hidden-sizes', type=int,
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nargs='*', default=[128, 128])
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parser.add_argument('--training-num', type=int, default=16)
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parser.add_argument('--test-num', type=int, default=100)
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parser.add_argument('--logdir', type=str, default='log')
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parser.add_argument('--render', type=float, default=0.)
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parser.add_argument(
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'--device', type=str,
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default='cuda' if torch.cuda.is_available() else 'cpu')
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return parser.parse_args()
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def test_dqn(args=get_args()):
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env = gym.make(args.task)
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args.state_shape = env.observation_space.shape or env.observation_space.n
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args.action_shape = env.action_space.shape or env.action_space.n
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# train_envs = gym.make(args.task)
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# you can also use tianshou.env.SubprocVectorEnv
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train_envs = DummyVectorEnv(
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[lambda: gym.make(args.task) for _ in range(args.training_num)])
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# test_envs = gym.make(args.task)
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test_envs = SubprocVectorEnv(
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[lambda: gym.make(args.task) 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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# model
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Q_param = {"hidden_sizes": args.dueling_q_hidden_sizes}
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V_param = {"hidden_sizes": args.dueling_v_hidden_sizes}
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net = Net(args.state_shape, args.action_shape,
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hidden_sizes=args.hidden_sizes, device=args.device,
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dueling_param=(Q_param, V_param)).to(args.device)
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optim = torch.optim.Adam(net.parameters(), lr=args.lr)
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policy = DQNPolicy(
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net, optim, args.gamma, args.n_step,
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target_update_freq=args.target_update_freq)
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# collector
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train_collector = Collector(
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policy, train_envs,
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VectorReplayBuffer(args.buffer_size, len(train_envs)),
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exploration_noise=True)
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test_collector = Collector(policy, test_envs, exploration_noise=True)
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# policy.set_eps(1)
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train_collector.collect(n_step=args.batch_size * args.training_num)
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# log
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log_path = os.path.join(args.logdir, args.task, 'dqn')
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writer = SummaryWriter(log_path)
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def save_fn(policy):
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torch.save(policy.state_dict(), os.path.join(log_path, 'policy.pth'))
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def stop_fn(mean_rewards):
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return mean_rewards >= env.spec.reward_threshold
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def train_fn(epoch, env_step): # exp decay
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eps = max(args.eps_train * (1 - 5e-6) ** env_step, args.eps_test)
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policy.set_eps(eps)
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def test_fn(epoch, env_step):
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policy.set_eps(args.eps_test)
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# trainer
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result = offpolicy_trainer(
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policy, train_collector, test_collector, args.epoch,
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args.step_per_epoch, args.collect_per_step, args.test_num,
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args.batch_size, train_fn=train_fn, test_fn=test_fn,
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stop_fn=stop_fn, save_fn=save_fn, writer=writer,
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test_in_train=False)
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assert stop_fn(result['best_reward'])
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if __name__ == '__main__':
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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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policy.set_eps(args.eps_test)
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test_envs.seed(args.seed)
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test_collector.reset()
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result = test_collector.collect(n_episode=args.test_num, render=args.render)
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rews, lens = result["rews"], result["lens"]
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print(f"Final reward: {rews.mean()}, length: {lens.mean()}")
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if __name__ == '__main__':
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test_dqn(get_args())
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