127 lines
4.3 KiB
Python
127 lines
4.3 KiB
Python
import argparse
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import os
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import pprint
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import envpool
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import numpy as np
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import torch
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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.policy import PSRLPolicy
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from tianshou.trainer import onpolicy_trainer
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from tianshou.utils import LazyLogger, TensorboardLogger, WandbLogger
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def get_args():
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parser = argparse.ArgumentParser()
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parser.add_argument('--task', type=str, default='NChain-v0')
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parser.add_argument('--seed', type=int, default=1)
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parser.add_argument('--buffer-size', type=int, default=50000)
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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=1000)
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parser.add_argument('--episode-per-collect', type=int, default=1)
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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('--rew-mean-prior', type=float, default=0.0)
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parser.add_argument('--rew-std-prior', type=float, default=1.0)
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parser.add_argument('--gamma', type=float, default=0.99)
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parser.add_argument('--eps', type=float, default=0.01)
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parser.add_argument('--add-done-loop', action="store_true", default=False)
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parser.add_argument(
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'--logger',
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type=str,
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default="wandb",
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choices=["wandb", "tensorboard", "none"],
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)
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return parser.parse_known_args()[0]
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def test_psrl(args=get_args()):
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train_envs = env = envpool.make_gym(
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args.task, num_envs=args.training_num, seed=args.seed
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)
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test_envs = envpool.make_gym(args.task, num_envs=args.test_num, seed=args.seed)
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if args.task == "NChain-v0":
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reward_threshold = 3400
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# reward_threshold = 3647 # described in PSRL paper
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else:
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reward_threshold = None
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print("reward threshold:", reward_threshold)
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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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# 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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n_action = args.action_shape
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n_state = args.state_shape
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trans_count_prior = np.ones((n_state, n_action, n_state))
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rew_mean_prior = np.full((n_state, n_action), args.rew_mean_prior)
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rew_std_prior = np.full((n_state, n_action), args.rew_std_prior)
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policy = PSRLPolicy(
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trans_count_prior, rew_mean_prior, rew_std_prior, args.gamma, args.eps,
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args.add_done_loop
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)
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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=True
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)
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test_collector = Collector(policy, test_envs)
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# Logger
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if args.logger == "wandb":
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logger = WandbLogger(
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save_interval=1, project='psrl', name='wandb_test', config=args
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)
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elif args.logger == "tensorboard":
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log_path = os.path.join(args.logdir, args.task, 'psrl')
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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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else:
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logger = LazyLogger()
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def stop_fn(mean_rewards):
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if reward_threshold:
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return mean_rewards >= reward_threshold
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else:
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return False
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train_collector.collect(n_step=args.buffer_size, random=True)
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# trainer, test it without logger
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result = onpolicy_trainer(
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policy,
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train_collector,
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test_collector,
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args.epoch,
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args.step_per_epoch,
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1,
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args.test_num,
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0,
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episode_per_collect=args.episode_per_collect,
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stop_fn=stop_fn,
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logger=logger,
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test_in_train=False,
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)
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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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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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elif env.spec.reward_threshold:
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assert result["best_reward"] >= env.spec.reward_threshold
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if __name__ == '__main__':
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test_psrl()
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