116 lines
4.3 KiB
Python
116 lines
4.3 KiB
Python
#!/usr/bin/env python
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# coding=utf-8
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'''
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@Author: John
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@Email: johnjim0816@gmail.com
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@Date: 2020-06-11 10:01:09
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@LastEditor: John
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@LastEditTime: 2020-06-13 00:24:31
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@Discription:
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@Environment: python 3.7.7
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'''
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'''
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应该是没有收敛，但是pytorch官方教程的结果也差不多
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'''
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import gym
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import torch
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from screen_state import get_screen
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from dqn import DQN
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from plot import plot
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import argparse
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def get_args():
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'''模型建立好之后只需要在这里调参
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'''
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parser = argparse.ArgumentParser()
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parser.add_argument("--gamma", default=0.999, type=float) # q-learning中的gamma
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parser.add_argument("--epsilon_start", default=0.9, type=float) # 基于贪心选择action对应的参数epsilon
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parser.add_argument("--epsilon_end", default=0.05, type=float)
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parser.add_argument("--epsilon_decay", default=200, type=float)
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parser.add_argument("--memory_capacity", default=10000, type=int,help="capacity of Replay Memory")
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parser.add_argument("--batch_size", default=128, type=int,help="batch size of memory sampling")
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parser.add_argument("--max_episodes", default=100, type=int)
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parser.add_argument("--max_steps", default=200, type=int)
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parser.add_argument("--target_update", default=4, type=int,help="when(every default 10 eisodes) to update target net ")
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config = parser.parse_args()
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return config
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if __name__ == "__main__":
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cfg = get_args()
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# if gpu is to be used
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device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
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# Get screen size so that we can initialize layers correctly based on shape
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# returned from AI gym. Typical dimensions at this point are close to 3x40x90
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# which is the result of a clamped and down-scaled render buffer in get_screen(env,device)
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env = gym.make('CartPole-v0').unwrapped
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env.reset()
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init_screen = get_screen(env, device)
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_, _, screen_height, screen_width = init_screen.shape
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# Get number of actions from gym action space
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n_actions = env.action_space.n
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agent = DQN(screen_height=screen_height, screen_width=screen_width,
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n_actions=n_actions, device=device, gamma=cfg.gamma, epsilon_start=cfg.epsilon_start, epsilon_end=cfg.epsilon_end, epsilon_decay=cfg.epsilon_decay, memory_capacity=cfg.memory_capacity,batch_size=cfg.batch_size)
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rewards = []
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moving_average_rewards = []
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for i_episode in range(1,cfg.max_episodes+1):
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# Initialize the environment and state
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env.reset()
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last_screen = get_screen(env, device)
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current_screen = get_screen(env, device)
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state = current_screen - last_screen
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ep_reward = 0
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for t in range(1,cfg.max_steps+1):
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# Select and perform an action
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action = agent.select_action(state)
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_, reward, done, _ = env.step(action.item())
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ep_reward += reward
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reward = torch.tensor([reward], device=device)
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# Observe new state
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last_screen = current_screen
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current_screen = get_screen(env, device)
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if done: break
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next_state = current_screen - last_screen
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# Store the transition in memory
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agent.memory.push(state, action, next_state, reward)
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# Move to the next state
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state = next_state
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# Perform one step of the optimization (on the target network)
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agent.update()
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# Update the target network, copying all weights and biases in DQN
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if i_episode % cfg.target_update == 0:
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agent.target_net.load_state_dict(agent.policy_net.state_dict())
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print('Episode:', i_episode, ' Reward: %i' %int(ep_reward), 'Explore: %.2f' % agent.epsilon)
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rewards.append(ep_reward)
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if i_episode == 1:
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moving_average_rewards.append(ep_reward)
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else:
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moving_average_rewards.append(
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0.9*moving_average_rewards[-1]+0.1*ep_reward)
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import os
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import numpy as np
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output_path = os.path.dirname(__file__)+"/result/"
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if not os.path.exists(output_path):
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os.mkdir(output_path)
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np.save(output_path+"rewards.npy", rewards)
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np.save(output_path+"moving_average_rewards.npy", moving_average_rewards)
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print('Complete！')
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plot(rewards)
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plot(moving_average_rewards,ylabel="moving_average_rewards")
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