70 lines
2.1 KiB
Python
70 lines
2.1 KiB
Python
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"""
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Here, we wrap the original environment to make it easier
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to use. When a game is finished, instead of mannualy reseting
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the environment, we do it automatically.
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"""
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import numpy as np
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import torch
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def _format_observation(obs, device):
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"""
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A utility function to process observations and
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move them to CUDA.
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"""
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position = obs['position']
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device = torch.device('cuda:'+str(device))
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x_batch = torch.from_numpy(obs['x_batch']).to(device)
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z_batch = torch.from_numpy(obs['z_batch']).to(device)
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x_no_action = torch.from_numpy(obs['x_no_action'])
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z = torch.from_numpy(obs['z'])
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obs = {'x_batch': x_batch,
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'z_batch': z_batch,
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'legal_actions': obs['legal_actions'],
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}
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return position, obs, x_no_action, z
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class Environment:
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def __init__(self, env, device):
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""" Initialzie this environment wrapper
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"""
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self.env = env
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self.device = device
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self.episode_return = None
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def initial(self):
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initial_position, initial_obs, x_no_action, z = _format_observation(self.env.reset(), self.device)
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initial_reward = torch.zeros(1, 1)
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self.episode_return = torch.zeros(1, 1)
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initial_done = torch.ones(1, 1, dtype=torch.bool)
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return initial_position, initial_obs, dict(
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done=initial_done,
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episode_return=self.episode_return,
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obs_x_no_action=x_no_action,
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obs_z=z,
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)
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def step(self, action):
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obs, reward, done, _ = self.env.step(action)
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self.episode_return += reward
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episode_return = self.episode_return
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if done:
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obs = self.env.reset()
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self.episode_return = torch.zeros(1, 1)
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position, obs, x_no_action, z = _format_observation(obs, self.device)
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reward = torch.tensor(reward).view(1, 1)
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done = torch.tensor(done).view(1, 1)
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return position, obs, dict(
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done=done,
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episode_return=episode_return,
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obs_x_no_action=x_no_action,
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obs_z=z,
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)
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def close(self):
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self.env.close()
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