我们可以使用以下步骤来解决此问题:
确定环境和模型。在本例中,我们使用OpenAI Gym环境和A2C强化学习模型。
检查环境,确保其符合要求。在本例中,我们可以检查Gym CartPole环境是否正确安装。我们可以通过以下方式检查:
import gym
env = gym.make('CartPole-v0')
env.reset()
for _ in range(1000):
env.render()
env.step(env.action_space.sample())
env.close()
import torch
import torch.nn as nn
import torch.optim as optim
class A2C(nn.Module):
def __init__(self, input_size, output_size):
super(A2C, self).__init__()
self.policy = nn.Sequential(
nn.Linear(input_size, 64),
nn.ReLU(),
nn.Linear(64, 32),
nn.ReLU(),
nn.Linear(32, output_size)
)
self.value = nn.Sequential(
nn.Linear(input_size, 64),
nn.ReLU(),
nn.Linear(64, 32),
nn.ReLU(),
nn.Linear(32, 1)
)
def forward(self, x):
policies = self.policy(x)
values = self.value(x)
return policies, values
env = gym.make('CartPole-v0')
model = A2C(env.observation_space.shape[0], env.action_space.n)
observation = env.reset()
done = False
while not done:
policies, values = model(torch.tensor([observation], dtype=torch.float))
action = torch.argmax(policies).item()
observation, reward, done, info = env.step(action)