94 lines
3.1 KiB
Python
94 lines
3.1 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: 2021-03-12 21:14:12
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LastEditor: John
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LastEditTime: 2022-08-29 14:24:44
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Discription:
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Environment:
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'''
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import torch
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import torch.nn as nn
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import torch.nn.functional as F
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from torch.distributions import Categorical
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class MLP(nn.Module):
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def __init__(self, input_dim,output_dim,hidden_dim=128):
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""" 初始化q网络，为全连接网络
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input_dim: 输入的特征数即环境的状态维度
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output_dim: 输出的动作维度
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"""
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super(MLP, self).__init__()
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self.fc1 = nn.Linear(input_dim, hidden_dim) # 输入层
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self.fc2 = nn.Linear(hidden_dim,hidden_dim) # 隐藏层
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self.fc3 = nn.Linear(hidden_dim, output_dim) # 输出层
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def forward(self, x):
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# 各层对应的激活函数
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x = F.relu(self.fc1(x))
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x = F.relu(self.fc2(x))
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return self.fc3(x)
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class ActorSoftmax(nn.Module):
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def __init__(self, input_dim, output_dim, hidden_dim=256):
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super(ActorSoftmax, self).__init__()
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self.fc1 = nn.Linear(input_dim, hidden_dim)
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self.fc2 = nn.Linear(hidden_dim, output_dim)
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def forward(self,state):
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dist = F.relu(self.fc1(state))
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dist = F.softmax(self.fc2(dist),dim=1)
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return dist
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class Critic(nn.Module):
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def __init__(self,input_dim,output_dim,hidden_dim=256):
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super(Critic,self).__init__()
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assert output_dim == 1 # critic must output a single value
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self.fc1 = nn.Linear(input_dim, hidden_dim)
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self.fc2 = nn.Linear(hidden_dim, output_dim)
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def forward(self,state):
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value = F.relu(self.fc1(state))
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value = self.fc2(value)
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return value
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class ActorCriticSoftmax(nn.Module):
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def __init__(self, input_dim, output_dim, actor_hidden_dim=256,critic_hidden_dim=256):
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super(ActorCriticSoftmax, self).__init__()
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self.critic_fc1 = nn.Linear(input_dim, critic_hidden_dim)
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self.critic_fc2 = nn.Linear(critic_hidden_dim, 1)
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self.actor_fc1 = nn.Linear(input_dim, actor_hidden_dim)
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self.actor_fc2 = nn.Linear(actor_hidden_dim, output_dim)
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def forward(self, state):
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# state = Variable(torch.from_numpy(state).float().unsqueeze(0))
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value = F.relu(self.critic_fc1(state))
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value = self.critic_fc2(value)
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policy_dist = F.relu(self.actor_fc1(state))
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policy_dist = F.softmax(self.actor_fc2(policy_dist), dim=1)
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return value, policy_dist
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class ActorCritic(nn.Module):
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def __init__(self, n_states, n_actions, hidden_dim=256):
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super(ActorCritic, self).__init__()
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self.critic = nn.Sequential(
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nn.Linear(n_states, hidden_dim),
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nn.ReLU(),
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nn.Linear(hidden_dim, 1)
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)
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self.actor = nn.Sequential(
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nn.Linear(n_states, hidden_dim),
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nn.ReLU(),
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nn.Linear(hidden_dim, n_actions),
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nn.Softmax(dim=1),
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)
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def forward(self, x):
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value = self.critic(x)
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probs = self.actor(x)
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dist = Categorical(probs)
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return dist, value |