深度Q学习的输入状态



我使用DQN进行资源分配,代理应将到达请求分配给最佳虚拟机。我正在修改Cartpole代码如下:

import random
import gym
import numpy as np
from collections import deque
from keras.models import Sequential
from keras.layers import Dense
from keras.optimizers import Adam
import os 
class DQNAgent:
def __init__(self, state_size, action_size):
self.state_size = state_size
self.action_size = action_size
self.memory = deque(maxlen=2000)
self.gamma = 0.95 
self.epsilon = 1.0 
self.epsilon_decay = 0.995 
self.epsilon_min = 0.01 
self.learning_rate = 0.001 
self.model = self._build_model()

def _build_model(self):
model = Sequential()
model.add(Dense(24, input_dim=self.state_size, activation='relu')) 
model.add(Dense(24, activation='relu')) 
model.add(Dense(self.action_size, activation='linear')) 
model.compile(loss='mse', optimizer=Adam(lr=self.learning_rate))
return model

def remember(self, state, action, reward, next_state, done):
self.memory.append((state, action, reward, next_state, done)) 
def act(self, state):
if np.random.rand() <= self.epsilon: 
return random.randrange(self.action_size)
act_values = self.model.predict(state) 
return np.argmax(act_values[0])
def replay(self, batch_size):
minibatch = random.sample(self.memory, batch_size) 
for state, action, reward, next_state, done in minibatch: 
target = reward 
if not done: 
target = (reward + self.gamma * np.amax(self.model.predict(next_state)[0])) 
target_f = self.model.predict(state) 
target_f[0][action] = target
self.model.fit(state, target_f, epochs=1, verbose=0)
if self.epsilon > self.epsilon_min:
self.epsilon *= self.epsilon_decay
def load(self, name):
self.model.load_weights(name)
def save(self, name):
self.model.save_weights(name)

作为Q网络输入的Cartpole状态由环境给出。

0   Cart Position
1   Cart Velocity       -Inf    Inf
2   Pole Angle          ~ -41.8°    ~ 41.8°
3   Pole Velocity At Tip

问题是,在我的代码中,Q网络的输入是什么?由于代理应该根据到达请求的大小采取尽可能好的操作,但这不是由环境给出的。我应该用这个输入值,大小来给Q网络供电吗?

深度Q网络架构的输入由重放存储器提供,代码的以下部分:

def remember(self, state, action, reward, next_state, done):
self.memory.append((state, action, reward, next_state, done))

如Deepmind论文中所示,该系统的动态是与系统交互,将转换存储在回放内存中,然后用于训练步骤。在上面的行中,你存储了这些经验。

基本上,网络的输入是状态,并输出Q值。在您的代码中,没有与环境的交互,这时您可以获得这些转换(体验(来提供回放内存。因此,如果你不能提取环境中的一些信息来表示为状态,你就无法对此做出假设。

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