概述
从今天开始我们会开启一个新的篇章, 带领大家来一起学习 (卷进) 强化学习 (Reinforcement Learning). 强化学习基于环境, 分析数据采取行动, 从而最大化未来收益.
强化学习算法种类
On-policy vs Off-policy:
- On-policy: 训练数据由当前 agent 不断与环境交互得到
- Off-policy: 训练的 agent 和与环境交互的 agent 不是同一个 agent, 即别人与环境交互为我提供训练数据
PPO 算法
PPO (Proximal Policy Optimization) 即近端策略优化. PPO 是一种 on-policy 算法, 通过实现小批量更新, 解决了训练过程中新旧策略的变化差异过大导致不易学习的问题.
Actor-Critic 算法
Actor-Critic 算法共分为两部分. 第一部分为策略函数 Actor, 负责生成动作并与环境交互; 第二部分为价值函数, 负责评估 Actor 的表现.
Gym
Gym 是一个强化学习会经常用到的包. Gym 里收集了很多游戏的环境. 下面我们就会用 LunarLander-v2 来实现一个自动版的 “阿波罗登月”.
安装:
pip install gym
如果遇到报错:
AttributeError: module 'gym.envs.box2d' has no attribute 'LunarLander'
解决办法:
pip install gym[box2d]
LunarLander-v2
LunarLander-v2 是一个月球登陆器. 着陆平台位于坐标 (0, 0). 坐标是状态向量的前两个数字, 从屏幕顶部移动到着陆台和零速度的奖励大约是 100 到 140分. 如果着陆器坠毁或停止, 则回合结束, 获得额外的 -100 或 +100点. 每脚接地为 +10, 点火主机每帧 -0.3分, 正解为200分.
启动登陆器
代码:
import gym
# 创建环境
env = gym.make("LunarLander-v2")
# 重置环境
env.reset()
# 启动
for i in range(180):
# 渲染环境
env.render()
# 随机移动
observation, reward, done, info = env.step(env.action_space.sample())
if i % 10 == 0:
# 调试输出
print("观察:", observation)
print("得分:", reward)
输出结果:
观察: [ 0.00861025 1.4061487 0.42930993 -0.11858992 -0.00789343 -0.05729095
0. 0. ]
得分: 0.4097546298543773
观察: [ 0.04917412 1.3876126 0.41002613 -0.13066985 -0.06578191 -0.12604967
0. 0. ]
得分: -1.0858669952763478
观察: [ 0.08917055 1.3429415 0.43598312 -0.2890789 -0.17471936 -0.23913136
0. 0. ]
得分: -2.9339827504803666
观察: [ 0.1326253 1.2450166 0.44708318 -0.5567949 -0.32039645 -0.28250334
0. 0. ]
得分: -2.2779730990326357
观察: [ 0.18323365 1.1110108 0.615291 -0.61922276 -0.43743232 -0.2921057
0. 0. ]
得分: -3.107298313736037
观察: [ 0.24544087 0.94960684 0.66677517 -0.7835077 -0.5929364 -0.2968613
0. 0. ]
得分: -0.5472611013563438
观察: [ 0.3148238 0.75122666 0.7238519 -0.98458177 -0.72915816 -0.26130882
0. 0. ]
得分: -2.5665300894414416
观察: [ 0.38628978 0.49828076 0.74157137 -1.2624744 -0.85754734 -0.37227553
0. 0. ]
得分: -3.2562193227533087
观察: [ 0.46820658 0.18855602 0.92624503 -1.4677961 -1.08614 -0.4508995
0. 0. ]
得分: -4.017106927961208
观察: [ 0.57930076 -0.09440845 1.4345247 -0.693939 -2.0783656 -5.4039164
1. 0. ]
得分: -100
观察: [ 0.7383894 -0.08930686 1.4662493 -0.13461255 -3.653495 -3.109081
0. 0. ]
得分: -100
观察: [ 0.859124 -0.08471288 0.9377837 0.21408719 -3.8998525 0.10151418
0. 0. ]
得分: -100
观察: [ 9.3801367e-01 -4.6761338e-02 6.5999150e-01 1.4583524e-01
-3.9281998e+00 -4.7179851e-06 0.0000000e+00 1.0000000e+00]
得分: -100
观察: [ 0.9879366 -0.04012476 0.33624884 0.08859511 -4.253908 -1.0233303
0. 0. ]
得分: -100
观察: [ 1.0056045 -0.03840658 0.0733737 0.01812508 -4.6796274 -0.6103991
0. 0. ]
得分: -100
观察: [ 1.0112988 -0.03921754 0.07890484 -0.00624387 -4.845023 -0.17111658
0. 0. ]
得分: -100
观察: [ 1.0234139 -0.04488504 0.15701209 -0.0331554 -4.829875 0.07602684
0. 0. ]
得分: -100
观察: [ 1.0306002e+00 -4.8987642e-02 -1.1189224e-02 8.7506004e-04
-4.8712435e+00 -1.5446089e-01 0.0000000e+00 0.0000000e+00]
得分: -100
PPO 算法实现月球登录器
PPO
import torch
import torch.nn as nn
from torch.distributions import Categorical
# 是否使用GPU加速
device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")
print(device)
class Memory:
def __init__(self):
"""初始化"""
self.actions = [] # 行动(共4种)
self.states = [] # 状态, 由8个数字组成
self.logprobs = [] # 概率
self.rewards = [] # 奖励
self.is_terminals = [] # 游戏是否结束
def clear_memory(self):
"""清除memory"""
del self.actions[:]
del self.states[:]
del self.logprobs[:]
del self.rewards[:]
del self.is_terminals[:]
class ActorCritic(nn.Module):
def __init__(self, state_dim, action_dim, n_latent_var):
super(ActorCritic, self).__init__()
# 行动
self.action_layer = nn.Sequential(
# [b, 8] => [b, 64]
nn.Linear(state_dim, n_latent_var),
nn.Tanh(), # 激活
# [b, 64] => [b, 64]
nn.Linear(n_latent_var, n_latent_var),
nn.Tanh(), # 激活
# [b, 64] => [b, 4]
nn.Linear(n_latent_var, action_dim),
nn.Softmax(dim=-1)
)
# 评判
self.value_layer = nn.Sequential(
# [b, 8] => [8, 64]
nn.Linear(state_dim, n_latent_var),
nn.Tanh(), # 激活
# [b, 64] => [b, 64]
nn.Linear(n_latent_var, n_latent_var),
nn.Tanh(),
# [b, 64] => [b, 1]
nn.Linear(n_latent_var, 1)
)
def forward(self):
"""前向传播, 由act替代"""
raise NotImplementedError
def act(self, state, memory):
"""计算行动"""
# 转成张量
state = torch.from_numpy(state).float().to(device)
# 计算4个方向概率
action_probs = self.action_layer(state)
# 通过最大概率计算最终行动方向
dist = Categorical(action_probs)
action = dist.sample()
# 存入memory
memory.states.append(state)
memory.actions.append(action)
memory.logprobs.append(dist.log_prob(action))
# 返回行动
return action.item()
def evaluate(self, state, action):
"""
评估
:param state: 状态, 2000个一组, 形状为 [2000, 8]
:param action: 行动, 2000个一组, 形状为 [2000]
:return:
"""
# 计算行动概率
action_probs = self.action_layer(state)
dist = Categorical(action_probs) # 转换成类别分布
# 计算概率密度, log(概率)
action_logprobs = dist.log_prob(action)
# 计算熵
dist_entropy = dist.entropy()
# 评判
state_value = self.value_layer(state)
state_value = torch.squeeze(state_value) # [2000, 1] => [2000]
# 返回行动概率密度, 评判值, 行动概率熵
return action_logprobs, state_value, dist_entropy
class PPO:
def __init__(self, state_dim, action_dim, n_latent_var, lr, betas, gamma, K_epochs, eps_clip):
self.lr = lr # 学习率
self.betas = betas # betas
self.gamma = gamma # gamma
self.eps_clip = eps_clip # 裁剪, 限制值范围
self.K_epochs = K_epochs # 迭代次数
# 初始化policy
self.policy = ActorCritic(state_dim, action_dim, n_latent_var).to(device)
self.policy_old = ActorCritic(state_dim, action_dim, n_latent_var).to(device)
self.policy_old.load_state_dict(self.policy.state_dict())
self.optimizer = torch.optim.Adam(self.policy.parameters(), lr=lr, betas=betas) # 优化器
self.MseLoss = nn.MSELoss() # 损失函数
def update(self, memory):
"""更新梯度"""
# 蒙特卡罗预测状态回报
rewards = []
discounted_reward = 0
for reward, is_terminal in zip(reversed(memory.rewards), reversed(memory.is_terminals)):
# 回合结束
if is_terminal:
discounted_reward = 0
# 更新削减奖励(当前状态奖励 + 0.99*上一状态奖励
discounted_reward = reward + (self.gamma * discounted_reward)
# 首插入
rewards.insert(0, discounted_reward)
# 标准化奖励
rewards = torch.tensor(rewards, dtype=torch.float32).to(device)
rewards = (rewards - rewards.mean()) / (rewards.std() + 1e-5)
# 张量转换
old_states = torch.stack(memory.states).to(device).detach()
old_actions = torch.stack(memory.actions).to(device).detach()
old_logprobs = torch.stack(memory.logprobs).to(device).detach()
# 迭代优化 K 次:
for _ in range(self.K_epochs):
# 评估
logprobs, state_values, dist_entropy = self.policy.evaluate(old_states, old_actions)
# 计算ratios
ratios = torch.exp(logprobs - old_logprobs.detach())
# 计算损失
advantages = rewards - state_values.detach()
surr1 = ratios * advantages
surr2 = torch.clamp(ratios, 1 - self.eps_clip, 1 + self.eps_clip) * advantages
loss = -torch.min(surr1, surr2) + 0.5 * self.MseLoss(state_values, rewards) - 0.01 * dist_entropy
# 梯度清零
self.optimizer.zero_grad()
# 反向传播
loss.mean().backward()
# 更新梯度
self.optimizer.step()
# 将新的权重赋值给旧policy
self.policy_old.load_state_dict(self.policy.state_dict())
main
import gym
import torch
from PPO import Memory, PPO
############## 超参数 ##############
env_name = "LunarLander-v2" # 游戏名字
env = gym.make(env_name)
state_dim = 8 # 状态维度
action_dim = 4 # 行动维度
render = False # 可视化
solved_reward = 230 # 停止循环条件 (奖励 > 230)
log_interval = 20 # print avg reward in the interval
max_episodes = 50000 # 最大迭代次数
max_timesteps = 300 # 最大单次游戏步数
n_latent_var = 64 # 全连接隐层维度
update_timestep = 2000 # 每2000步policy更新一次
lr = 0.002 # 学习率
betas = (0.9, 0.999) # betas
gamma = 0.99 # gamma
K_epochs = 4 # policy迭代更新次数
eps_clip = 0.2 # PPO 限幅
#############################################
def main():
# 实例化
memory = Memory()
ppo = PPO(state_dim, action_dim, n_latent_var, lr, betas, gamma, K_epochs, eps_clip)
# 存放
total_reward = 0
total_length = 0
timestep = 0
# 训练
for i_episode in range(1, max_episodes + 1):
# 环境初始化
state = env.reset() # 初始化（重新玩）
# 迭代
for t in range(max_timesteps):
timestep += 1
# 用旧policy得到行动
action = ppo.policy_old.act(state, memory)
# 行动
state, reward, done, _ = env.step(action) # 得到（新的状态，奖励，是否终止，额外的调试信息）
# 更新memory(奖励/游戏是否结束)
memory.rewards.append(reward)
memory.is_terminals.append(done)
# 更新梯度
if timestep % update_timestep == 0:
ppo.update(memory)
# memory清零
memory.clear_memory()
# 累计步数清零
timestep = 0
# 累加
total_reward += reward
# 可视化
if render:
env.render()
# 如果游戏结束, 退出
if done:
break
# 游戏步长
total_length += t
# 如果达到要求(230分), 退出循环
if total_reward >= (log_interval * solved_reward):
print("########## Solved! ##########")
# 保存模型
torch.save(ppo.policy.state_dict(), './PPO_{}.pth'.format(env_name))
# 退出循环
break
# 输出log, 每20次迭代
if i_episode % log_interval == 0:
# 求20次迭代平均时长/收益
avg_length = int(total_length / log_interval)
running_reward = int(total_reward / log_interval)
# 调试输出
print('Episode {} \t avg length: {} \t average_reward: {}'.format(i_episode, avg_length, running_reward))
# 清零
total_reward = 0
total_length = 0
if __name__ == '__main__':
main()
输出结果
Episode 20 avg length: 93 reward: -243
Episode 40 avg length: 92 reward: -172
Episode 60 avg length: 79 reward: -192
Episode 80 avg length: 85 reward: -164
Episode 100 avg length: 90 reward: -179
Episode 120 avg length: 100 reward: -201
Episode 140 avg length: 91 reward: -175
Episode 160 avg length: 101 reward: -141
Episode 180 avg length: 86 reward: -153
Episode 200 avg length: 93 reward: -189
Episode 220 avg length: 96 reward: -221
Episode 240 avg length: 105 reward: -140
Episode 260 avg length: 94 reward: -121
Episode 280 avg length: 91 reward: -131
Episode 300 avg length: 91 reward: -122
Episode 320 avg length: 90 reward: -113
Episode 340 avg length: 100 reward: -110
Episode 360 avg length: 110 reward: -92
Episode 380 avg length: 110 reward: -75
Episode 400 avg length: 119 reward: -76
Episode 420 avg length: 162 reward: -77
Episode 440 avg length: 194 reward: -91
Episode 460 avg length: 144 reward: -28
Episode 480 avg length: 192 reward: -8
Episode 500 avg length: 244 reward: -25
Episode 520 avg length: 239 reward: -1
Episode 540 avg length: 269 reward: 21
Episode 560 avg length: 289 reward: 27
Episode 580 avg length: 270 reward: 65
Episode 600 avg length: 264 reward: 86
Episode 620 avg length: 256 reward: 66
Episode 640 avg length: 278 reward: 75
Episode 660 avg length: 235 reward: 11
Episode 680 avg length: 244 reward: 84
Episode 700 avg length: 253 reward: 73
Episode 720 avg length: 292 reward: 63
Episode 740 avg length: 293 reward: 104
Episode 760 avg length: 279 reward: 109
Episode 780 avg length: 246 reward: 86
Episode 800 avg length: 260 reward: 124
Episode 820 avg length: 276 reward: 131
Episode 840 avg length: 269 reward: 121
Episode 860 avg length: 194 reward: 67
Episode 880 avg length: 241 reward: 94
Episode 900 avg length: 259 reward: 98
Episode 920 avg length: 211 reward: 83
Episode 940 avg length: 260 reward: 105
Episode 960 avg length: 194 reward: 65
Episode 980 avg length: 202 reward: 68
Episode 1000 avg length: 243 reward: 79
Episode 1020 avg length: 260 reward: 66
Episode 1040 avg length: 289 reward: 117
Episode 1060 avg length: 252 reward: 94
Episode 1080 avg length: 262 reward: 114
Episode 1100 avg length: 272 reward: 112
Episode 1120 avg length: 263 reward: 97
Episode 1140 avg length: 256 reward: 93
Episode 1160 avg length: 274 reward: 120
Episode 1180 avg length: 256 reward: 117
Episode 1200 avg length: 241 reward: 105
Episode 1220 avg length: 238 reward: 103
Episode 1240 avg length: 267 reward: 121
Episode 1260 avg length: 283 reward: 124
Episode 1280 avg length: 299 reward: 149
Episode 1300 avg length: 281 reward: 126
Episode 1320 avg length: 266 reward: 102
Episode 1340 avg length: 282 reward: 128
Episode 1360 avg length: 275 reward: 114
Episode 1380 avg length: 285 reward: 105
Episode 1400 avg length: 294 reward: 123
Episode 1420 avg length: 293 reward: 132
Episode 1440 avg length: 248 reward: 85
Episode 1460 avg length: 281 reward: 115
Episode 1480 avg length: 291 reward: 152
Episode 1500 avg length: 279 reward: 130
Episode 1520 avg length: 267 reward: 103
Episode 1540 avg length: 270 reward: 137
Episode 1560 avg length: 269 reward: 120
Episode 1580 avg length: 260 reward: 113
Episode 1600 avg length: 282 reward: 147
Episode 1620 avg length: 259 reward: 125
Episode 1640 avg length: 240 reward: 90
Episode 1660 avg length: 284 reward: 125
Episode 1680 avg length: 282 reward: 123
Episode 1700 avg length: 274 reward: 123
Episode 1720 avg length: 273 reward: 130
Episode 1740 avg length: 260 reward: 117
Episode 1760 avg length: 243 reward: 106
Episode 1780 avg length: 241 reward: 90
Episode 1800 avg length: 290 reward: 144
Episode 1820 avg length: 258 reward: 131
Episode 1840 avg length: 283 reward: 142
Episode 1860 avg length: 262 reward: 100
Episode 1880 avg length: 273 reward: 132
Episode 1900 avg length: 255 reward: 92
Episode 1920 avg length: 251 reward: 117
Episode 1940 avg length: 220 reward: 103
Episode 1960 avg length: 221 reward: 111
Episode 1980 avg length: 205 reward: 83
Episode 2000 avg length: 227 reward: 102
Episode 2020 avg length: 251 reward: 123
Episode 2040 avg length: 227 reward: 100
Episode 2060 avg length: 255 reward: 135
Episode 2080 avg length: 273 reward: 136
Episode 2100 avg length: 256 reward: 126
Episode 2120 avg length: 273 reward: 141
Episode 2140 avg length: 280 reward: 109
Episode 2160 avg length: 266 reward: 112
Episode 2180 avg length: 249 reward: 88
Episode 2200 avg length: 247 reward: 119
Episode 2220 avg length: 270 reward: 143
Episode 2240 avg length: 257 reward: 65
Episode 2260 avg length: 250 reward: 30
Episode 2280 avg length: 261 reward: 112
Episode 2300 avg length: 270 reward: 139
Episode 2320 avg length: 275 reward: 128
Episode 2340 avg length: 290 reward: 149
Episode 2360 avg length: 269 reward: 139
Episode 2380 avg length: 272 reward: 137
Episode 2400 avg length: 232 reward: 105
Episode 2420 avg length: 242 reward: 127
Episode 2440 avg length: 241 reward: 134
Episode 2460 avg length: 249 reward: 113
Episode 2480 avg length: 287 reward: 154
Episode 2500 avg length: 289 reward: 149
Episode 2520 avg length: 258 reward: 129
Episode 2540 avg length: 250 reward: 101
Episode 2560 avg length: 287 reward: 158
Episode 2580 avg length: 271 reward: 145
Episode 2600 avg length: 253 reward: 120
Episode 2620 avg length: 255 reward: 127
Episode 2640 avg length: 254 reward: 122
Episode 2660 avg length: 238 reward: 123
Episode 2680 avg length: 243 reward: 115
Episode 2700 avg length: 241 reward: 93
Episode 2720 avg length: 232 reward: 90
Episode 2740 avg length: 215 reward: 83
Episode 2760 avg length: 241 reward: 112
Episode 2780 avg length: 273 reward: 129
Episode 2800 avg length: 269 reward: 133
Episode 2820 avg length: 246 reward: 91
Episode 2840 avg length: 261 reward: 130
Episode 2860 avg length: 261 reward: 136
Episode 2880 avg length: 289 reward: 128
Episode 2900 avg length: 271 reward: 131
Episode 2920 avg length: 277 reward: 145
Episode 2940 avg length: 251 reward: 117
Episode 2960 avg length: 253 reward: 120
Episode 2980 avg length: 270 reward: 133
Episode 3000 avg length: 240 reward: 85
Episode 3020 avg length: 284 reward: 141
Episode 3040 avg length: 255 reward: 117
Episode 3060 avg length: 299 reward: 134
Episode 3080 avg length: 263 reward: 122
Episode 3100 avg length: 259 reward: 126
Episode 3120 avg length: 270 reward: 125
Episode 3140 avg length: 299 reward: 150
Episode 3160 avg length: 256 reward: 116
Episode 3180 avg length: 264 reward: 124
Episode 3200 avg length: 271 reward: 128
Episode 3220 avg length: 259 reward: 122
Episode 3240 avg length: 261 reward: 125
Episode 3260 avg length: 271 reward: 129
Episode 3280 avg length: 242 reward: 126
Episode 3300 avg length: 218 reward: 93
Episode 3320 avg length: 230 reward: 116
Episode 3340 avg length: 223 reward: 109
Episode 3360 avg length: 249 reward: 122
Episode 3380 avg length: 224 reward: 104
Episode 3400 avg length: 261 reward: 131
Episode 3420 avg length: 280 reward: 140
Episode 3440 avg length: 264 reward: 125
Episode 3460 avg length: 247 reward: 105
Episode 3480 avg length: 276 reward: 141
Episode 3500 avg length: 282 reward: 149
Episode 3520 avg length: 282 reward: 141
Episode 3540 avg length: 290 reward: 152
Episode 3560 avg length: 282 reward: 141
Episode 3580 avg length: 291 reward: 151
Episode 3600 avg length: 289 reward: 166
Episode 3620 avg length: 266 reward: 142
Episode 3640 avg length: 277 reward: 91
Episode 3660 avg length: 272 reward: 114
Episode 3680 avg length: 281 reward: 159
Episode 3700 avg length: 287 reward: 160
Episode 3720 avg length: 254 reward: 78
Episode 3740 avg length: 296 reward: 174
Episode 3760 avg length: 267 reward: 124
Episode 3780 avg length: 273 reward: 148
Episode 3800 avg length: 275 reward: 147
Episode 3820 avg length: 276 reward: 145
Episode 3840 avg length: 283 reward: 151
Episode 3860 avg length: 275 reward: 142
Episode 3880 avg length: 290 reward: 142
Episode 3900 avg length: 290 reward: 154
Episode 3920 avg length: 283 reward: 141
Episode 3940 avg length: 273 reward: 145
Episode 3960 avg length: 290 reward: 161
Episode 3980 avg length: 268 reward: 145
Episode 4000 avg length: 270 reward: 142
Episode 4020 avg length: 283 reward: 156
Episode 4040 avg length: 283 reward: 149
Episode 4060 avg length: 299 reward: 172
Episode 4080 avg length: 292 reward: 158
Episode 4100 avg length: 274 reward: 143
Episode 4120 avg length: 299 reward: 163
Episode 4140 avg length: 290 reward: 153
Episode 4160 avg length: 299 reward: 165
Episode 4180 avg length: 290 reward: 160
Episode 4200 avg length: 299 reward: 157
Episode 4220 avg length: 299 reward: 171
Episode 4240 avg length: 271 reward: 148
Episode 4260 avg length: 265 reward: 139
Episode 4280 avg length: 258 reward: 137
Episode 4300 avg length: 280 reward: 137
Episode 4320 avg length: 262 reward: 133
Episode 4340 avg length: 255 reward: 110
Episode 4360 avg length: 275 reward: 134
Episode 4380 avg length: 282 reward: 154
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Episode 16020 avg length: 270 reward: 140
Episode 16040 avg length: 251 reward: 131
Episode 16060 avg length: 258 reward: 124
Episode 16080 avg length: 268 reward: 130
Episode 16100 avg length: 263 reward: 125
Episode 16120 avg length: 280 reward: 150
Episode 16140 avg length: 267 reward: 132
Episode 16160 avg length: 284 reward: 137
Episode 16180 avg length: 275 reward: 128
Episode 16200 avg length: 269 reward: 132
Episode 16220 avg length: 280 reward: 132
Episode 16240 avg length: 279 reward: 145
Episode 16260 avg length: 299 reward: 152
Episode 16280 avg length: 238 reward: 112
Episode 16300 avg length: 284 reward: 159
Episode 16320 avg length: 280 reward: 136
Episode 16340 avg length: 271 reward: 120
Episode 16360 avg length: 281 reward: 139
Episode 16380 avg length: 267 reward: 141
Episode 16400 avg length: 299 reward: 164
Episode 16420 avg length: 239 reward: 113
Episode 16440 avg length: 276 reward: 143
Episode 16460 avg length: 268 reward: 144
Episode 16480 avg length: 269 reward: 134
Episode 16500 avg length: 273 reward: 148
Episode 16520 avg length: 247 reward: 97
Episode 16540 avg length: 266 reward: 129
Episode 16560 avg length: 267 reward: 119
Episode 16580 avg length: 270 reward: 124
Episode 16600 avg length: 262 reward: 101
Episode 16620 avg length: 257 reward: 121
Episode 16640 avg length: 233 reward: 99
Episode 16660 avg length: 268 reward: 114
Episode 16680 avg length: 261 reward: 126
Episode 16700 avg length: 278 reward: 143
Episode 16720 avg length: 278 reward: 117
Episode 16740 avg length: 266 reward: 135
Episode 16760 avg length: 282 reward: 140
Episode 16780 avg length: 299 reward: 154
Episode 16800 avg length: 279 reward: 144
Episode 16820 avg length: 281 reward: 124
Episode 16840 avg length: 280 reward: 132
Episode 16860 avg length: 278 reward: 148
Episode 16880 avg length: 280 reward: 113
Episode 16900 avg length: 268 reward: 133
Episode 16920 avg length: 291 reward: 147
Episode 16940 avg length: 274 reward: 150
Episode 16960 avg length: 281 reward: 137
Episode 16980 avg length: 251 reward: 126
Episode 17000 avg length: 261 reward: 135
Episode 17020 avg length: 267 reward: 105
Episode 17040 avg length: 274 reward: 176
Episode 17060 avg length: 262 reward: 131
Episode 17080 avg length: 186 reward: 184
Episode 17100 avg length: 225 reward: 150
Episode 17120 avg length: 201 reward: 218
Episode 17140 avg length: 211 reward: 220
Episode 17160 avg length: 221 reward: 218
Episode 17180 avg length: 232 reward: 210
Episode 17200 avg length: 216 reward: 220
Episode 17220 avg length: 226 reward: 203
Episode 17240 avg length: 198 reward: 170
Episode 17260 avg length: 196 reward: 222
Episode 17280 avg length: 214 reward: 196
Episode 17300 avg length: 229 reward: 205
Episode 17320 avg length: 183 reward: 192
Episode 17340 avg length: 212 reward: 186
Episode 17360 avg length: 192 reward: 164
########## Solved! ##########
到此这篇关于Python强化练习之PyTorch opp算法实现月球登陆器的文章就介绍到这了,更多相关Python OPP内容请搜索服务器之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持服务器之家！
原文链接：https://blog.csdn.net/weixin_46274168/article/details/120426499
