316 lines
12 KiB
Python
316 lines
12 KiB
Python
"""
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基于 SUMO+TraCI 的 PPO 训练脚本
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使用微观仿真环境训练 VSL 控制策略
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"""
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import os
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import sys
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import yaml
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import numpy as np
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import matplotlib
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matplotlib.use("Agg")
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import matplotlib.pyplot as plt
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from datetime import datetime
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from tqdm import tqdm
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import torch
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from sumo_edge_vsl_environment import SUMOEdgeVSLEnvironment
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from ppo_agent import PPOAgent
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from training_logger import TrainingLogger
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def train_sumo_ppo(resume_checkpoint=None):
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"""SUMO 环境下的 PPO 训练主函数"""
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# 加载配置
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with open("config_sumo_vsl.yaml", "r", encoding="utf-8") as f:
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config = yaml.safe_load(f)
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agent_config = config.get("agent", {})
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train_config = config["training"]
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# 处理resume
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start_episode = 1
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if resume_checkpoint:
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checkpoint_dir = os.path.dirname(resume_checkpoint)
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log_dir = checkpoint_dir.replace("checkpoints_sumo_vsl", "logs_sumo_vsl")
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# 从文件名提取episode数
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filename = os.path.basename(resume_checkpoint)
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if "ep" in filename:
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start_episode = int(filename.split("ep")[1].split("_")[0].split(".")[0]) + 1
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print(f"从 episode {start_episode} 继续训练")
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else:
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timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
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checkpoint_dir = os.path.join(train_config["checkpoint_dir"], timestamp)
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log_dir = os.path.join(train_config["log_dir"], timestamp)
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os.makedirs(checkpoint_dir, exist_ok=True)
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os.makedirs(log_dir, exist_ok=True)
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with open(os.path.join(checkpoint_dir, "config.yaml"), "w", encoding="utf-8") as f:
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yaml.dump(config, f)
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logger = TrainingLogger(log_dir, "ppo", resume=bool(resume_checkpoint))
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# 创建环境
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env = SUMOEdgeVSLEnvironment(config)
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state_dim = env.state_dim
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action_dims = [env.action_dim] * env.num_edges
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print("=" * 70)
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print("PPO 训练 - SUMO+TraCI VSL 环境")
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print("=" * 70)
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print(f" 状态维度: {state_dim}")
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print(f" 控制边数: {env.num_edges}")
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print(f" 每边动作数: {env.action_dim}")
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print(f" Episode 步数: {env.episode_length}")
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print(f" 控制间隔: {env.control_interval}s")
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print(f" 隐藏层: {agent_config.get('hidden_layers', [512, 256])}")
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print(f" 学习率: {agent_config.get('learning_rate', 3e-4)}")
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print(f" 设备: {agent_config.get('device', 'cuda')}")
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print()
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# 创建 PPO 智能体
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agent = PPOAgent(
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state_dim=state_dim,
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action_dims=action_dims,
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hidden_layers=agent_config.get("hidden_layers", [512, 256]),
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learning_rate=agent_config.get("learning_rate", 3e-4),
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gamma=agent_config.get("gamma", 0.99),
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gae_lambda=agent_config.get("gae_lambda", 0.95),
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clip_epsilon=agent_config.get("clip_epsilon", 0.2),
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value_coef=agent_config.get("value_coef", 0.5),
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entropy_coef=agent_config.get("entropy_coef", 0.02),
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max_grad_norm=agent_config.get("max_grad_norm", 0.5),
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ppo_epochs=agent_config.get("ppo_epochs", 10),
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minibatch_size=agent_config.get("batch_size", 64),
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device=agent_config.get("device", "cuda"),
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)
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# 加载checkpoint
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if resume_checkpoint:
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agent.load(resume_checkpoint)
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print(f"已加载模型: {resume_checkpoint}")
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# 训练参数
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num_episodes = train_config["num_episodes"]
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save_freq = train_config.get("save_freq", 50)
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log_freq = train_config.get("log_freq", 10)
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base_seed = train_config.get("random_seed", 42)
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# 统计变量
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episode_rewards = []
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episode_throughputs = []
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episode_mean_speeds = []
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policy_losses = []
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value_losses = []
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entropies = []
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best_reward = -float("inf")
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# 加载历史训练数据
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if resume_checkpoint:
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import csv
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log_file = os.path.join(log_dir, "ppo_training_log.csv")
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if os.path.exists(log_file):
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with open(log_file, "r", encoding="utf-8") as f:
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reader = csv.DictReader(f)
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for row in reader:
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episode_rewards.append(float(row["reward"]))
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episode_throughputs.append(float(row["throughput"]))
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episode_mean_speeds.append(float(row["mean_speed"]))
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if row["policy_loss"]:
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policy_losses.append(float(row["policy_loss"]))
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if row["value_loss"]:
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value_losses.append(float(row["value_loss"]))
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best_reward = max(episode_rewards) if episode_rewards else -float("inf")
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print(f"已加载 {len(episode_rewards)} 条历史记录")
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print("开始训练...\n")
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try:
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for episode in range(start_episode, num_episodes + 1):
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# 每个 episode 使用不同 seed 引入随机性
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seed = base_seed + episode
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state = env.reset(seed=seed)
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episode_reward = 0
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episode_throughput = 0
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episode_speed = 0
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done = False
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step = 0
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pbar = tqdm(
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total=env.episode_length,
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desc=f"Ep {episode}/{num_episodes}",
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leave=False,
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)
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while not done:
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action, log_prob, value = agent.select_action(state, deterministic=False)
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next_state, reward, done, info = env.step(action)
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agent.store_transition(state, action, reward, value, log_prob, done)
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episode_reward += reward
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episode_throughput += info["throughput"]
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episode_speed += info["mean_speed_kmh"]
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state = next_state
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step += 1
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pbar.set_postfix(
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r=f"{episode_reward:.1f}",
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tp=f"{info['throughput']:.0f}",
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v=f"{info['mean_speed_kmh']:.1f}",
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)
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pbar.update(1)
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pbar.close()
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# GAE 计算和策略更新
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if done:
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next_value = 0.0
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else:
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with torch.no_grad():
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next_state_tensor = torch.FloatTensor(next_state).unsqueeze(0).to(agent.device)
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next_value = agent.policy.get_value(next_state_tensor).item()
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train_stats = agent.update(next_value)
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# 记录统计
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avg_tp = episode_throughput / max(step, 1)
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avg_speed = episode_speed / max(step, 1)
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episode_rewards.append(episode_reward)
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episode_throughputs.append(avg_tp)
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episode_mean_speeds.append(avg_speed)
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if train_stats:
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policy_losses.append(train_stats["policy_loss"])
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value_losses.append(train_stats["value_loss"])
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entropies.append(train_stats["entropy"])
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logger.log(episode, episode_reward, avg_tp, avg_speed,
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train_stats["policy_loss"], train_stats["value_loss"], train_stats["entropy"])
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else:
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logger.log(episode, episode_reward, avg_tp, avg_speed)
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# 保存最佳模型
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if episode_reward > best_reward:
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best_reward = episode_reward
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agent.save(os.path.join(checkpoint_dir, "model_best.pt"))
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# 定期日志
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if episode % log_freq == 0:
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recent_rewards = episode_rewards[-log_freq:]
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print(f"\nEpisode {episode}/{num_episodes}")
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print(f" Reward: {episode_reward:.2f} (Avg: {np.mean(recent_rewards):.2f})")
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print(f" Throughput: {avg_tp:.1f} veh/h")
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print(f" Mean Speed: {avg_speed:.1f} km/h")
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if train_stats:
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print(f" Policy Loss: {train_stats['policy_loss']:.4f}")
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print(f" Value Loss: {train_stats['value_loss']:.4f}")
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print(f" Entropy: {train_stats['entropy']:.4f}")
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# 定期保存
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if episode % save_freq == 0:
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agent.save(os.path.join(checkpoint_dir, f"model_ep{episode}.pt"))
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except KeyboardInterrupt:
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print("\n训练被中断，保存当前模型...")
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agent.save(os.path.join(checkpoint_dir, "model_interrupted.pt"))
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finally:
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env.close()
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# 最终保存
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agent.save(os.path.join(checkpoint_dir, f"model_ep{num_episodes}.pt"))
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# 绘制训练曲线
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_plot_training_curves(
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episode_rewards, episode_throughputs, episode_mean_speeds,
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policy_losses, value_losses,
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save_path=os.path.join(log_dir, "training_curves.png"),
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)
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print("=" * 70)
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print("训练完成！")
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print(f" 最佳奖励: {best_reward:.2f}")
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print(f" 模型目录: {checkpoint_dir}")
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print(f" 日志目录: {log_dir}")
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print("=" * 70)
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def _plot_training_curves(
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rewards, throughputs, mean_speeds, policy_losses, value_losses,
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save_path: str,
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):
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"""绘制训练曲线"""
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fig, axes = plt.subplots(2, 3, figsize=(18, 10))
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window = 20
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# Rewards
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axes[0, 0].plot(rewards, alpha=0.4, color="blue")
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if len(rewards) > window:
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ma = np.convolve(rewards, np.ones(window) / window, mode="valid")
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axes[0, 0].plot(range(window - 1, len(rewards)), ma, "r-", linewidth=2)
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axes[0, 0].set_xlabel("Episode")
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axes[0, 0].set_ylabel("Total Reward")
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axes[0, 0].set_title("Episode Reward")
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axes[0, 0].grid(True, alpha=0.3)
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# Throughput
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axes[0, 1].plot(throughputs, alpha=0.4, color="green")
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if len(throughputs) > window:
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ma = np.convolve(throughputs, np.ones(window) / window, mode="valid")
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axes[0, 1].plot(range(window - 1, len(throughputs)), ma, "r-", linewidth=2)
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axes[0, 1].set_xlabel("Episode")
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axes[0, 1].set_ylabel("Avg Throughput (veh/h)")
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axes[0, 1].set_title("Throughput")
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axes[0, 1].grid(True, alpha=0.3)
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# Mean Speed
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axes[0, 2].plot(mean_speeds, alpha=0.4, color="orange")
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if len(mean_speeds) > window:
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ma = np.convolve(mean_speeds, np.ones(window) / window, mode="valid")
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axes[0, 2].plot(range(window - 1, len(mean_speeds)), ma, "r-", linewidth=2)
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axes[0, 2].set_xlabel("Episode")
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axes[0, 2].set_ylabel("Mean Speed (km/h)")
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axes[0, 2].set_title("Mean Speed")
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axes[0, 2].grid(True, alpha=0.3)
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# Policy Loss
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if policy_losses:
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axes[1, 0].plot(policy_losses, "b-", alpha=0.6)
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axes[1, 0].set_xlabel("Episode")
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axes[1, 0].set_ylabel("Policy Loss")
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axes[1, 0].set_title("Policy Loss")
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axes[1, 0].grid(True, alpha=0.3)
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# Value Loss
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if value_losses:
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axes[1, 1].plot(value_losses, "r-", alpha=0.6)
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axes[1, 1].set_xlabel("Episode")
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axes[1, 1].set_ylabel("Value Loss")
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axes[1, 1].set_title("Value Loss")
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axes[1, 1].grid(True, alpha=0.3)
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# Summary text
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axes[1, 2].axis("off")
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summary = (
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f"Training Summary\n"
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f"{'='*30}\n"
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f"Episodes: {len(rewards)}\n"
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f"Best Reward: {max(rewards):.2f}\n"
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f"Final Avg Reward: {np.mean(rewards[-20:]):.2f}\n"
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f"Final Avg Throughput: {np.mean(throughputs[-20:]):.1f}\n"
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f"Final Avg Speed: {np.mean(mean_speeds[-20:]):.1f} km/h"
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)
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axes[1, 2].text(0.1, 0.5, summary, fontsize=12, family="monospace",
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verticalalignment="center", transform=axes[1, 2].transAxes)
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plt.tight_layout()
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plt.savefig(save_path, dpi=150, bbox_inches="tight")
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print(f"训练曲线已保存: {save_path}")
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if __name__ == "__main__":
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import argparse
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parser = argparse.ArgumentParser()
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parser.add_argument("--resume", type=str, help="从checkpoint继续训练，例如: checkpoints_sumo_vsl/xxx/model_ep500.pt")
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args = parser.parse_args()
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train_sumo_ppo(resume_checkpoint=args.resume)
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