210 lines
7.4 KiB
Python
210 lines
7.4 KiB
Python
"""
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基于 SUMO+TraCI 的 TD3 训练脚本
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使用 Stable-Baselines3 的 TD3 算法
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"""
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import os
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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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from sumo_edge_vsl_environment import SUMOEdgeVSLEnvironment
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from td3_agent import TD3Agent
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from training_logger import TrainingLogger
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def train_sumo_td3():
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"""SUMO 环境下的 TD3 训练主函数"""
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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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timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
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checkpoint_dir = os.path.join("checkpoints_sumo_td3", timestamp)
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log_dir = os.path.join("logs_sumo_td3", 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, "td3")
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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("TD3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" 动作空间: {action_dims}")
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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" 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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agent = TD3Agent(
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state_dim=state_dim,
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action_dims=action_dims,
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learning_rate=agent_config.get("learning_rate", 3e-4),
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buffer_size=agent_config.get("buffer_size", 100000),
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learning_starts=agent_config.get("learning_starts", 1000),
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batch_size=agent_config.get("batch_size", 256),
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tau=agent_config.get("tau", 0.005),
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gamma=agent_config.get("gamma", 0.99),
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policy_delay=agent_config.get("policy_delay", 2),
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device=agent_config.get("device", "cuda"),
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)
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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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episode_rewards = []
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episode_throughputs = []
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episode_mean_speeds = []
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episode_hard_brakes = []
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best_reward = -float("inf")
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print("开始训练...\n")
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try:
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for episode in range(1, num_episodes + 1):
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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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episode_brakes = 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, _, _ = 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, next_state, done)
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agent.update()
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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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episode_brakes += info["num_hard_brakes"]
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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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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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episode_hard_brakes.append(episode_brakes)
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logger.log(episode, episode_reward, avg_tp, avg_speed, episode_brakes)
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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"))
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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 episode % save_freq == 0:
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agent.save(os.path.join(checkpoint_dir, f"model_ep{episode}"))
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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"))
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finally:
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env.close()
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agent.save(os.path.join(checkpoint_dir, f"model_ep{num_episodes}"))
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_plot_training_curves(
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episode_rewards, episode_throughputs, episode_mean_speeds, episode_hard_brakes,
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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(rewards, throughputs, mean_speeds, hard_brakes, save_path: str):
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"""绘制训练曲线"""
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fig, axes = plt.subplots(2, 2, figsize=(15, 10))
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window = 20
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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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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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axes[1, 0].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[1, 0].plot(range(window - 1, len(mean_speeds)), ma, "r-", linewidth=2)
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axes[1, 0].set_xlabel("Episode")
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axes[1, 0].set_ylabel("Mean Speed (km/h)")
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axes[1, 0].set_title("Mean Speed")
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axes[1, 0].grid(True, alpha=0.3)
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axes[1, 1].plot(hard_brakes, alpha=0.4, color="red")
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if len(hard_brakes) > window:
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ma = np.convolve(hard_brakes, np.ones(window) / window, mode="valid")
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axes[1, 1].plot(range(window - 1, len(hard_brakes)), ma, "r-", linewidth=2)
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axes[1, 1].set_xlabel("Episode")
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axes[1, 1].set_ylabel("Hard Brakes Count")
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axes[1, 1].set_title("Hard Brakes")
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axes[1, 1].grid(True, alpha=0.3)
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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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train_sumo_td3()
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