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Zhongwei Li
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skills/pufferlib/scripts/train_template.py
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239
skills/pufferlib/scripts/train_template.py
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#!/usr/bin/env python3
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"""
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PufferLib Training Template
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This template provides a complete training script for reinforcement learning
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with PufferLib. Customize the environment, policy, and training configuration
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as needed for your use case.
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"""
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import argparse
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import torch
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import torch.nn as nn
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import pufferlib
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from pufferlib import PuffeRL
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from pufferlib.pytorch import layer_init
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class Policy(nn.Module):
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"""Example policy network."""
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def __init__(self, observation_space, action_space, hidden_size=256):
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super().__init__()
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self.observation_space = observation_space
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self.action_space = action_space
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# Encoder network
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self.encoder = nn.Sequential(
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layer_init(nn.Linear(observation_space.shape[0], hidden_size)),
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nn.ReLU(),
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layer_init(nn.Linear(hidden_size, hidden_size)),
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nn.ReLU()
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)
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# Policy head (actor)
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self.actor = layer_init(nn.Linear(hidden_size, action_space.n), std=0.01)
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# Value head (critic)
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self.critic = layer_init(nn.Linear(hidden_size, 1), std=1.0)
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def forward(self, observations):
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"""Forward pass through policy."""
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features = self.encoder(observations)
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logits = self.actor(features)
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value = self.critic(features)
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return logits, value
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def make_env():
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"""Create environment. Customize this for your task."""
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# Option 1: Use Ocean environment
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return pufferlib.make('procgen-coinrun', num_envs=256)
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# Option 2: Use Gymnasium environment
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# return pufferlib.make('gym-CartPole-v1', num_envs=256)
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# Option 3: Use custom environment
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# from my_envs import MyEnvironment
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# return pufferlib.emulate(MyEnvironment, num_envs=256)
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def create_policy(env):
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"""Create policy network."""
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return Policy(
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observation_space=env.observation_space,
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action_space=env.action_space,
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hidden_size=256
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)
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def train(args):
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"""Main training function."""
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# Set random seeds
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torch.manual_seed(args.seed)
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# Create environment
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print(f"Creating environment with {args.num_envs} parallel environments...")
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env = pufferlib.make(
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args.env_name,
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num_envs=args.num_envs,
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num_workers=args.num_workers
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)
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# Create policy
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print("Initializing policy...")
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policy = create_policy(env)
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if args.device == 'cuda' and torch.cuda.is_available():
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policy = policy.cuda()
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print(f"Using GPU: {torch.cuda.get_device_name(0)}")
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else:
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print("Using CPU")
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# Create logger
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if args.logger == 'wandb':
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from pufferlib import WandbLogger
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logger = WandbLogger(
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project=args.project,
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name=args.exp_name,
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config=vars(args)
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)
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elif args.logger == 'neptune':
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from pufferlib import NeptuneLogger
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logger = NeptuneLogger(
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project=args.project,
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name=args.exp_name,
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api_token=args.neptune_token
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)
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else:
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from pufferlib import NoLogger
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logger = NoLogger()
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# Create trainer
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print("Creating trainer...")
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trainer = PuffeRL(
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env=env,
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policy=policy,
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device=args.device,
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learning_rate=args.learning_rate,
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batch_size=args.batch_size,
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n_epochs=args.n_epochs,
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gamma=args.gamma,
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gae_lambda=args.gae_lambda,
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clip_coef=args.clip_coef,
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ent_coef=args.ent_coef,
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vf_coef=args.vf_coef,
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max_grad_norm=args.max_grad_norm,
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logger=logger,
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compile=args.compile
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)
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# Training loop
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print(f"Starting training for {args.num_iterations} iterations...")
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for iteration in range(1, args.num_iterations + 1):
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# Collect rollouts
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rollout_data = trainer.evaluate()
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# Train on batch
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train_metrics = trainer.train()
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# Log results
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trainer.mean_and_log()
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# Save checkpoint
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if iteration % args.save_freq == 0:
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checkpoint_path = f"{args.checkpoint_dir}/checkpoint_{iteration}.pt"
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trainer.save_checkpoint(checkpoint_path)
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print(f"Saved checkpoint to {checkpoint_path}")
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# Print progress
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if iteration % args.log_freq == 0:
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mean_reward = rollout_data.get('mean_reward', 0)
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sps = rollout_data.get('sps', 0)
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print(f"Iteration {iteration}/{args.num_iterations} | "
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f"Mean Reward: {mean_reward:.2f} | "
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f"SPS: {sps:,.0f}")
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print("Training complete!")
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# Save final model
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final_path = f"{args.checkpoint_dir}/final_model.pt"
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trainer.save_checkpoint(final_path)
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print(f"Saved final model to {final_path}")
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def main():
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parser = argparse.ArgumentParser(description='PufferLib Training')
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# Environment
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parser.add_argument('--env-name', type=str, default='procgen-coinrun',
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help='Environment name')
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parser.add_argument('--num-envs', type=int, default=256,
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help='Number of parallel environments')
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parser.add_argument('--num-workers', type=int, default=8,
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help='Number of vectorization workers')
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# Training
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parser.add_argument('--num-iterations', type=int, default=10000,
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help='Number of training iterations')
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parser.add_argument('--learning-rate', type=float, default=3e-4,
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help='Learning rate')
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parser.add_argument('--batch-size', type=int, default=32768,
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help='Batch size for training')
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parser.add_argument('--n-epochs', type=int, default=4,
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help='Number of training epochs per batch')
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parser.add_argument('--device', type=str, default='cuda',
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choices=['cuda', 'cpu'], help='Device to use')
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# PPO Parameters
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parser.add_argument('--gamma', type=float, default=0.99,
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help='Discount factor')
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parser.add_argument('--gae-lambda', type=float, default=0.95,
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help='GAE lambda')
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parser.add_argument('--clip-coef', type=float, default=0.2,
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help='PPO clipping coefficient')
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parser.add_argument('--ent-coef', type=float, default=0.01,
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help='Entropy coefficient')
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parser.add_argument('--vf-coef', type=float, default=0.5,
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help='Value function coefficient')
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parser.add_argument('--max-grad-norm', type=float, default=0.5,
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help='Maximum gradient norm')
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# Logging
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parser.add_argument('--logger', type=str, default='none',
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choices=['wandb', 'neptune', 'none'],
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help='Logger to use')
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parser.add_argument('--project', type=str, default='pufferlib-training',
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help='Project name for logging')
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parser.add_argument('--exp-name', type=str, default='experiment',
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help='Experiment name')
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parser.add_argument('--neptune-token', type=str, default=None,
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help='Neptune API token')
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parser.add_argument('--log-freq', type=int, default=10,
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help='Logging frequency (iterations)')
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# Checkpointing
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parser.add_argument('--checkpoint-dir', type=str, default='checkpoints',
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help='Directory to save checkpoints')
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parser.add_argument('--save-freq', type=int, default=100,
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help='Checkpoint save frequency (iterations)')
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# Misc
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parser.add_argument('--seed', type=int, default=42,
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help='Random seed')
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parser.add_argument('--compile', action='store_true',
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help='Use torch.compile for faster training')
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args = parser.parse_args()
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# Create checkpoint directory
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import os
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os.makedirs(args.checkpoint_dir, exist_ok=True)
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# Run training
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train(args)
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if __name__ == '__main__':
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main()
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