🆕✅🎉 updated code: 10th September 2020: bug fixes + support recurrent policy.

This repository contains code to train baseline ppo agent in Procgen implemented with Pytorch.

This implementation is inspired to accelerate the research in procgen environment. It aims to reproduce the result in Procgen paper. Code is designed to satisfy both readability and productivity. I tried to match the code as close as possible to OpenAI baselines's while following the coding style from ikostrikov's.

There were several key points to watch out for procgen, which differ from the general RL implementations

• Xavier uniform initialization was used for conv layers rather than orthogonal initialization.
• Do not use observation normalization
• Gradient accumulation to handle large mini-batch size.

Training logs for starpilot can be found on logs/procgen/starpilot.

• python>=3.6
• torch 1.3
• procgen
• pyyaml

Use train.py to train the agent in procgen environment. It has the following arguments:

• --exp_name: ID to designate your expriment.s
• --env_name: Name of the Procgen environment.
• --start_level: Start level for for environment.
• --num_levels: Number of training levels for environment.
• --distribution_mode: Mode of your environ
• --param_name: Configurations name for your training. By default, the training loads hyperparameters from config.yml/procgen/param_name.
• --num_timesteps: Number of total timesteps to train your agent.

After you start training your agent, log and parameters are automatically stored in logs/procgen/env-name/exp-name/

Sample efficiency on easy environments

python train.py --exp_name easy-run-all --env_name ENV_NAME --param_name easy --num_levels 0 --distribution_mode easy --num_timesteps 25000000

Sample efficiency on hard environments

python train.py --exp_name hard-run-all --env_name ENV_NAME --param_name hard --num_levels 0 --distribution_mode hard --num_timesteps 200000000

Generalization on easy environments

python train.py --exp_name easy-run-200 --env_name ENV_NAME --param_name easy-200 --num_levels 200 --distribution_mode easy --num_timesteps 25000000

Generalization on hard environments

python train.py --exp_name hard-run-500 --env_name ENV_NAME --param_name hard-500 --num_levels 500 --distribution_mode hard --num_timesteps 200000000

If your GPU device could handle larger memory than 5GB, increase the mini-batch size to facilitate the trianing.

• Implement Data Augmentation from RAD.
• Create evaluation code to measure the test performance.

[1] PPO: Human-level control through deep reinforcement learning
[2] GAE: High-Dimensional Continuous Control Using Generalized Advantage Estimation
[3] IMPALA: Scalable Distributed Deep-RL with Importance Weighted Actor-Learner Architectures
[4] Implementation Matters in Deep Policy Gradients: A Case Study on PPO and TRPO
[5] Leveraging Procedural Generation to Benchmark Reinforcement Learning