SnakeGym

Gym environment based on the classic Snake game. Based on PyTorch and supports parallel data collection from each core of your CPU.

Foreword

I have made this project as modular as possible, allowing easy adjustments to network architecture, learning algorithm, and even for quickly switching from one Gym environment to another.

Contents

1. Setup Instructions and Dependencies
2. Training Agents
3. Testing Agents
4. Repository Overview

1. Setup Instructions and Dependencies

You may setup the repository on your local machine by either downloading it or running the following line on terminal.

git clone https://github.com/Atharv24/SnakeGym.git

All dependencies required by this repo are listed in requirements.txt. You can install them manually or setup a virtual environment with PyTorch and running

pip install -r requirements.txt

Make sure to install latest CUDA and cuDNN if you want to use GPU acceleration.

2. Training Agents

To train your agent from scratch

• Setup your parameters in a config file and move it to configs folder.
• Run the following command in terminal

python train.py -config name_of_config

For example :

python train.py -config Default_SP

Will start training with the default parameters set by me.

• Data for each agent will be stored in agents folder.
• Network and optimizer weights will be saved whenever the agent is evaluated. You can set this frequency with TEST_FREQ parameter in the config file.
• To resume training from last saved checkpoint, add --resume in terminal.

python train.py -config myConfig --resume

• For more efficient data collection, increase the NUM_ENVS parameter in the config file. (Using more cores than what your CPU has will throw an error)
• The RENDER_TRAINING and RENDER_TESTING parameters are self explanatory. Note that disabling rendering will lead to faster data collection and hence faster training.
• You can also set the RENDER_WAIT_TIME to your need. Increasing this parameter will reduce the FPS and vice-versa.
• TensorboardX logs can be found in the logs subdirectory in your agent's folder.
• The training will conclude when the agent reaches the TARGET_REWARD in 4 out of 5 test games.

3. Testing Agents

To test a trained agent run

python test.py -agent_name AGENT_NAME -num_games N

For example

python test.py -agent_name Default_SP -num_games 10

• The -num_games parameter is optional and will default to 5 if not provided.
• At the end of testing scores for each game will be printed in the terminal.

4. Repository Overview

• agents: Folder containing data for each agent.

  Each agent folder contains:

  • logs: TensorboardX logs containing the critic and actor losses, action space entropy and agent advantage estimates.
  • saved_models: Network and optimizer weights saved in *.pt format for testing/resuming training.
  • config.ini: The same configuration file used for training.

• configs: Folder containing configuration files in *.ini format.

• lib: Folder containing scripts used for training and testing.

  • algos: Algorithms used for training the agent.
    Currently only has Proximal Policy Optimization (PPO).

  • envs: Gym environments for data collection.
    Single player Snake is ready and Multiplayer is a WIP.

  • nets: Neural network architecture for agent's brain.

  • utils: Misc utils required by the project. Currently only has multiprocessing_env.py that I took and modified from OpenAI baselines.

• train.py: Script for training agents.

• test.py: Script for testing agents.