MetaLight is a value-based meta-reinforcement learning framework for traffic signal control. This repository includes the detailed implementation of our MetaLight paper which was published in AAAI 2020.

Usage and more information can be found below.

This repo contrains four real-world datasets (Hangzhou, Jinan, Atlanta, and Los Angeles) which are stored in the data.zip. Please unzip it first before you run the code. More descriptions about the dataset can be found in our MetaLight paper.

• python 3.*
• tensorflow v1.0+
• cityflow

We recommend to run the code through docker and a sample docker image has been built for your quick start.

1. Please pull the docker image from the docker hub. docker pull synthzxs/metalight:latest (Alternatively, you can use the docker/dockerfile to build the docker image directly on your linux system)

2. Please pull the codes for MetaLight from this repo. git clone https://github.com/zxsRambo/metalight.git

3. Please run the built docker image, synthzxs/metalight:latest, to initiate a docker container. Please remember to mount the code directory. docker run -it -v /local_path_to_the_code/metalight/:/metalight/ synthzxs/metalight:latest /bin/bash Up to now, the experiment environment has been set up. Then, go the workspace in the docker contrainer, cd /metalight, and try to run the code.

Start an example:

sh run_exp.sh

In this utils, it runs the file meta_train.py. Here are some important arguments that can be modified for different experiments:

• memo: the memo name of the experiment
• algorithm: the specified algorithm, e.g., MetaLight, FRAPPlus.

Hyperparameters such as learning rate, sample size and the like for the agent can also be assigned in our code and they are easy to tune for better performance.

• FRAP: base model for MetaLight
• CityFlow: traffic simulator
• Collection of team works on RL for traffic signal control

If you find this work useful in your research, please cite our paper "MetaLight: Value-based Meta-reinforcement Learning for Traffic Signal Control".

@inproceedings{metalight,
  title={MetaLight: Value-based Meta-reinforcement Learning for Traffic Signal Control},
  author={Zang, Xinshi and Yao, Huaxiu and Zheng, Guanjie and Xu, Nan and Xu, Kai and Li, Zhenhui},
  booktitle={Proceedings of the AAAI Conference on Artificial Intelligence},
  year={2020}
}