drl-mtsp's Introduction

A reinforcement learning approach for optimizing multiple traveling salesman problems over graphs

Some differences compared with the original paper

We use GIN as the graph embedding network.
We use a shared self-attention module for customer assignment.
The official implementation can be found Here.
Paper reference:

@article{hu2020reinforcement,
  title={A reinforcement learning approach for optimizing multiple traveling salesman problems over graphs},
  author={Hu, Yujiao and Yao, Yuan and Lee, Wee Sun},
  journal={Knowledge-Based Systems},
  volume={204},
  pages={106244},
  year={2020},
  publisher={Elsevier}
}

We claim that our implementation has the better performance than the original one.

Installation

python 3.8.8

CUDA 11.1

pytorch 1.9.0 with CUDA 11.1

PyG 1.7.2

Or-Tools 9.0.9048

Then install dependencies:

cd ~
pip install --upgrade pip
pip install torch-scatter==2.0.6 -f https://pytorch-geometric.com/whl/torch-1.9.0+cu111.html
pip install torch-sparse==0.6.9 -f https://pytorch-geometric.com/whl/torch-1.9.0+cu111.html
pip install torch-cluster==1.5.9 -f https://pytorch-geometric.com/whl/torch-1.9.0+cu111.html
pip install torch-spline-conv==1.2.1 -f https://pytorch-geometric.com/whl/torch-1.9.0+cu111.html
pip install torch-geometric==1.7.2
pip install ortools==9.0.9048

Use code

Training

python3 train.py

Testing

python3 test.py

Generate validation and testing dataset

Adjust parameters in data_generator.py, then run python3 data_generator.py

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drl-mtsp's Issues

Performance are lower than ortools solver

Thank you for the implementation. After several days spent on this code I still can't show that the implementation exceeds the results of ortools. Is this normal?

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