If you find our code useful, please also consider citing our paper:
@ARTICLE{10002321, author={Fan, Mingfeng and Wu, Yaoxin and Liao, Tianjun and Cao, Zhiguang and Guo, Hongliang and Sartoretti, Guillaume and Wu, Guohua}, journal={IEEE Transactions on Vehicular Technology}, title={Deep Reinforcement Learning for UAV Routing in the Presence of Multiple Charging Stations}, year={2023}, volume={72}, number={5}, pages={5732-5746}, doi={10.1109/TVT.2022.3232607}}