The corresponding paper for this project is L. Liang, H. Ye, and G. Y. Li, "Spectrum sharing in vehicular networks based on multi-agent reinforcement learning," IEEE Journal on Selected Areas in Communications, vol. 37, no. 10, pp. 2282-2292, Oct. 2019. See the author's version of the paper:https://github.com/le-liang/MARLspectrumSharingV2X. The original version is written with Python 3.6 + TensorFlow 1.12.0. I rewrite it with Python 3.6 + Pytorch 1.4.0.