https://github.com/SysCV/qdtrack/issues/29
https://stackoverflow.com/questions/50954479/using-cuda-with-pytorch
https://stackoverflow.com/questions/43806326/how-to-run-pytorch-on-gpu-by-default?noredirect=1&lq=1
https://colab.research.google.com/drive/1DIQm9rOx2mT1bZETEeVUThxcrP1RKqAn#scrollTo=81sghL-oijxb