Warning: indexing with dtype torch.uint8 is now deprecated, please use a dtype torch.bool instead.

When running the main.py for all variants of DQN, the warning is produced on recent versions of Pytorch (1.2 or higher). I tested this with 1.5, the uint8 is completely deprecated for this version. 

ref: [https://github.com/open-mmlab/mmdetection/pull/2105]

