Pretrained unofficially implementation of Digging Mono3D

We provide an Unofficial re-implementation of Digging Into Output Representation For Monocular 3D Object Detection (Digging_M3D) to introduce a simple but important numerical trick to significantly improve the KITTI mAP scores and make a significant change to the KITTI leaderboard. Details can be found in the paper. At the time of the open-source, the paper has not been officially published, and we will keep up with the update of the paper.