Point-GNN: Graph Neural Network for 3D Object Detection in a Point Cloud, CVPR 2020. http://openaccess.thecvf.com/content_CVPR_2020/papers/Shi_Point-GNN_Graph_Neural_Network_for_3D_Object_Detection_in_a_CVPR_2020_paper.pdf 代码原地址:https://github.com/WeijingShi/Point-GNN