《Spatial Pyramid Pooling in Deep Convolutional Networks for Visual Recognition》
code:https://github.com/ShaoqingRen/SPP_net
https://discuss.pytorch.org/t/what-is-adaptiveavgpool2d/26897
https://blog.csdn.net/xiaosongshine/article/details/89453037
https://github.com/ShaoQiBNU/CV-SPPnet
https://github.com/yueruchen/sppnet-pytorch