ResNet
https://blog.csdn.net/quincuntial/article/details/77263562
https://www.cv-foundation.org/openaccess/content_cvpr_2016/papers/He_Deep_Residual_Learning_CVPR_2016_paper.pdf
DenseNet
https://calmdownandcarryon.github.io/2017/10/06/paper-reading/cvpr_densenet/
http://openaccess.thecvf.com/content_cvpr_2017/papers/Huang_Densely_Connected_Convolutional_CVPR_2017_paper.pdf