Resnet
https://www.jianshu.com/p/dbab6a116c96
http://blog.csdn.net/u013698770/article/details/57977482
http://blog.csdn.net/u013709270/article/details/78838875
http://blog.csdn.net/qq_21190081/article/details/75933329
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Densenet
https://zhuanlan.zhihu.com/p/32989555
http://blog.csdn.net/xjz18298268521/article/details/79078337