https://www.leiphone.com/news/201705/4CFBFH5szAubNQiK.html
https://www.jianshu.com/p/b1000d5345bb
https://www.jb51.net/article/145180.htm
CNN\RNN\DNN区别：
https://blog.csdn.net/lff1208/article/details/77717149
https://www.cnblogs.com/LHWorldBlog/p/9581918.html
