欢迎转载,转载注明出处:html
http://www.cnblogs.com/NeighborhoodGuo/p/4731510.html git
1.详细推导过程:github
2.代码示例htm
万恶的GFW竟然把github的上传端口给封了,因而我就只能用国内的这个山寨版了blog
https://gitcafe.com/NeighborhoodGuo/cs224d-problem-set3.gitget