Opinion Miner

http://www.chioka.in/differences-between-l1-and-l2-as-loss-function-and-regularization/

http://www.csdn.net/article/2015-06-25/2825058-didi

https://github.com/jikeytang/front-end-collect

http://www.csdn.net/article/2015-06-21/2825013

http://blog.sina.com.cn/s/blog_56f7131c0102vmf7.html