http://www.csuldw.com/2016/03/26/2016-03-26-loss-function/ https://github.com/JohnLangford/vowpal_wabbit/wiki/Loss-functions http://kubicode.me/2016/04/11/Machine%20Learning/Say-About-Loss-Function/

https://www.zhihu.com/question/59797824

https://zhuanlan.zhihu.com/p/27748177