https://www.letslearnai.com/2018/03/10/what-are-l1-and-l2-loss-functions.html
http://rishy.github.io/ml/2015/07/28/l1-vs-l2-loss/
L1-loss
L2-loss
L1 loss感觉和L1范式差不多,L2 loss相较于L2范式没有开根号,或者说L2 loss就是两个值相减开平方
原文：https://www.cnblogs.com/ymjyqsx/p/9221202.html