MLE: maximum likelihood estimate 最大似然估计
OLS: Ordinary Least Squares 普通最小二乘法
LSE: Least Squares Estimate 最小二乘估计
IRLS: Iteratively Reweighted Least Squares 迭代加权最小二乘法
CFS: Closed-form Solution 解析解
MLP: multiple layer perception 多层感知器
原文：http://www.cnblogs.com/littletail/p/5241655.html