似然概率https://blog.youkuaiyun.com/u014182497/article/details/82252456
极大似然https://blog.youkuaiyun.com/qq_32742009/article/details/81460815
最大后验概率估计https://blog.youkuaiyun.com/qq_32742009/article/details/81477611
后验和先验https://blog.youkuaiyun.com/qq_23947237/article/details/78265026#fn1
协方差矩阵https://blog.youkuaiyun.com/xiao_lxl/article/details/72730000
EM算法https://blog.youkuaiyun.com/fuqiuai/article/details/79484421
特征工程https://blog.youkuaiyun.com/qq_39521554/article/details/78877505
协方差和相关系数https://www.cnblogs.com/sanshanyin/p/5397091.html