python 实现lda
https://blog.csdn.net/z962013489/article/details/79871789
https://github.com/liupei101/MLIA/blob/master/Ch0X_DimensionalityReduction/LDA.py
https://blog.csdn.net/weixin_40604987/article/details/79615968
-------------------------------------------------------------逆水行舟,不进则退。