中文说明：此程序是进行人脸识别时，进行非线性降维后提取特征的一个典型方法，想做非线性降维特征提取的朋友可以研究，本人看后收获颇多
English Description：
This program is a typical method of feature extraction after nonlinear dimensionality reduction in face recognition. Friends who want to do nonlinear dimensionality reduction feature extraction can study it, and I have gained a lot after reading it