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-This procedure is carried out face recognition, the non-linear dimensionality reduction after the extraction of the characteristics of a typical method to do non-linear dimensionality reduct