中文说明：一种很重要的非监督降维方法，是流形学习算法Laplacian Eigenmap 的线性化方法，在人脸识别中效果非常好。
English Description：
One of the most important unsupervised dimensionality reduction methods is the linearization method of manifold learning algorithm Laplacian Eigenmap, which is very effective in face recognition.