说明：  用于将高维数据投影到低维子空间上,寻找出反映原高维数据的结构或特征的投影,以达到研究和分析高维数据的目的。
(It can be used to project high-dimensional data onto low-dimensional subspace and find projections that reflect the structure or characteristics of original high-dimensional data, so as to achieve the purpose of research and analysis of high-dimensional data.)