一个很简单的非负矩阵分解算法 可用于特征降维等 采用了最基础的判断准则 非常容易理解 只适用于初学者理解 算法步骤-A very simple non-negative matrix factorization algorithm can be used for feature dimensionality reduction, etc. using the most basic criterion applies only to a very easy to understand for be