The decomposed left matrix of Non-negative Matrix Factorization (NMF) is required to be full column rank, which limits of its application to Underdetermined Blind Source Separation (UBSS).

非负矩阵分解（NMF）要求分解得到的左矩阵为列满秩，这限制了它在欠定盲分离（UBSS）中的应用。

youdao

It is usually required that the design matrix is column full rank in applying recursive weighted least squares algorithm.

通常在使用递推加权最小二乘算法时，需要设计矩阵列满秩。

youdao