该矩阵为稀疏矩阵，将该矩阵用三元组法来进行表示。

This URL-URL matrix is a sparse matrix which can be represented by List of 3-tuples.

youdao

该矩阵为稀疏矩阵，将该矩阵用三元组法来进行表示。

This URL-URL matrix is a sparse matrix which can be represented by List of 3-tuples.

youdao