Problem:
问题：
The input is a (i,j)-matrix M. The desired output is a (i^n,j^n) matrix K , where n is the number of products taken. The verbose way to get the desired output is as followsThe input is a (i,j)-matrix M
阅读背景：
Numpy / Python：高效矩阵作为输入矩阵的笛卡尔积的乘法
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