Hadamard product

按元素乘积。

python中Hadamard product和matrix product的区分：

For numpy.ndarray objects, * performs elementwise multiplication, and matrix multiplication must use a function call (numpy.dot). For numpy.matrix objects, * performs matrix multiplication, and elementwise multiplication requires function syntax.

也就是说，当变量类型为 numpy.ndarray 时，∗表示的是Hadamard product；当变量类型为 numpy.matrix 时，∗表示的是matrix product。

https://blog.csdn.net/Flying_sfeng/article/details/79330336

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