[英]How to multiply a vector by an array/matrix element-wise in numpy?
I have a multidimensional array a
whose shape is (32,3,5,5) and an array v
with a shape of (32,).我有一个形状为 (32,3,5,5) 的多维数组a
和一个形状为 (32,) 的数组v
。 How could I multiply (i,3,5,5) with (i,) for each i using numpy other than a for-loop?对于除 for 循环之外的每个 i,我如何使用 numpy 将 (i,3,5,5) 与 (i,) 相乘?
With a
and v
as the two arrays, few approaches could be suggested -使用a
和v
作为两个数组,可以建议几种方法 -
a*v[:,None,None,None]
a*v.reshape(-1, *[1]*3)
(a.T * v).T
np.einsum('i...,i->i...', a, v)
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