Numpy中的广播

简单举例便于回忆

import numpy as np
matrix = np.random.rand(3,4)
cal = matrix.sum(axis = 0)
matrix/cal.reshape(1,4)

>>>
array([[0.14012578, 0.56554582, 0.20182542, 0.38422263],
       [0.36930785, 0.09705178, 0.19575809, 0.02466836],
       [0.49056637, 0.33740239, 0.60241649, 0.59110901]])

广播思想图.png