以下程序段中,______不能够实现对数组x按列归一化。import numpy as npx = np.array([[3., 10, 500], [1., 30, 100], [2., 40, 300], [5., 30, 200]])
A.
for i in range(x.shape[1]): x[:,i] = (x[:,i]-x[:,i].min())/(x[:,i].max()-x[:,i].min())
B.
for i in range(x.shape[1]): x[i] = (x[i]-x[i].min())/(x[i].max()-x[i].min())
C.
(x-x.min(axis=0)) / (x.max(axis=0)-x.min(axis=0))
D.
a=(x.max(axis=0)-x.min(axis=0)) (x-x.min(axis=0)) / a