使用whiten报错

import numpy as np
from scipy.cluster.vq import vq,kmeans,whiten
list1 = [88.0,74.0,96.0,85.0]

list2 = [92.0,99.0,95.0,94.0]

list3 = [91,0,87.0,99.0,95.0]

list4 = [78.0,99.0,97.0,81.0]

list5 = [88.0,78.0,98.0,84.0]

list6 = [100.0,95.0,100.0,92.0]

data = np.array([list1,list2,list3,list4,list5,list6])
whiten = whiten(data)

报错
ValueError: object arrays are not supported

更改为

data = np.hstack([list1,list2,list3,list4,list5,list6])
whiten = whiten(data)