shuffle的作用是打乱参数的顺序
[0, 1, 2, ..., N] -> [55, 4, 84, ..., N]
目前接触到shuffle有三个package
1. random
import random
random.shuffle(a) # 直接修改a
2. numpy.random.shuffle
import numpy as np
np.random.shuffle(a)# 直接修改a
3. sklearn.utils.shuffle
from sklearn.utils import shuffle
b = shuffle(a)# a不变，修改结果赋值b
