转载：https://blog.csdn.net/mvpboss1004/article/details/79188190
pandas中的get_dummies得到的one-hot编码数据类型是uint8，进行数值计算时会溢出！！！
import pandas as pd import numpy as np a = [1, 2, 3, 1] one_hot = pd.get_dummies(a) print(one_hot.dtypes) print(one_hot) print(-one_hot)
1 uint8
2 uint8
3 uint8
dtype: object
1 2 3
0 1 0 0
1 0 1 0
2 0 0 1
3 1 0 0
1 2 3
0 255 0 0
1 0 255 0
2 0 0 255
3 255 0 0
one_hot = one_hot.astype('float') print(-one_hot)
1 2 3
0 -1.0 -0.0 -0.0
1 -0.0 -1.0 -0.0
2 -0.0 -0.0 -1.0
3 -1.0 -0.0 -0.0
