无法从版本> 0.20的sklearn导入cross_validation [重复]

Question

当我从sklearn 导入cross_validation 时：

from sklearn import cross_validation

我收到以下错误：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name 'cross_validation' from 'sklearn' (/root/anaconda3/lib/python3.7/site-packages/sklearn/__init__.py)

Answer 1

你必须把它称为

from sklearn.model_selection import cross_validate

如果你想做train test splitting，你需要提供以下信息

from sklearn.model_selection import train_test_split
a_train, a_test, b_train, b_test = train_test_split(a, b, 
                                         test_size=0.33, random_state=42)

sklearn 中的交叉验证训练测试拆分已弃用

from sklearn.cross_validation import train_test_split

Deprecated since version 0.18: This module will be removed in 0.20. Use sklearn.model_selection.train_test_split instead