sklearn错误：ModuleNotFoundError: No module named 'sklearn.cross_validation

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在导入KFold,train_test_split的时候报错：ModuleNotFoundError: No module named 'sklearn.cross_validation

原因分析：老版本的sklearn按照下面方式导入的时候，容易报错：

from sklearn.cross_validation import KFold
from sklearn.cross_validation import train_test_split

新的导入方式：

from sklearn.model_selection import KFold
from sklearn.model_selection import train_test_split