交叉验证问题 [英] Issue with Cross Validation

问题描述

我想使用留一法交叉验证。但是我遇到了以下错误：

I want to use leave one out cross validation. But i am getting below error:

AttributeError                            Traceback (most recent call last)
<ipython-input-19-f15f1e522706> in <module>()
      3 loo = LeaveOneOut(num_of_examples)
      4 #loo.get_n_splits(X_train_std)
----> 5 for train, test in loo.split(X_train_std):
      6     print("%s %s" % (train, test))

AttributeError： LeaveOneOut对象没有属性 split

AttributeError: 'LeaveOneOut' object has no attribute 'split'

详细代码如下：

from sklearn.cross_validation import train_test_split
X_train, X_test, y_train, y_test = 
train_test_split(X, y, test_size=0.3, random_state=0)

from sklearn.preprocessing import StandardScaler
sc = StandardScaler()
sc.fit(X_train)
X_train_std = sc.transform(X_train)
X_test_std = sc.transform(X_test)

from sklearn.cross_validation import LeaveOneOut
num_of_examples = len(X_train_std)
loo = LeaveOneOut(num_of_examples)
for train, test in loo.split(X_train_std):
print("%s %s" % (train, test))

推荐答案

使用

from sklearn.model_selection import train_test_split

而不是cross_validation，因为将cross_validation更改为model_selction

rather than cross_validation because cross_validation in changed into model_selction

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