强迫sklearn交叉val分数使用分层k折？

Question

https://scikit-learn.org/stable/modules/generated/sklearn.model_selection.cross_val_score.html#sklearn.model_selection.cross_val_score

是否可以强制使用分层k折？我怎么知道使用过k折？

Answer 1

使用此：

 cross_val_score(estimator, X, y, cv=YOURCHOICE)

示例：

from sklearn import datasets, linear_model
from sklearn.model_selection import cross_val_score
diabetes = datasets.load_diabetes()
from sklearn.model_selection import StratifiedKFold

X = diabetes.data[:150]
y = diabetes.target[:150]
lasso = linear_model.Lasso()

skf = StratifiedKFold(n_splits=2)
results = cross_val_score(lasso, X, y, cv=skf)