gridsearchcv中的refit选项是否会重新选择功能？

Question

我正在使用gridsearchcv来训练逻辑回归分类器。我想知道的是，refit命令是否基于选择的超参数C重新选择特征，还是仅使用在交叉验证过程中选择的特征，而仅重新拟合系数的值而无需重新选择特征？ / p>

Answer 1

根据GridSearchCV的文档：

1. Refit an estimator using the best found parameters on the whole dataset.
2. The refitted estimator is made available at the best_estimator_ attribute and permits using predict directly on this GridSearchCV instance.

从这里Confused with repect to working of GridSearchCV，您可以了解到refit参数的重要性。

refit : boolean
    Refit the best estimator with the entire dataset. 
    If “False”, it is impossible to make predictions using 
    this GridSearchCV instance after fitting.