[scikit-learn] How GridSearchCV to get best_params?

lampahome pahome.chen at mirlab.org
Thu Jan 3 22:44:44 EST 2019

as title

In the doc it says:

best_params_ : dict
Parameter setting that gave the best results on the hold out data.

My question is what is the hold out data?
It's score of train data or test data, or mean of train and test score?

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