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whole-game: Use the train-val split for NN hp tuning - #5

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bmreiniger wants to merge 1 commit into
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hp_tune_on_val
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bmreiniger wants to merge 1 commit into
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hp_tune_on_val

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@bmreiniger

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Closes #3.

I still prefer the k-fold tuning on train only, but not too strongly.

We don't end up needing it here, but note that with the default refit=True, the grid search object has a new model retrained on its training set, which is train+val from the chapter. So predicting and scoring with that on validation would be a bad idea.

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use validation set in whole game

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