Jiaming Yuan 2cc9662005
Support slicing tree model (#6302)
This PR is meant the end the confusion around best_ntree_limit and unify model slicing. We have multi-class and random forests, asking users to understand how to set ntree_limit is difficult and error prone.

* Implement the save_best option in early stopping.

Co-authored-by: Philip Hyunsu Cho <chohyu01@cs.washington.edu>
2020-11-02 23:27:39 -08:00
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2020-10-19 12:02:36 +08:00