Jiaming Yuan ca3da55de4
Support early stopping with training continuation, correct num boosted rounds. (#6506)
* Implement early stopping with training continuation.

* Add new C API for obtaining boosted rounds.

* Fix off by 1 in `save_best`.

Co-authored-by: Philip Hyunsu Cho <chohyu01@cs.washington.edu>
2020-12-17 19:59:19 +08:00
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