Kodi Arfer f100b8d878 [Breaking] Don't drop trees during DART prediction by default (#5115)
* Simplify DropTrees calling logic

* Add `training` parameter for prediction method.

* [Breaking]: Add `training` to C API.

* Change for R and Python custom objective.

* Correct comment.

Co-authored-by: Philip Hyunsu Cho <chohyu01@cs.washington.edu>
Co-authored-by: Jiaming Yuan <jm.yuan@outlook.com>
2020-01-13 21:48:30 +08:00
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