Philip Hyunsu Cho 1aaf4a679d
Fix early stopping in the Python package (#4638)
* Fix #4630, #4421: Preserve correct ordering between metrics, and always use last metric for early stopping

* Clarify semantics of early stopping in presence of multiple valid sets and metrics

* Add a test

* Fix lint
2019-07-07 01:01:03 -07:00
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2018-11-15 13:56:33 +13:00
2019-05-27 13:29:28 +12:00