Nan Zhu aa48b7e903
[jvm-packages][refactor] refactor XGBoost.scala (spark) (#3904)
* add back train method but mark as deprecated

* add back train method but mark as deprecated

* add back train method but mark as deprecated

* add back train method but mark as deprecated

* fix scalastyle error

* fix scalastyle error

* fix scalastyle error

* fix scalastyle error

* wrap iterators

* remove unused code

* refactor

* fix typo
2018-11-15 20:38:28 -08:00
..
2018-11-04 05:49:11 -08:00