Nan Zhu 5fbe230636
[jvm-packages] documenting tracker (#3831)
* 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

* documenting tracker

* Make it a separate note
2018-10-25 18:53:46 -07:00
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