Nan Zhu ac30a0aff5 [jvm-packages][spark]Preserve num classes (#2068)
* add back train method but mark as deprecated

* fix scalastyle error

* change class to object in examples

* fix compilation error

* bump spark version to 2.1

* preserve num_class issues

* fix failed test cases

* rivising

* add multi class test
2017-03-04 14:14:31 -08:00
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