Nan Zhu 65db8d0626
[jvm-packages] support spark 2.4 and compatibility test with previous xgboost version (#4377)
* bump spark version

* keep float.nan

* handle brokenly changed name/value

* add test

* add model files

* add model files

* update doc
2019-04-17 11:33:13 -07:00
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