Yun Ni 9004ca03ca [jvm-packages] Saving models into a tmp folder every a few rounds (#2964)
* [jvm-packages] Train Booster from an existing model

* Align Scala API with Java API

* Existing model should not load rabit checkpoint

* Address minor comments

* Implement saving temporary boosters and loading previous booster

* Add more unit tests for loadPrevBooster

* Add params to XGBoostEstimator

* (1) Move repartition out of the temp model saving loop (2) Address CR comments

* Catch a corner case of training next model with fewer rounds

* Address comments

* Refactor newly added methods into TmpBoosterManager

* Add two files which is missing in previous commit

* Rename TmpBooster to checkpoint
2017-12-29 08:36:41 -08:00
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