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[jvm-packages] add back libsvm notes (#3232)

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* add back train method but mark as deprecated

* add back train method but mark as deprecated

* fix scalastyle error

* fix scalastyle error

* add back libsvm notes
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Nan Zhu 2018-04-10 09:00:58 -07:00 committed by GitHub
parent 443ff746e9
commit 4109818b32
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jvm-packages/README.md
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@ -20,3 +20,11 @@ You can find more about XGBoost on [Documentation](https://xgboost.readthedocs.o
Full code examples for Scala, Java, Apache Spark, and Apache Flink can
be found in the [examples package](https://github.com/dmlc/xgboost/tree/master/jvm-packages/xgboost4j-example).
**NOTE on LIBSVM Format**:
* Use *1-based* ascending indexes for the LIBSVM format in distributed training mode
* Spark does the internal conversion, and does not accept formats that are 0-based
* Whereas, use *0-based* indexes format when predicting in normal mode - for instance, while using the saved model in the Python package