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[SPARK-10349] [ML] OneVsRest use 'when ... otherwise' not UDF to gene…
…rate new label at binary reduction Currently OneVsRest use UDF to generate new binary label during training. Considering that [SPARK-7321](https://issues.apache.org/jira/browse/SPARK-7321) has been merged, we can use ```when ... otherwise``` which will be more efficiency. Author: Yanbo Liang <ybliang8@gmail.com> Closes #8519 from yanboliang/spark-10349.
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