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https://issues.apache.org/jira/browse/SPARK-22737?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhengruifeng resolved SPARK-22737.
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Resolution: Not A Problem
> Simplity OneVsRest transform
> ----------------------------
>
> Key: SPARK-22737
> URL: https://issues.apache.org/jira/browse/SPARK-22737
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 2.3.0
> Reporter: zhengruifeng
> Priority: Major
>
> Current impl of OneVsRest#transform is over-complicated. It sequentially
> updates an acumulated column.
> By using a direct UDF of prediction, we obtain a speedup of at least 2x.
> On some extreme case with 20 classes, it obtain about 14x speedup.
> The test code and performance comparsion details are in the corresponding PR.
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