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Posted to issues@spark.apache.org by "zhengruifeng (JIRA)" <ji...@apache.org> on 2018/11/09 09:09:01 UTC

[jira] [Resolved] (SPARK-22737) Simplity OneVsRest transform

     [ https://issues.apache.org/jira/browse/SPARK-22737?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

zhengruifeng resolved SPARK-22737.
----------------------------------
    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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