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https://issues.apache.org/jira/browse/SPARK-5455?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-5455.
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Resolution: Won't Fix
> Add MultipleTransformer abstract class
> --------------------------------------
>
> Key: SPARK-5455
> URL: https://issues.apache.org/jira/browse/SPARK-5455
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 1.2.0
> Reporter: Peter Rudenko
> Priority: Minor
>
> There's an example of UnaryTransformer abstract class. Need to make public
> MultipleTransformer class that would accepts multiple columns as input and
> produce a single output column (e.g. from [col1,col2,col3,...] =>
> Vector(col1,col2, col3,..) or mean([col1,col2,col3,...])).
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