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https://issues.apache.org/jira/browse/SPARK-21633?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joseph K. Bradley resolved SPARK-21633.
---------------------------------------
       Resolution: Fixed
    Fix Version/s: 2.3.0

Issue resolved by pull request 18746
[https://github.com/apache/spark/pull/18746]

> Unary Transformer in Python
> ---------------------------
>
>                 Key: SPARK-21633
>                 URL: https://issues.apache.org/jira/browse/SPARK-21633
>             Project: Spark
>          Issue Type: New Feature
>          Components: ML
>    Affects Versions: 2.2.0
>            Reporter: Ajay Saini
>            Assignee: Ajay Saini
>             Fix For: 2.3.0
>
>
> Currently, the abstract class UnaryTransformer is only implemented in Scala. 
> In order to make Pyspark easier to extend with custom transformers, it would 
> be helpful to have the implementation of UnaryTransformer in Python as well.
> This task involves:
> - implementing the class UnaryTransformer in Python
> - testing the transform() functionality of the class to make sure it works



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