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https://issues.apache.org/jira/browse/SPARK-13998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15211935#comment-15211935
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Jacek Laskowski commented on SPARK-13998:
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[~mlnick] It's a simple refactoring, i.e. changing {{extends Transformer with
HasInputCol with HasOutputCol}} to {{extends UnaryTransformer[...]}} Is your
moving the issue as a subtask a nod to the change? (I'm concerned after having
read the other comment from [~yanboliang] and the follow-up from [~josephkb])
> HashingTF should extend UnaryTransformer
> ----------------------------------------
>
> Key: SPARK-13998
> URL: https://issues.apache.org/jira/browse/SPARK-13998
> Project: Spark
> Issue Type: Sub-task
> Components: ML
> Affects Versions: 2.0.0
> Reporter: Jacek Laskowski
> Priority: Minor
>
> Currently
> [HashingTF|https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/ml/feature/HashingTF.scala#L37]
> extends {{Transformer with HasInputCol with HasOutputCol}}, but there is a
> helper
> [UnaryTransformer|https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/ml/Transformer.scala#L79-L80]
> abstract class for exactly the reason.
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