Jacek Laskowski created SPARK-13998:
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Summary: HashingTF should extend UnaryTransformer
Key: SPARK-13998
URL: https://issues.apache.org/jira/browse/SPARK-13998
Project: Spark
Issue Type: Improvement
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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