Github user facaiy commented on a diff in the pull request: https://github.com/apache/spark/pull/18736#discussion_r132618802 --- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/HashingTF.scala --- @@ -80,20 +82,31 @@ class HashingTF @Since("1.4.0") (@Since("1.4.0") override val uid: String) /** @group setParam */ @Since("1.2.0") - def setNumFeatures(value: Int): this.type = set(numFeatures, value) + def setNumFeatures(value: Int): this.type = { + hashingTF = new feature.HashingTF($(numFeatures)).setBinary($(binary)) --- End diff -- @WeichenXu123 How about adding `setNumFeatures` method to mllib?
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