Github user facaiy commented on a diff in the pull request:
    --- 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 */
    -  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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