Github user jkbradley commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16017#discussion_r89694871
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/ml/classification/DecisionTreeClassifier.scala
 ---
    @@ -52,33 +52,49 @@ class DecisionTreeClassifier @Since("1.4.0") (
     
       // Override parameter setters from parent trait for Java API 
compatibility.
     
    +  /** @group setParam */
       @Since("1.4.0")
    -  override def setMaxDepth(value: Int): this.type = 
super.setMaxDepth(value)
    +  override def setMaxDepth(value: Int): this.type = set(maxDepth, value)
    --- End diff --
    
    Do you need to change this?  I'd prefer the former, in case some special 
logic is ever added to super.setMaxDepth.
    
    Same elsewhere


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