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

    https://github.com/apache/spark/pull/12491#discussion_r60173022
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/ml/classification/LogisticRegression.scala
 ---
    @@ -159,7 +159,9 @@ private[classification] trait LogisticRegressionParams 
extends ProbabilisticClas
     @Since("1.2.0")
     @Experimental
     class LogisticRegression @Since("1.2.0") (
    -    @Since("1.4.0") override val uid: String)
    +    @Since("1.4.0") override val uid: String,
    +    @Since("2.0.0") val numFeatures: Int = 0,
    --- End diff --
    
    Why are we adding these vals here? Where do they get set from? Are they 
needed?


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