Github user imatiach-msft commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16516#discussion_r95848454
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/ml/classification/LogisticRegression.scala
 ---
    @@ -91,8 +91,8 @@ private[classification] trait LogisticRegressionParams 
extends ProbabilisticClas
       @Since("2.1.0")
       final val family: Param[String] = new Param(this, "family",
         "The name of family which is a description of the label distribution 
to be used in the " +
    -      s"model. Supported options: ${supportedFamilyNames.mkString(", ")}.",
    -    ParamValidators.inArray[String](supportedFamilyNames))
    +      s"model (case-insensitive). Supported options: 
${supportedFamilyNames.mkString(", ")}.",
    --- End diff --
    
    maybe we can add an additional string param validators class then to the 
same params.scala file in ml folder?  There should be a generic function and 
the params.scala file seems to be the right place.


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