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

    https://github.com/apache/spark/pull/3833#discussion_r23954974
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/mllib/regression/GeneralizedLinearAlgorithm.scala
 ---
    @@ -107,6 +124,12 @@ abstract class GeneralizedLinearAlgorithm[M <: 
GeneralizedLinearModel]
       private var useFeatureScaling = false
     
       /**
    +   * The dimension of training features.
    +   */
    +  protected var numFeatures: Int = 0
    +
    +
    --- End diff --
    
    remove extra empty line


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