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

    https://github.com/apache/spark/pull/4259#discussion_r29091444
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/ml/regression/LinearRegression.scala ---
    @@ -42,34 +50,122 @@ private[regression] trait LinearRegressionParams 
extends RegressorParams
     class LinearRegression extends Regressor[Vector, LinearRegression, 
LinearRegressionModel]
       with LinearRegressionParams {
     
    -  setDefault(regParam -> 0.1, maxIter -> 100)
    --- End diff --
    
    minor: I think it is okay to leave the defaults here. It is easier for 
users to read. We put some below params because we need to have the params 
defined first.


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