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

    https://github.com/apache/spark/pull/16344#discussion_r94849501
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/ml/regression/GeneralizedLinearRegression.scala
 ---
    @@ -158,6 +183,16 @@ class GeneralizedLinearRegression @Since("2.0.0") 
(@Since("2.0.0") override val
       setDefault(family -> Gaussian.name)
     
       /**
    +    * Sets the value of param [[variancePower]].
    +    * Used only when family is "tweedie".
    +    *
    +    * @group setParam
    +    */
    +  @Since("2.2.0")
    +  def setVariancePower(value: Double): this.type = set(variancePower, 
value)
    +  setDefault(variancePower -> 1.5)
    --- End diff --
    
    Done. change default variancePower to 0.0, which will use Gaussian (with 
default identity link)


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