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

    https://github.com/apache/spark/pull/15394#discussion_r83086848
  
    --- Diff: 
mllib/src/test/scala/org/apache/spark/ml/optim/WeightedLeastSquaresSuite.scala 
---
    @@ -201,11 +476,13 @@ class WeightedLeastSquaresSuite extends SparkFunSuite 
with MLlibTestSparkContext
         for (fitIntercept <- Seq(false, true);
              regParam <- Seq(0.0, 0.1, 1.0);
              standardizeFeatures <- Seq(false, true)) {
    -      val wls = new WeightedLeastSquares(
    -        fitIntercept, regParam, standardizeFeatures, standardizeLabel = 
true)
    -        .fit(instances)
    -      val actual = Vectors.dense(wls.intercept, wls.coefficients(0), 
wls.coefficients(1))
    -      assert(actual ~== expected(idx) absTol 1e-4)
    +      for (solver <- WeightedLeastSquares.supportedSolvers) {
    +        val wls = new WeightedLeastSquares(fitIntercept, regParam, 
elasticNetParam = 0.0,
    +          standardizeFeatures, standardizeLabel = true, solverType = 
solver)
    +          .fit(instances)
    +        val actual = Vectors.dense(wls.intercept, wls.coefficients(0), 
wls.coefficients(1))
    +        assert(actual ~== expected(idx) absTol 1e-4)
    +      }
           idx += 1
         }
       }
    --- End diff --
    
    hm, ya there weren't any before. I wasn't actually sure why we even provide 
the option since we never use it. 


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