Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/5510#discussion_r28338742
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/tuning/ParamGridBuilderSuite.scala ---
@@ -59,5 +59,9 @@ class ParamGridBuilderSuite extends FunSuite {
(10, "input1"),
(20, "input1"))
validateGrid(maps1, expected1)
+
+ val maps2 = (new ParamGridBuilder()).build()
--- End diff --
Trivial: The initial set of parens isn't needed. I think you can write just
`Set.empty[(Int,String)]` alone?
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