Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/8591#discussion_r38796584
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/evaluation/RegressionEvaluator.scala
---
@@ -41,6 +41,7 @@ final class RegressionEvaluator(override val uid: String)
* Because we will maximize evaluation value (ref: `CrossValidator`),
* when we evaluate a metric that is needed to minimize (e.g., `"rmse"`,
`"mse"`, `"mae"`),
* we take and output the negative of this metric.
+ * Default: rmse
--- End diff --
Already states default
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