Github user WeichenXu123 commented on a diff in the pull request:
https://github.com/apache/spark/pull/20146#discussion_r161040131
--- Diff: mllib/src/main/scala/org/apache/spark/ml/param/params.scala ---
@@ -249,6 +249,16 @@ object ParamValidators {
def arrayLengthGt[T](lowerBound: Double): Array[T] => Boolean = {
(value: Array[T]) =>
value.length > lowerBound
}
+
+ /** Check if more than one param in a set of exclusive params are set. */
+ def checkExclusiveParams(model: Params, params: String*): Unit = {
--- End diff --
@hhbyyh Is this the common helper methods you want for checking in/out
single/multiple columns ?
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