Github user hhbyyh commented on a diff in the pull request:
https://github.com/apache/spark/pull/19993#discussion_r157870176
--- Diff: mllib/src/main/scala/org/apache/spark/ml/param/params.scala ---
@@ -249,6 +250,29 @@ object ParamValidators {
def arrayLengthGt[T](lowerBound: Double): Array[T] => Boolean = {
(value: Array[T]) =>
value.length > lowerBound
}
+
+ /**
+ * Checks that either inputCols and outputCols are set or inputCol and
outputCol are set. If
+ * this is not true, an `IllegalArgumentException` is raised.
+ * @param model
+ */
+ def assertColOrCols(model: Params): Unit = {
--- End diff --
private[spark]
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