Github user sethah commented on a diff in the pull request:
https://github.com/apache/spark/pull/12896#discussion_r62067878
--- Diff: mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala
---
@@ -71,6 +71,22 @@ private[recommendation] trait ALSModelParams extends
Params with HasPredictionCo
/** @group getParam */
def getItemCol: String = $(itemCol)
+
+ /**
+ * Param for strategy for dealing with unknown users or items at
prediction time.
+ * Supported values:
--- End diff --
Should we add a note here about this being useful/necessary when performing
cross validation or evaluating the model on unseen data?
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