Github user sethah commented on a diff in the pull request:
https://github.com/apache/spark/pull/12896#discussion_r62198643
--- 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:
+ * - "nan": prediction value for unknown ids will be NaN.
+ * - "drop": rows in the input DataFrame containing unknown ids will be
dropped.
+ * Default: "nan".
+ * @group expertParam
+ */
+ val unknownStrategy = new Param[String](this, "unknownStrategy",
--- End diff --
@MLnick I think it's good. It's an "expert" param anyway. Also, it's better
in a way because it's hard to _assume_ what it means. For those that don't know
it, they can check out the doc.
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