Github user holdenk commented on a diff in the pull request:
https://github.com/apache/spark/pull/12896#discussion_r62889428
--- Diff: mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala
---
@@ -71,6 +71,26 @@ private[recommendation] trait ALSModelParams extends
Params with HasPredictionCo
/** @group getParam */
def getItemCol: String = $(itemCol)
+
+ /**
+ * Param for strategy for dealing with unknown or new users/items at
prediction time.
+ * This may be useful in cross-validation or production scenarios, for
handling user/item ids
+ * the model has not seen in the training data.
+ * Supported values:
+ * - "nan": predicted value for unknown ids will be NaN.
--- End diff --
Any reason why "nan" rather than "NaN"?
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