Github user holdenk commented on a diff in the pull request:
https://github.com/apache/spark/pull/12896#discussion_r62086416
--- Diff: python/pyspark/ml/recommendation.py ---
@@ -127,27 +127,31 @@ class ALS(JavaEstimator, HasCheckpointInterval,
HasMaxIter, HasPredictionCol, Ha
"StorageLevel for ALS model factors. " +
"Default: 'MEMORY_AND_DISK'.",
typeConverter=TypeConverters.toString)
+ unknownStrategy = Param(Params._dummy(), "unknownStrategy",
+ "strategy for dealing with unknown users or
items at prediction " +
+ "time. Supported values: 'nan', 'drop'.",
--- End diff --
Mention the default value here
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