Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/3459#discussion_r20901060
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/recommendation/MatrixFactorizationModel.scala
---
@@ -28,13 +28,16 @@ import org.apache.spark.rdd.RDD
/**
* Model representing the result of matrix factorization.
*
+ * NB: If you create the model directly using constructor, please be aware
that fast prediction
+ * requires cached user/product features and the availability of their
partitioning information.
--- End diff --
It might be good to explain what "availability" means.
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