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Posted to issues@spark.apache.org by "yuhao yang (JIRA)" <ji...@apache.org> on 2016/11/02 22:26:58 UTC
[jira] [Commented] (SPARK-18230)
MatrixFactorizationModel.recommendProducts throws NoSuchElement exception
when the user does not exist
[ https://issues.apache.org/jira/browse/SPARK-18230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15630741#comment-15630741 ]
yuhao yang commented on SPARK-18230:
------------------------------------
Perhaps we can use Double.NaN for the case, just to be consistent with spark.ml.als.
[~mikaelstaldal] Do you plan to send a PR for this?
> MatrixFactorizationModel.recommendProducts throws NoSuchElement exception when the user does not exist
> ------------------------------------------------------------------------------------------------------
>
> Key: SPARK-18230
> URL: https://issues.apache.org/jira/browse/SPARK-18230
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Affects Versions: 2.0.1
> Reporter: Mikael Ståldal
> Priority: Minor
>
> When invoking {{MatrixFactorizationModel.recommendProducts(Int, Int)}} with a non-existing user, a {{java.util.NoSuchElementException}} is thrown:
> {code}
> java.util.NoSuchElementException: next on empty iterator
> at scala.collection.Iterator$$anon$2.next(Iterator.scala:39)
> at scala.collection.Iterator$$anon$2.next(Iterator.scala:37)
> at scala.collection.IndexedSeqLike$Elements.next(IndexedSeqLike.scala:63)
> at scala.collection.IterableLike$class.head(IterableLike.scala:107)
> at scala.collection.mutable.WrappedArray.scala$collection$IndexedSeqOptimized$$super$head(WrappedArray.scala:35)
> at scala.collection.IndexedSeqOptimized$class.head(IndexedSeqOptimized.scala:126)
> at scala.collection.mutable.WrappedArray.head(WrappedArray.scala:35)
> at org.apache.spark.mllib.recommendation.MatrixFactorizationModel.recommendProducts(MatrixFactorizationModel.scala:169)
> {code}
> It would be nice if it returned the empty array, or throwed a more specific exception, and that was documented in ScalaDoc for the method.
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