[jira] [Commented] (SPARK-19345) Add doc for "coldStartStrategy" usage in ALS

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-19345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15888579#comment-15888579 ] 

Apache Spark commented on SPARK-19345:
--------------------------------------

User 'MLnick' has created a pull request for this issue:
https://github.com/apache/spark/pull/17102

> Add doc for "coldStartStrategy" usage in ALS
> --------------------------------------------
>
>                 Key: SPARK-19345
>                 URL: https://issues.apache.org/jira/browse/SPARK-19345
>             Project: Spark
>          Issue Type: Documentation
>          Components: ML
>            Reporter: Nick Pentreath
>            Assignee: Nick Pentreath
>
> SPARK-14489 adds the ability to skip {{NaN}} predictions during {{ALS.transform}}. This can be useful in production scenarios but is particularly useful when trying to use the cross-validation classes with ALS, since in many cases the test set will have users/items that are not in the training set, leading to evaluation metrics that are all {{NaN}} and making cross-validation unusable.
> Add an explanation for the {{coldStartStrategy}} param to the ALS documentation, and add example code to illustrate the usage.



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org