[jira] [Commented] (SPARK-4303) [MLLIB] Use "Long" IDs instead of "Int" in ALS.Rating class

["Matei Zaharia (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-4303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14203147#comment-14203147 ] 

Matei Zaharia commented on SPARK-4303:
--------------------------------------

Yup, this will actually become easier with the new pipeline API, but it's probably not going to happen in 1.2.

> [MLLIB] Use "Long" IDs instead of "Int" in ALS.Rating class
> -----------------------------------------------------------
>
>                 Key: SPARK-4303
>                 URL: https://issues.apache.org/jira/browse/SPARK-4303
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>            Reporter: Jia Xu
>
> In many big data recommendation applications, the IDs used for "users" and "products" are usually Long type instead of Integer. 
> So a Rating class based on Long IDs should be more useful for these applications.
> i.e. case class Rating(val user: Long, val product: Long, val rating: Double)



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