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Posted to issues@spark.apache.org by "ruiqiangfan (JIRA)" <ji...@apache.org> on 2017/06/18 00:31:00 UTC

[jira] [Closed] (SPARK-21130) Fix batch gradient bug in SVDPlusPlus

     [ https://issues.apache.org/jira/browse/SPARK-21130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ruiqiangfan closed SPARK-21130.
-------------------------------
    Resolution: Duplicate

> Fix batch gradient bug in SVDPlusPlus
> -------------------------------------
>
>                 Key: SPARK-21130
>                 URL: https://issues.apache.org/jira/browse/SPARK-21130
>             Project: Spark
>          Issue Type: Bug
>          Components: GraphX
>    Affects Versions: 2.1.1
>            Reporter: ruiqiangfan
>
> I think the mode of batch gradient in Graphx SVDPlusPlus is incorrect. The changes of this pull request are as blow:
> * Use the mean of batch gradient instead of the sum of batch gradient.
> * When calculating the bias of each rating during iteration,  the bias shouldn't be limit in (minVal, maxVal).
> * The method "calculateIterationRMSE" is added to show the iteration effect clearly.



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