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https://issues.apache.org/jira/browse/SPARK-21131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16053032#comment-16053032
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Apache Spark commented on SPARK-21131:
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User 'lxmly' has created a pull request for this issue:
https://github.com/apache/spark/pull/18337
> Fix batch gradient bug in SVDPlusPlus
> -------------------------------------
>
> Key: SPARK-21131
> URL: https://issues.apache.org/jira/browse/SPARK-21131
> 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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