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https://issues.apache.org/jira/browse/SPARK-20805?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-20805.
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Resolution: Incomplete
> updated updateP in SVD++ is error
> ----------------------------------
>
> Key: SPARK-20805
> URL: https://issues.apache.org/jira/browse/SPARK-20805
> Project: Spark
> Issue Type: Bug
> Components: GraphX
> Affects Versions: 1.6.1, 2.1.1
> Reporter: BoLing
> Priority: Major
> Labels: bulk-closed
>
> In algorithm svd++, we all known that the usr._2 store the value of pu +
> |N(u)|^(-0.5)*sum(y); the function sendMsgTrainF compute the updated value of
> updateP,updateQ and updateY. At the beginning,the cycle iteration update the
> part of y in usr._2, but pu is never updated. so we should fix the
> sendMessageToSrcFunction in sendMsgTrainF. the old code is
> ctx.sendToSrc((updateP, updateY, (err - conf.gamma6 * usr._3) *
> conf.gamma1)). if we fix like that ctx.sendToSrc((updateP, updateP, (err -
> conf.gamma6 * usr._3) * conf.gamma1)), it maybe arrive the effect we want.
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