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From "BoLing (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-20805) updated updateP in SVD++ is error
Date Sat, 20 May 2017 05:16:04 GMT

    [ https://issues.apache.org/jira/browse/SPARK-20805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16018329#comment-16018329
] 

BoLing commented on SPARK-20805:
--------------------------------

hi, Sean Owen, you can see this url https://github.com/NewBoLing/GraphSVD-/blob/master/SVDPlusPlus

> 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
>
> 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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