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Posted to issues@spark.apache.org by "Sean Owen (JIRA)" <ji...@apache.org> on 2015/04/20 05:40:58 UTC
[jira] [Commented] (SPARK-7005) resetProb error in pagerank
[ https://issues.apache.org/jira/browse/SPARK-7005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14502302#comment-14502302 ]
Sean Owen commented on SPARK-7005:
----------------------------------
I don't think this is a bug. All it does is mean that the sum of all pageranks equals the number of vertices, not 1. But that's entirely valid too. Right?
> resetProb error in pagerank
> ---------------------------
>
> Key: SPARK-7005
> URL: https://issues.apache.org/jira/browse/SPARK-7005
> Project: Spark
> Issue Type: Bug
> Components: MLlib
> Affects Versions: 1.3.0
> Reporter: lisendong
> Labels: easyfix
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> in the page rank code, the resetProb should be divided by #vertex according to the wikipedia:
> http://en.wikipedia.org/wiki/PageRank
> that is:
> PR[i] = alpha / N + (1 - alpha) * inNbrs[i].map(j => oldPR[j] / outDeg[j]).sum
> but the code is (org.apache.spark.graphx.lib.PageRank)
> PR[i] = alpha + (1 - alpha) * inNbrs[i].map(j => oldPR[j] / outDeg[j]).sum
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