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https://issues.apache.org/jira/browse/SPARK-7005?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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lisendong updated SPARK-7005:
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Comment: was deleted
(was: oh...you are right...
I'm so sorry, the result is exactly being scaled by N...
)
> 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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