lisendong created SPARK-7005:
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Summary: 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
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 :
PR[i] = alpha + (1 - alpha) * inNbrs[i].map(j => oldPR[j] / outDeg[j]).sum
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