BahaaEddin AlAila created SPARK-20839:
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Summary: Incorrect Dynamic PageRank calculation
Key: SPARK-20839
URL: https://issues.apache.org/jira/browse/SPARK-20839
Project: Spark
Issue Type: Bug
Components: GraphX
Affects Versions: 2.1.1
Reporter: BahaaEddin AlAila
Correct me if I am wrong
I think there are two places where the pagerank calculation is incorrect
1st) in the VertexProgram (line 318 of PageRank.scala in spark 2.1.1)
val newPR = oldPR + (1.0 - resetProb) * msgSum
it should be
val newPR = resetProb + (1.0 - resetProb) * msgSum
2nd) in the message sending part (line 336 of the same file)
Iterator((edge.dstId, edge.srcAttr._2 * edge.attr))
should be
Iterator((edge.dstId, edge.srcAttr._1 * edge.attr))
as we should be sending the edge weight multiplied by the current pagerank of
the source vertex (not the vertex's delta)
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