Github user jegonzal commented on the pull request:
https://github.com/apache/spark/pull/1217#issuecomment-47193665
I spent some time verifying the math behind the PageRank (in particular
starting values) to ensure that the delta formulation behaves identically to
the static formulation which matches other reference implementations of
PageRank. One of the key changes is I have added an extra normalization step
at the end of the calculation to address a discrepancy in how we handle
dangling vertices.
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