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From "Gianmarco De Francisci Morales (JIRA)" <j...@apache.org>
Subject [jira] [Created] (GIRAPH-191) Random Walk with Restart
Date Thu, 17 May 2012 21:09:13 GMT
Gianmarco De Francisci Morales created GIRAPH-191:
-----------------------------------------------------

             Summary: Random Walk with Restart
                 Key: GIRAPH-191
                 URL: https://issues.apache.org/jira/browse/GIRAPH-191
             Project: Giraph
          Issue Type: New Feature
            Reporter: Gianmarco De Francisci Morales


Implementing RWR on Giraph should be a very simple modification of the SimplePageRankVertex
code.

{code}
if ( myID == sourceID )
      DoubleWritable vertexValue = new DoubleWritable((0.15f + 0.85f * sum);
else
      DoubleWritable vertexValue = new DoubleWritable(0.85f * sum);
{code}

It would be nice to make it as configurable as possible by using parametric damping factors,
preference vectors, strongly preferential, etc...
More or less along these lines:
http://law.dsi.unimi.it/software/docs/it/unimi/dsi/law/rank/PageRank.html

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