Hi, I was getting some negative values due to some wrong and insufficient number of relationships between nodes supplied to the algorithms. Now I am getting expected result after fixing it. According to my observation, the method show down if (i) the number of nodes and relationships is large, and (ii) the node and/or relationships have many property fields.
Thanks, Piyush On Wed, Nov 10, 2010 at 4:30 AM, Paul A. Jackson <paul.jack...@pb.com>wrote: > Not sure if this fell through the cracks. > > Here are some more specific questions. > > I get inconsistent results from run to run using eigenvector centrality. > It doesn't seem to matter which implementation I use but I have used > Arnoldi most, for no reason other than it returns the iteration count. > > The iteration count is not consistent from run to run when run against the > exact same graph using the exact same precision. In a graph with 32 nodes > and 117 edges, I get anywhere from 18 to 24 iterations needed to get a > precision of 0.001. The variance is easier to see when the test is run on > different computers. > > Also, I experience the same problem as Piyush below. Not sure if anything > ever came from this: > > On Wed, Jul 28, 2010 at 10:20 AM, Piyush Kanti Bhunre <kbpiy...@gmail.com> > wrote: > > Hi, > > > > I am getting some negative values of centrality of nodes of a > > network using Neo4j's EigenvectorCentralityArnoldi. I am using this > > for the small networks having few thousands nodes. I am not sure if it > > is due to instability of the algorithm or bugs in implementation. > > Could you please comment on that? > > > > Thanks. > > Piyush > > Thanks, > -Paul > > > -----Original Message----- > From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] > On Behalf Of Paul A. Jackson > Sent: Monday, November 08, 2010 10:10 AM > To: Neo4j user discussions > Subject: [Neo4j] Eigenvector Centrality subclasses > > Anyone know the pros/cons of the Arnoldi eigenvector centrality > implementation over the Power implementation? I see that Arnoldi gives a > little more information on number of iterations, but it seems neither is > deterministic. > > Thanks, > Paul Jackson > Pitney Bowes > _______________________________________________ > Neo4j mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user > > _______________________________________________ > Neo4j mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user > _______________________________________________ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
