Hi, Sorry for mistake in my previous email. I meant: According to my observation, the method slows 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 2:39 PM, Piyush Kanti Bhunre <kbpiy...@gmail.com>wrote: > 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
