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Read May 05, 2009, 06:20:16 am #0
itsmeritesh

Info on Factor graphs

I needed some pointers to some reading material on factor graphs and some reasons on where and why should somebody use factor graphs. Any kind of help is appreciated.


Take a look at my site at http://riteshnayak.com
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Read May 07, 2009, 12:50:43 pm #1
sri

Re: Info on Factor graphs

I needed some pointers to some reading material on factor graphs and some reasons on where and why should somebody use factor graphs. Any kind of help is appreciated.

Er.. what exactly are factor graphs? If you don't know what they are, where and why they should be used, why bother about them in the first place?  Huh
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Read May 07, 2009, 07:51:27 pm #2
sanket

Re: Info on Factor graphs

I am guessing you are talking about some kind of graphical models used in probabilistic inference. As in the graphs that represent factors of a joint probability? Anyway, I believe they are a general structure used in other fields also. But, yes, my immediate reaction was similar to what sri has actually posted. Were you looking for specific applications? Otherwise, there is a lot of general literature available.
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Read May 08, 2009, 09:20:35 am #3
itsmeritesh

Re: Info on Factor graphs

I am trying to build a system which can find relationships between nodes in a graph that are not directly connected. Also, the graph is multipartite.  Its a search problem where, based on the given query, I assign dynamic scores to certain nodes that are part of the result. Along with the dynamic scores, there are static scores that are assigned to each node periodically. So, if I were to do a random walk on the graph, I will have to take in to account the static scores as well. Also, I will have to do these random walks starting from multiple nodes.

 An easy approach would be do a random walk with a seed of (cash * static score) for each node and then use the transition probabilities (in my case marked by edge weights) to distribute the cash and let the algorithm converge. I have read that factor graphs do these things pretty efficiently. General literature has not helped me understand how its different or more efficient. Was hoping I could find some answers here. Sorry for the wrong problem formulation  Smiley

 Given this situation, are there are tricks to make this process better/faster/more relevant? 


Take a look at my site at http://riteshnayak.com
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Read May 08, 2009, 04:30:50 pm #4
sri

Re: Info on Factor graphs

AFAIK, extracting semantics from labeled graphs is very much an open research problem. So don't expect quick answers. Wink
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