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Topics - MB

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1
General Discussion / reference for Max-Propagation algorithm
« on: July 01, 2010, 20:49:11  »
Can you please provide a reference for the the max-propagation algorithm used by Hugin?
Thank you.

2
General Discussion / LIMID versus UID
« on: June 10, 2010, 02:57:29  »
How does a Limited Memory Influence Diagram differ from an Unconstrained Influence Diagram?

Is there a benefit of working with one over another?  

Thank you.

3
General Discussion / sampling algorithms?
« on: May 05, 2010, 01:59:10  »
Why doesn't Hugin offer sampling-based algorithms for performing inference?  Is there a particular reason only exact inference algorithms (which can be associated with intractably large memory demands) are implemented?
Thank you!

4
I am using a BN containing both continuous and discrete nodes.  I also have a version of the same BN using all discrete nodes (the Gaussian nodes are discretized).   I am using the 64-bit version of Hugin.

When I run the model with both continuous and discrete nodes, I receive an out of memory when memory demands reach ~10.5GB (watching the memory demands in the task manager).  When I use the the BN with strictly discrete nodes, I do not receive an out-of-memory error until Hugin has accessed over 50GB of memory (including virtual memory).

I have decided to make use of continuous nodes to obtain increases in computational efficiency (because we know that the junction tree algorithm is exponential in the size of the largest clique when we use discrete nodes and but cubic when we use continuous nodes).   However, when I saw the reduced performance associated with the hybrid BN, I was puzzled.  Is there any reason I should be seeing the result I described above?  If not, is there any common mistake I may be making?

Thank you for your assistance.

5
HUGIN GUI Discussion / Table import guidance
« on: September 29, 2009, 19:47:37  »
I have generated CPTs using an external program because the build-in table generators take a very long time.  I would like to import to CPTs into Hugin. 
I have saved the files as .txt files however, when I attempt to import the files into Hugin, I receive the following error: "Unable to import table from file. The file contains 0 lines (should be 10) with number of values (big number)"  I am certain the file is not empty and that it contains the correct number of values. 
Is there any guidance available on the format the .txt files should take?  I have tried to export a table and use the same format for the imported file, but with no success.
Any guidance would be greatly appreciated.
Thank you.
-MB

6
General Discussion / Is it possible to allocate more memory?
« on: September 22, 2009, 01:10:30  »
I am working with a 64-bit version of Hugin.  I have been running a few BNs recently and they have been taking a very long time to compile (even after I have found and saved an optimal elimination order).  However, when I look at the Windows task manager, very little of my RAM is being used.  Is there a way  for Hugin to utilize more RAM to reduce computation time in exchange for the calculations using more memory?
Thank you.

7
General Discussion / Propagation
« on: May 13, 2009, 21:35:13  »
Is there are way to have Hugin only perform propagation after evidence has been entered in the BN (instead of computing the unconditional case automatically)?  This is useful when a network becomes computationally simpler/more efficient when certain nodes have been observed. 
Thank you.

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