[gecode-users] Dynamic Branching Support?

[Christian Schulte]

Hi Matthias,

Well there is a very simple answer which might be not very satisfying, though: the variable-value based branchings are just some pre-defined abstractions that come with Gecode. In principle you can implement whatever you like, the entire Part B of MPG is devoted to this.

I do not know how much you have been exploring with the pre-defined variable selection strategies. But maybe you want to try ideas such as AFC and using restarts for search first. They sometimes can be remarkably effective.

Cheers
Christian

--
Christian Schulte, www.gecode.org/~schulte 
Professor of Computer Science, KTH, cschulte at kth.se 
Expert Researcher, SICS, cschulte at sics.se

-----Original Message-----
From: users-bounces at gecode.org [mailto:users-bounces at gecode.org] On Behalf Of Matthias Goldhoorn
Sent: Monday, April 13, 2015 04:04 PM
To: users at gecode.org
Subject: [gecode-users] Dynamic Branching Support?

Hi to everyone on the ML,
i'm new to gecode and have already a kind of bug problem .

My Search will not Terminate within days. I have several SetVarArrays, BoolArrays and so on on my Space.
The Solutions they are found are valid for me, but the search is simply to slow (and sometimes to memory exhaustive).
I used already gist for introspection, my problem is that i first branch on a BoolVarArrays which reduces the search space quite well until a spefici point. At this point i would like to keep Post prune the BoolVarArray and Continue branching on a SetVarArray. This wold faster reduce my search space than continue the branching on the Bool one.

My question therefore is: is there a way to select dynamically the branching set?. I found on the documentation that it is possible to select a variable INSIDE a structure for branching. But that i need is a dynamic selection of the Set/Array where the branching should be done. 
Is this possible in gecode. Or (@dev's) is the extension possible?

Best,
Matthias

(P.S. Since i do open-source development i could provide my application if this helps the understanding.)

--
  Dipl.-Inf. Matthias Goldhoorn
  Space and Underwater Robotic

  Universität Bremen
  FB 3 - Mathematik und Informatik
  AG Robotik
  Robert-Hooke-Straße 5
  28359 Bremen, Germany

  Tel.:     +49 421 178 45-4193
  Zentrale: +49 421 178 45-6550
  Fax:      +49 421 178 45-4150
  E-Mail:   matthias.goldhoorn at uni-bremen.de

  Weitere Informationen: http://www.informatik.uni-bremen.de/robotik


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