[gecode-users] BAB implementation

[Christian Schulte]

A* and how BAB works in Gecode is very different. A* is typically based on representing the problem by states and then coming up with the right operators and functions, etc.

Gecode uses constraint programming which has a very different way of modeling problems. That's why I would suggest to really try a little bit of how models with constraint programming look like. If you want to get an idea on a more high-level you could try a modeling language such as MiniZinc:
	http://www.minizinc.org/

Cheers
Christian	

--
Christian Schulte, https://chschulte.github.io/
Professor of Computer Science, KTH, cschulte at kth.se
Expert Researcher, RISE SICS, christian.schulte at ri.se


-----Original Message-----
From: aqwzsxaqwzsx at orange.fr [mailto:aqwzsxaqwzsx at orange.fr] 
Sent: Tuesday, March 13, 2018 16:06
To: users at gecode.org; Christian Schulte <cschulte at kth.se>
Subject: RE: RE: [gecode-users] BAB implementation

 
Hi,
 
Definitively not a homework. I have to make a technical choice to solve a planification problem with task/resources/scheduling.
A * will be homogeneous with the rest of the software but CSP with a BAB engine seems clearly more appropriate to me.
It has been proved in 1984 by Nau/Kumar/Kanal that A* is a special case of a general BAB formulation and I don't see any reason why it would not be the case with Gecode, but i was asking some advice to decide !
Moreover, i will maybe have some questions about coding rules in gecode relative to embedded system. 

Philippe 


----------------
Le 13/03/2018, à 15:16, "Christian Schulte" <cschulte at kth.se> a écrit :

Hi, I think you will have to do some reading. Smells like homework to me. Christian

--
Christian Schulte, https://chschulte.github.io/ Professor of Computer Science, KTH, cschulte at kth.se Expert Researcher, RISE SICS, christian.schulte at ri.se


-----Original Message-----
From: users-bounces at gecode.org [mailto:users-bounces at gecode.org] On Behalf Of aqwzsxaqwzsx at orange.fr
Sent: Tuesday, March 13, 2018 15:02
To: users at gecode.org
Subject: [gecode-users] BAB implementation

Hi all,
 
This is maybe a general question about the B&B and the A* algorithm, But I was wondering what was the advantage, force, weakness of the Gecode BAB engine over a A*. 

Thanks

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