Trap escape for local search by backtracking and conflict reverse

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Author(s)
Huu-Phuoc, Duong
Thach-Thao, Duong
Duc, Nghia Pham
Sattar, Abdul
Anh, Duc Duong
Griffith University Author(s)
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Jaeger, M

Nielsen, TD

Viappiani, P

Date
2013
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169338 bytes

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application/pdf

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Aalborg, DENMARK

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Abstract

This paper presents an efficient trap escape strategy in stochastic local search for Satisfiability. The proposed method aims to enhance local search by pro- viding an alternative local minima escaping strategy. Our variable selection scheme provides a novel local minima escaping mechanism to explore new solution areas. Conflict variables are hypothesized as variables recently selected near local min- ima. Hence, a list of backtracked conflict variables is retrieved from local min- ima. The new strategy selects variables in the backtracked variable list based on the clause-weight scoring function and stagnation weights and variable weights as tiebreak criteria. This method is an alternative to the conventional method of se- lecting variables in a randomized unsatisfied clause. The proposed tiebreak method favors high stagnation weights and low variable weights during trap escape phases. The new strategies are examined on verification benchmark and SAT Competi- tion 2011 and 2012 application and crafted instances. Our experiments show that proposed strategy has comparable performance with state-of-the-art local search solvers for SAT.

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TWELFTH SCANDINAVIAN CONFERENCE ON ARTIFICIAL INTELLIGENCE (SCAI 2013)

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257

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© 2013 IOS Press. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the publisher website for access to the definitive, published version.

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Artificial intelligence not elsewhere classified

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