Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 431548
Title Partial Symmetry Breaking by Local Search in the Group
Author(s) Prestwich, S.; Hnich, B.; Simonis, H.; Rossi, R.; Tarim, S.A.
Source Constraints 17 (2012)2. - ISSN 1383-7133 - p. 148 - 171.
Department(s) WASS
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) constraint satisfaction - lex
Abstract The presence of symmetry in constraint satisfaction problems can cause a great deal of wasted search effort, and several methods for breaking symmetries have been reported. In this paper we describe a new method called Symmetry Breaking by Nonstationary Optimisation, which interleaves local search in the symmetry group with backtrack search on the constraint problem. It can be tuned to break each symmetry with an arbitrarily high probability with high runtime overhead, or as a lightweight but still powerful method with low runtime overhead. It has negligible memory requirement, it combines well with static lex-leader constraints, and its benefit increases with problem hardness.
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