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Constraint Grammar as a SAT problem

Inari Listenmaa
Chalmers University of Technology, Gothenburg, Sweden

Koen Clæssen
Chalmers University of Technology, Gothenburg, Sweden

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Ingår i: Proceedings of the Workshop on “Constraint Grammar - methods, tools and applications” at NODALIDA 2015, May 11-13, 2015, Institute of the Lithuanian Language, Vilnius, Lithuania

Linköping Electronic Conference Proceedings 113:4, s. 23-27

NEALT Proceedings Series 24:4, s. 23-27

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Publicerad: 2015-06-17

ISBN: 978-91-7519-037-2

ISSN: 1650-3686 (tryckt), 1650-3740 (online)

Abstract

We represent Constraint Grammar (CG) as a Boolean satisfiability (SAT) problem. Encoding CG in logic brings some new features to the grammars. The rules are interpreted in a more declarative way, which makes it possible to abstract away from details such as cautious context and ordering. A rule is allowed to affect its context words, which makes the number of the rules in a grammar potentially smaller. Ordering can be preserved or discarded; in the latter case, we solve eventual rule conflicts by finding a solution that discards the least number of rule applications. We test our implementation by parsing texts in the order of 10,000s–100,000s words, using grammars with hundreds of rules.

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