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Generation and poly...
Generation and polynomial parsing of graph languages with non-structural reentrancies
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- Björklund, Johanna, 1961- (författare)
- Umeå universitet,Institutionen för datavetenskap,Foundations of Language Processing
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- Drewes, Frank (författare)
- Umeå universitet,Institutionen för datavetenskap,Foundations of Language Processing
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- Jonsson, Anna, 1992- (författare)
- Umeå universitet,Institutionen för datavetenskap,Foundations of Language Processing
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(creator_code:org_t)
- Association for Computational Linguistics, 2023
- 2023
- Engelska.
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Ingår i: Computational linguistics - Association for Computational Linguistics (Print). - : Association for Computational Linguistics. - 0891-2017 .- 1530-9312. ; 49:4, s. 841-882
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Abstract
Ämnesord
Stäng
- Graph-based semantic representations are popular in natural language processing (NLP), where it is often convenient to model linguistic concepts as nodes and relations as edges between them. Several attempts have been made to find a generative device that is sufficiently powerful to describe languages of semantic graphs, while at the same allowing efficient parsing. We contribute to this line of work by introducing graph extension grammar, a variant of the contextual hyperedge replacement grammars proposed by Hoffmann et al. Contextual hyperedge replacement can generate graphs with non-structural reentrancies, a type of node-sharing that is very common in formalisms such as abstract meaning representation, but which context-free types of graph grammars cannot model. To provide our formalism with a way to place reentrancies in a linguistically meaningful way, we endow rules with logical formulas in counting monadic second-order logic. We then present a parsing algorithm and show as our main result that this algorithm runs in polynomial time on graph languages generated by a subclass of our grammars, the so-called local graph extension grammars.
Ämnesord
- NATURVETENSKAP -- Data- och informationsvetenskap -- Språkteknologi (hsv//swe)
- NATURAL SCIENCES -- Computer and Information Sciences -- Language Technology (hsv//eng)
Nyckelord
- Graph grammar
- semantic graph
- meaning representation
- graph parsing
- Computer Science
- datalogi
- computational linguistics
- datorlingvistik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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