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Title: Splittability of bilexical context-free grammars is undecidable
Authors: Nederhof, Mark Jan
Satta, Giorgio
Keywords: Parsing algorithms
Natural language processing
QA75 Electronic computers. Computer science
Issue Date: Dec-2011
Citation: Nederhof , M J & Satta , G 2011 , ' Splittability of bilexical context-free grammars is undecidable ' Computational Linguistics , vol 37 , no. 4 , pp. 867-879 .
Abstract: Bilexical context-free grammars (2-LCFGs) have proved to be accurate models for statistical natural language parsing. Existing dynamic programming algorithms used to parse sentences under these models have running time of O(|w|^4), where w is the input string. A 2-LCFG is splittable if the left arguments of a lexical head are always independent of the right arguments, and vice versa. When a 2-LCFGs is splittable, parsing time can be asymptotically improved to O(|w|^3). Testing this propertyis therefore of central interest to parsing efficiency. In this article, however, we show the negative result that splittability of 2-LCFGs is undecidable.
Version: Publisher PDF
Status: Peer reviewed
URI: http://hdl.handle.net/10023/2415
http://aclweb.org/anthology-new/J/J11/J11-4009.pdf
http://www.mitpressjournals.org/toc/coli/37/4
DOI: http://dx.doi.org/10.1162/COLI_a_00079
ISSN: 0891-2017
Type: Journal article
Rights: (c) 2011 Association for Computational Linguistics
Appears in Collections:University of St Andrews Research
Computer Science Research



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