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Dependency-based n-gram models for general purpose sentence realisation

Published online by Cambridge University Press:  29 November 2010

YUQING GUO ,
HAIFENG WANG  and
JOSEF VAN GENABITH
YUQING GUO
Affiliation:
Toshiba (China) Research and Development Center 5/F., Tower W2, Oriental Plaza, Dongcheng District, Beijing, 100738, China e-mail: [email protected]
HAIFENG WANG
Affiliation:
Baidu, Inc., Baidu Campus, No. 10, Shangdi 10th Street, Haidian District, Beijing, 100085, China e-mail: [email protected]
JOSEF VAN GENABITH
Affiliation:
NCLT/CNGL, School of Computing, Dublin City University Glasnevin, Dublin 9, Ireland e-mail: [email protected]
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Abstract

This paper presents a general-purpose, wide-coverage, probabilistic sentence generator based on dependency n-gram models. This is particularly interesting as many semantic or abstract syntactic input specifications for sentence realisation can be represented as labelled bi-lexical dependencies or typed predicate-argument structures. Our generation method captures the mapping between semantic representations and surface forms by linearising a set of dependencies directly, rather than via the application of grammar rules as in more traditional chart-style or unification-based generators. In contrast to conventional n-gram language models over surface word forms, we exploit structural information and various linguistic features inherent in the dependency representations to constrain the generation space and improve the generation quality. A series of experiments shows that dependency-based n-gram models generalise well to different languages (English and Chinese) and representations (LFG and CoNLL). Compared with state-of-the-art generation systems, our general-purpose sentence realiser is highly competitive with the added advantages of being simple, fast, robust and accurate.

Type
Articles
Information
Natural Language Engineering , Volume 17 , Issue 4 , October 2011 , pp. 455 - 483
Copyright
Copyright © Cambridge University Press 2010

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