tailieunhanh - Báo cáo khoa học: "ALGORITHMS FOR GENERATION THEOREM PROVING IN LAMBEK"

We discuss algorithms for generation within the Lambek Theorem Proving Framework. Efficient algorithms for generation in this framework take a semantics-driven strategy. This strategy can be modeled by means of rules in the calculus that are geared to generation, or by means of an algorithm for the Theorem Prover. The latter possibility enables processing of a bidirectional calculus. Therefore Lambek Theorem Proving is a natural candidate for a 'uniform' architecture for natural language parsing and generation. Keywords: generation algorithm; natural language generation; theorem proving; bidirectionality; categorial grammar. introduce a second implementation: a bottom-up algorithm for the theorem prover (4) | ALGORITHMS FOR GENERATION IN LAMBEK THEOREM PROVING Erik-Jan van der Linden Guido Minnen Institute for Language Technology and Artificial Intelligence Tilburg University PO Box 90153 5000 LE Tilburg The Netherlands E-mail vdlinden@ ABSTRACT We discuss algorithms for generation within the Lambek Theorem Proving Framework. Efficient algorithms for generation in this framework take a semantics-driven strategy. This strategy can be modeled by means of rules in the calculus that are geared to generation or by means of an algorithm for the Theorem Prover. The latter possibility enables processing of a bidirectional calculus. Therefore Lambek Theorem Proving is a natural candidate for a uniform1 architecture for natural language parsing and generation. Keywords generation algorithm natural language generation theorem proving bidirectionality categorial grammar. 1 INTRODUCTION Algorithms for tactical generation are becoming an increasingly important subject of research in computational linguistics Shieber 1988 Shieber et al. 1989 Calder et al. 1989 . In this paper we will discuss generation algorithms within the Lambek Theorem Proving LTP framework Moortgat 1988 Lambek 1958 vein Benthem 1986 . In section 2 we give an introduction to a categorial calculus that is extended towards bidirectionality. The naive top-down control strategy in this section does not suit the needs of efficient generation. Next we discuss two ways to implement a semantics-driven strategy. Firstly we add inference rules and cut rules geared to generation to the calculus 3 . Secondly since these changes in the calculus do not support bidirectionality we We would like to thank Gone Bourne Wietake Silts ma and Marianne Sanden tor their comment on an earlier draft of the paper. 220 introduce a second implementation a bottom-up algorithm for the theorem prover 4 . 2 EXTENDING THE CAL- CULUS Natural Language Processing as deduction The architectures in this paper resemble the uniform architecture in .

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