TAILIEUCHUNG - Báo cáo khoa học: "Preserving Semantic Dependencies in Synchronous Tree Adjoining Grammar*"

Rambow, Wier and Vijay-Shanker (Rainbow et al., 1995) point out the differences between TAG derivation structures and semantic or predicateargument dependencies, and Joshi and VijayShanker (Joshi and Vijay-Shanker, 1999) describe a monotonic compositional semantics based on attachment order that represents the desired dependencies of a derivation without underspecifying predicate-argument relationships at any stage. | Preserving Semantic Dependencies in Synchronous Tree Adjoining Grammar William Schuler University of Pennsylvania 200 South 33rd Street Philadelphia PA 19104 USA schuler@ Abstract Rambow Wier and Vijay-Shanker Rambow et al. 1995 point out the differences between TAG derivation structures and semantic or predicateargument dependencies and Joshi and Vijay-Shanker Joshi and Vijay-Shanker 1999 describe a monotonic compositional semantics based on attachment order that represents the desired dependencies of a derivation without underspecifying predicate-argument relationships at any stage. In this paper we apply the Joshi and Vijay-Shanker conception of compositional semantics to the problem of preserving semantic dependencies in Synchronous TAG translation Shieber and Schabes 1990 Abeillé et al. 1990 . In particular we describe an algorithm to obtain the semantic dependencies on a TAG parse forest and construct a target derivation forest with isomorphic or locally non-isomorphic dependencies in ơ n7 time. 1 Introduction The primary goal of this paper is to solve the problem of preserving semantic dependencies in Isomorphic Synchronous Tree Adjoining Grammar ISTAG Shieber 1994 Shieber and Schabes 1990 a variant of Tree Adjoining Grammar Joshi 1985 in which source and target elementary trees are assembled into isomorphic derivations. The problem first described in Rambow Wier and Vijay-Shanker Rambow et al. 1995 stems from the fact that the TAG derivation structure - even using a flat adjunction of modifiers Schabes and Shieber 1994 - deviates from the appropriate dependency The author would like to thank Karin Kipper Aravind Joshi Martha Palmer Norm Badler and the anonymous reviewers for their valuable comments. This work was partially supported by NSF Grant SBR8920230 and ARO Grant DAAH0404-94-GE-0426. structure in certain cases. This can result in translation errors. For example if we parse sentence 1 1 X is supposed to be able to fly. using the .

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