TAILIEUCHUNG - Báo cáo khoa học: "From Chunks to Function-Argument Structure: A Similarity-Based Approach"

Chunk parsing has focused on the recognition of partial constituent structures at the level of individual chunks. Little attention has been paid to the question of how such partial analyses can be combined into larger structures for complete utterances. Such larger structures are not only desirable for a deeper syntactic analysis. They also constitute a necessary prerequisite for assigning function-argument structure. | From Chunks to Function-Argument Structure A Similarity-Based Approach Sandra Kublerf and Erhard W. Hinrichsf f Seminar fur Sprachwissenschaft University of Tubingen D-72074 Tubingen Germany kuebler eh @ Abstract Chunk parsing has focused on the recognition of partial constituent structures at the level of individual chunks. Little attention has been paid to the question of how such partial analyses can be combined into larger structures for complete utterances. Such larger structures are not only desirable for a deeper syntactic analysis. They also constitute a necessary prerequisite for assigning function-argument structure. The present paper offers a similaritybased algorithm for assigning functional labels such as subject object head complement etc. to complete syntactic structures on the basis of prechunked input. The evaluation of the algorithm has concentrated on measuring the quality of functional labels. It was performed on a German and an English treebank using two different annotation schemes at the level of function-argument structure. The results of correct functional labels for German and for English validate the general approach. 1 Introduction Current research on natural language parsing tends to gravitate toward one of two extremes robust partial parsing with the goal of broad data coverage versus more traditional parsers that aim at complete analysis for a narrowly defined set of data. Chunk parsing Abney 1991 Abney 1996 offers a particularly promising and by now widely used example of the former kind. The main insight that underlies the chunk parsing strategy is to isolate the finite-state analysis of non-recursive syntactic structure . chunks from larger recursive structures. This results in a highly-efficient parsing architecture that is realized as a cascade of finite-state transducers and that pursues a leftmost longest-match patternmatching strategy at each level of analysis. Despite the popularity of

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