TAILIEUCHUNG - Báo cáo khoa học: "Topological Field Parsing of German"

Freer-word-order languages such as German exhibit linguistic phenomena that present unique challenges to traditional CFG parsing. Such phenomena produce discontinuous constituents, which are not naturally modelled by projective phrase structure trees. In this paper, we examine topological field parsing, a shallow form of parsing which identifies the major sections of a sentence in relation to the clausal main verb and the subordinating heads. | Topological Field Parsing of German Jackie Chi Kit Cheung Department of Computer Science University of Toronto Toronto ON M5S 3G4 Canada jcheung@ Gerald Penn Department of Computer Science University of Toronto Toronto ON M5S 3G4 Canada gpenn@ Abstract Freer-word-order languages such as German exhibit linguistic phenomena that present unique challenges to traditional CFG parsing. Such phenomena produce discontinuous constituents which are not naturally modelled by projective phrase structure trees. In this paper we examine topological field parsing a shallow form of parsing which identifies the major sections of a sentence in relation to the clausal main verb and the subordinating heads. We report the results of topological field parsing of German using the unlexicalized latent variable-based Berkeley parser Petrov et al. 2006 Without any language- or model-dependent adaptation we achieve state-of-the-art results on the TuBa-D Z corpus and a modified NE-GRA corpus that has been automatically annotated with topological fields Becker and Frank 2002 . We also perform a qualitative error analysis of the parser output and discuss strategies to further improve the parsing results. 1 Introduction Freer-word-order languages such as German exhibit linguistic phenomena that present unique challenges to traditional CFG parsing. Topic focus ordering and word order constraints that are sensitive to phenomena other than grammatical function produce discontinuous constituents which are not naturally modelled by projective . without crossing branches phrase structure trees. In this paper we examine topological field parsing a shallow form of parsing which identifies the major sections of a sentence in relation to the clausal main verb and subordinating heads when present. We report the results of parsing German using the unlexicalized latent variable-based Berkeley parser Petrov et al. 2006 . Without any language-or model-dependent adaptation we .

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