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Long-distance dependency resolution in automatically acquiredudwide-coverage PCFG-based LFG approximations

机译:自动获取的远程依赖关系解析 ud广泛覆盖的基于pCFG的LFG近似值

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摘要

This paper shows how finite approximations of long distance dependency (LDD) resolution can be obtained automatically for wide-coverage, robust, probabilistic Lexical-Functional Grammar (LFG) resources acquired from treebanks. We extract LFG subcategorisation frames and paths linking LDDudreentrancies from f-structures generated automaticallyudfor the Penn-II treebank trees and use them in an LDD resolution algorithm to parse new text. Unlike (Collins, 1999; Johnson, 2002), in our approach resolution of LDDs is done at f-structure (attribute-value structure representations of basic predicate-argument or dependency structure) without empty productions, traces and coindexation in CFG parse trees. Currently our best automatically induced grammars achieve 80.97% f-score for fstructures parsing section 23 of the WSJ part of theudPenn-II treebank and evaluating against the DCU 1051 and 80.24% against the PARC 700 Dependency Bank (King et al., 2003), performing at the same or a slightly better level than state-of-the-art hand-crafted grammars (Kaplan et al., 2004).
机译:本文展示了如何自动获取从树库中获取的广域,健壮,概率词法功能语法(LFG)资源的长距离依赖(LDD)分辨率的有限近似值。我们从为Penn-II树库树自动 ud生成的f结构中提取链接LDD udreentrancies的LFG子分类框架和路径,并在LDD解析算法中使用它们来解析新文本。与(Collins,1999; Johnson,2002)不同,在我们的方法中,LDD的解析是在f结构(基本谓词参数或依赖结构的属性值结构表示)下完成的,而CFG解析树中没有空产生,痕迹和共索引。目前,对于udPenn-II树库的WSJ部分的第23部分的f结构,我们的最佳自动诱导语法的f得分达到80.97%,对DCU 1051的评估为80.24%(King等人,2003年) ),其性能与目前最先进的手工语法相同或略高(Kaplan等,2004)。

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