Dependency Parsing Schemata and Mildly Non-Projective Dependency Parsing
نویسندگان
چکیده
منابع مشابه
Dependency Parsing Schemata and Mildly Non-Projective Dependency Parsing
We introduce dependency parsing schemata, a formal framework based on Sikkel’s parsing schemata for constituency parsers, which can be used to describe, analyze, and compare dependency parsing algorithms. We use this framework to describe several well-known projective and non-projective dependency parsers, build correctness proofs, and establish formal relationships between them. We then use th...
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We present novel parsing algorithms for several sets of mildly non-projective dependency structures. First, we define a parser for well-nested structures of gap degree at most 1, with the same complexity as the best existing parsers for constituency formalisms of equivalent generative power. We then extend this algorithm to handle all well-nested structures with gap degree bounded by any consta...
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An open issue in data-driven dependency parsing is how to handle non-projective dependencies, which seem to be required by linguistically adequate representations, but which pose problems in parsing with respect to both accuracy and efficiency. Using data from five different languages, we evaluate an incremental deterministic parser that derives non-projective dependency structures in O(n2) tim...
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In order to realize the full potential of dependency-based syntactic parsing, it is desirable to allow non-projective dependency structures. We show how a datadriven deterministic dependency parser, in itself restricted to projective structures, can be combined with graph transformation techniques to produce non-projective structures. Experiments using data from the Prague Dependency Treebank s...
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We investigate a series of graph-theoretic constraints on non-projective dependency parsing and their effect on expressivity, i.e. whether they allow naturally occurring syntactic constructions to be adequately represented, and efficiency, i.e. whether they reduce the search space for the parser. In particular, we define a new measure for the degree of non-projectivity in an acyclic dependency ...
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ژورنال
عنوان ژورنال: Computational Linguistics
سال: 2011
ISSN: 0891-2017,1530-9312
DOI: 10.1162/coli_a_00060