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Computational Linguistics

Paola Merlo, Editor
September 2011, Vol. 37, No. 3, Pages 541-586
(doi: 10.1162/COLI_a_00060)
© 2011 Association for Computational Linguistics
Dependency Parsing Schemata and Mildly Non-Projective Dependency Parsing
Article PDF (647.82 KB)
Abstract

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 the framework to define new polynomial-time parsing algorithms for various mildly non-projective dependency formalisms, including well-nested structures with their gap degree bounded by a constant k in time O(n5+2k), and a new class that includes all gap degree k structures present in several natural language treebanks (which we call mildly ill-nested structures for gap degree k) in time O(n4+3k). Finally, we illustrate how the parsing schema framework can be applied to Link Grammar, a dependency-related formalism.