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Hybrid Grammars for Parsing of Discontinuous Phrase Structures and Non-Projective Dependency Structures.
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- Author(s): Gebhardt, Kilian; Nederhof, Mark-Jan; Vogler, Heiko
- Source:
Computational Linguistics; Sep2017, Vol. 43 Issue 3, p465-520, 56p- Subject Terms:
- Source:
- Additional Information
- Abstract: We explore the concept of hybrid grammars, which formalize and generalize a range of existing frameworks for dealing with discontinuous syntactic structures. Covered are both discontinuous phrase structures and non-projective dependency structures. Technically, hybrid grammars are related to synchronous grammars, where one grammar component generates linear structures and another generates hierarchical structures. By coupling lexical elements of both components together, discontinuous structures result. Several types of hybrid grammars are characterized. We also discuss grammar induction from treebanks. The main advantage over existing frameworks is the ability of hybrid grammars to separate discontinuity of the desired structures from time complexity of parsing. This permits exploration of a large variety of parsing algorithms for discontinuous structures, with different properties. This is confirmed by the reported experimental results, which show a wide variety of running time, accuracy, and frequency of parse failures. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Computational Linguistics is the property of MIT Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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