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Learning and Inference for Clause Identification

Xavier CarrerasContact Information, Lluís MàrquezContact Information, Vasin PunyakanokContact Information and Dan RothContact Information

(2)  TALP Research Center—LSI Department, Universitat Politècnica de Catalunya, Madrid, Spain
(3)  Department of Computer Science, University of Illinois, Urbana-Champaign
Abstract
This paper presents an approach to partial parsing of natural language sentences that makes global inference on top of the outcome of hierarchically learned local classifiers. The best decomposition of a sentence into clauses is chosen using a dynamic programming based scheme that takes into account previously identified partial solutions. This inference scheme applies learning at several levels—when identifying potential clauses and when scoring partial solutions. The classifiers are trained in a hierarchical fashion, building on previous classifications. The method presented significantly outperforms the best methods known so far for clause identification.
Supported by a grant from the Catalan Research Department.
This research is partially funded by the Spanish Research Department (TIC2000-0335-C03-02, TIC2000-1735-C02-02) and the EC (NAMIC IST-1999-12392).
Supported by NSF grants IIS-99-84168,ITR-IIS-00-85836 and an ONR MURI award.

Contact Information Xavier Carreras
Email: carreras@lsi.upc.es

Contact Information Lluís Màrquez
Email: lluism@lsi.upc.es

Contact Information Vasin Punyakanok
Email: punyakan@cs.uiuc.edu

Contact Information Dan Roth
Email: danr@cs.uiuc.edu
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