Learning and Inference for Clause Identification
Xavier Carreras2
, Lluís Màrquez2
, Vasin Punyakanok3
and Dan Roth3 
| (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.
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