UiO2: sequence-labeling negation using dependency features

Authors:
Emanuele Lapponi;Erik Velldal;Lilja Øvrelid;Jonathon Read
Affiliations:
University of Oslo;University of Oslo;University of Oslo;University of Oslo
Venue:
SemEval '12 Proceedings of the First Joint Conference on Lexical and Computational Semantics - Volume 1: Proceedings of the main conference and the shared task, and Volume 2: Proceedings of the Sixth International Workshop on Semantic Evaluation
Year:
2012

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Abstract

This paper describes the second of two systems submitted from the University of Oslo (UiO) to the 2012 *SEM Shared Task on resolving negation. The system combines SVM cue classification with CRF sequence labeling of events and scopes. Models for scopes and events are created using lexical and syntactic features, together with a fine-grained set of labels that capture the scopal behavior of certain tokens. Following labeling, negated tokens are assigned to their respective cues using simple post-processing heuristics. The system was ranked first in the open track and third in the closed track, and was one of the top performers in the scope resolution sub-task overall.