UiO1: Constituent-Based Discriminative Ranking for Negation Resolution

Abstract

This paper describes the first of two systems submitted from the University of Oslo (UiO) to the 2012 *SEM Shared Task on resolving negation. Our submission is an adaption of the negation system of Velldal et al. (2012), which combines SVM cue classification with SVM-based ranking of syntactic constituents for scope resolution. The approach further extends our prior work in that we also identify factual negated events. While submitted for the closed track, the system was the top performer in the shared task overall. 1