Detecting Negation Cues and Scopes in Spanish
Salud Mar{\'\i}a Jim{\'e}nez-Zafra, Roser Morante, Eduardo Blanco, Mar{\'\i}a Teresa Mart{\'\i}n Valdivia, L. Alfonso Ure{\~n}a- L{\'o}pez
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In this work we address the processing of negation in Spanish. We first present a machine learning system that processes negation in Spanish. Specifically, we focus on two tasks: i) negation cue detection and ii) scope identification. The corpus used in the experimental framework is the SFU Corpus. The results for cue detection outperform state-of-the-art results, whereas for scope detection this is the first system that performs the task for Spanish. Moreover, we provide a qualitative error analysis aimed at understanding the limitations of the system and showing which negation cues and scopes are straightforward to predict automatically, and which ones are challenging.