Document Level Time-anchoring for TimeLine Extraction

This paper investigates the contribution of document level processing of timeanchors for TimeLine event extraction. We developed and tested two different systems. The first one is a baseline system that captures explicit time-anchors. The second one extends the baseline system by also capturing implicit time relations. We have evaluated both approaches in the SemEval 2015 task 4 TimeLine: CrossDocument Event Ordering. We empirically demonstrate that the document-based approach obtains a much more complete time anchoring. Moreover, this approach almost doubles the performance of the systems that participated in the task.

• Type: Journal
• Year: 2015
• Where: ACL
• Authors: Egoitz Laparra, Itziar Aldabe, German Rigau
• Keywords: ACL 2015, Computational Linguistics