Using Cross-Entity Inference to Improve Event Extraction

This paper proposes a new method of event extraction by well using cross-entity inference that regard entity-type consistency as key feature to predict event mentions and adopts this inference method to improve the traditional sentence-level event extraction system.

Abstract

Event extraction is the task of detecting certain specified types of events that are mentioned in the source language data. The state-of-the-art research on the task is transductive inference (e.g. cross-event inference). In this paper, we propose a new method of event extraction by well using cross-entity inference. In contrast to previous inference methods, we regard entitytype consistency as key feature to predict event mentions. We adopt this inference method to improve the traditional sentence-level event extraction system. Experiments show that we can get 8.6 % gain in trigger (event) identification, and more than 11.8 % gain for argument (role) classification in ACE event extraction. 1