Paper: Multi-Event Extraction Guided by Global Constraints

ACL ID N12-1008
Title Multi-Event Extraction Guided by Global Constraints
Venue Annual Conference of the North American Chapter of the Association for Computational Linguistics
Session Main Conference
Year 2012

This paper addresses the extraction of event records from documents that describe multi- ple events. Specifically, we aim to identify the fields of information contained in a docu- ment and aggregate together those fields that describe the same event. To exploit the in- herent connections between field extraction and event identification, we propose to model them jointly. Our model is novel in that it integrates information from separate sequen- tial models, using global potentials that en- courage the extracted event records to have desired properties. While the model con- tains high-order potentials, efficient approxi- mate inference can be performed with dual- decomposition. We experiment with two data sets that consist of newspaper articles de- scribing multiple terrorism events, and s...