Event Type Recognition Based on Trigger Expansion |
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Authors: | Bing Qin Yanyan Zhao Xiao Ding Ting Liu Guofu Zhai |
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Institution: | 1. Research Center for Information Retrieval, School of Computer Science and Technology, Harbin Institute of Technology, Harbin 150001, China;2. School of Electrical and Information Engineering, Harbin Institute of Technology, Harbin 150001, China |
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Abstract: | Event extraction is an important research point in information extraction, which includes two important sub-tasks of event type recognition and event argument recognition. This paper describes a method based on automatic expansion of the event triggers for event type recognition. The event triggers are first extended through a thesaurus to enable the extraction of the candidate events and their candidate types. Then, a binary classification method is used to recognize the candidate event types. This method effectively improves the unbalanced data problem in training models and the data sparseness problem with a small corpus. Evaluations on the ACE2005 dataset give a final F-score of 61.24%, which outperforms traditional methods based on pure machine learning. |
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