Effective Event Extraction Method via Enhanced Graph Convolutional Network Indication with Hierarchical Argument Selection Strategy

Abstract

As one of foundation technologies for massive data processing for AI, event mining is attracting more and more attention, mainly including event detection (event trigger identification and event classification) and argument extraction. At present, EE-GCN is one of the most effective methods for event detection. However, since EE-GCN only focuses on event detection, complete event multi-tuple extraction needs to be improved. Inspired by the EE-GCN event detection method, this paper proposes an effective event extraction method via graph convolutional network indication with a hierarchical argument selection strategy. The method mainly includes the following steps. (1) Based on the ACE2005 argument extraction template, a new argument extraction template is established for the Baidu event extraction dataset. (2) The trigger events and event classification detected by EE-GCN are used as indicators to determine the argument extraction template, and the alternative arguments are extracted via named entity recognition based on the determined template. (3) Making full use of the side information of EE-GCN graph to solve the local and global correlation degree, and based on the local and global correlation degrees, the final argument multi-tuple is determined. (4) Finally, several experiments are conducted on the Baidu event extraction dataset to compare the proposed method with other methods. The experimental results show that the proposed method has improved the accuracy and completeness of the event extraction compared to other existing methods.