Document-Level Event Argument Extraction by Conditional Generation

04/13/2021 ∙ by Sha Li, et al. ∙ 0

Event extraction has long been treated as a sentence-level task in the IE community. We argue that this setting does not match human information-seeking behavior and leads to incomplete and uninformative extraction results. We propose a document-level neural event argument extraction model by formulating the task as conditional generation following event templates. We also compile a new document-level event extraction benchmark dataset WikiEvents which includes complete event and coreference annotation. On the task of argument extraction, we achieve an absolute gain of 7.6 the RAMS and WikiEvents datasets respectively. On the more challenging task of informative argument extraction, which requires implicit coreference reasoning, we achieve a 9.3 portability of our model, we also create the first end-to-end zero-shot event extraction framework and achieve 97 extraction performance and 82 only access to 10 out of the 33 types on ACE.

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