Event Extraction as Dependency Parsing.
BioNLP Shared Task '11: Proceedings of the BioNLP Shared Task 2011 Workshop(2011)
摘要
We describe the Stanford entry to the BioNLP 2011 shared task on biomolecular event extraction (Kim et al., 2011a). Our framework is based on the observation that event structures bear a close relation to dependency graphs. We show that if biomolecular events are cast as these pseudosyntactic structures, standard parsing tools (maximum-spanning tree parsers and parse rerankers) can be applied to perform event extraction with minimum domain-specific tuning. The vast majority of our domain-specific knowledge comes from the conversion to and from dependency graphs. Our system performed competitively, obtaining 3rd place in the Infectious Diseases track (50.6% f -score), 5th place in Epigenetics and Post-translational Modifications (31.2%), and 7th place in Genia (50.0%). Additionally, this system was part of the combined system in Riedel et al. (2011) to produce the highest scoring system in three out of the four event extraction tasks.
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关键词
Nested event structure,biomedical event,current approaches address event,flat event structure,domain specific extraction task,open domain,simple approach,simple framework,F1 score,common occurrence,dependency parsing,event extraction
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