Conference Proceedings

A Bag-of-concepts Model Improves Relation Extraction in a Narrow Knowledge Domain with Limited Data

Jiyu Chen, Karin Verspoor, Zenan Zhai

Proceedings of the 2019 Conference of the North | Association for Computational Linguistics | Published : 2019


This paper focuses on a traditional relation extraction task in the context of limited annotated data and a narrow knowledge domain. We explore this task with a clinical corpus consisting of 200 breast cancer follow-up treatment letters in which 16 distinct types of relations are annotated. We experiment with an approach to extracting typed relations called window-bounded co-occurrence (WBC), which uses an adjustable context window around entity mentions of a relevant type, and compare its performance with a more typical intra-sentential co-occurrence baseline. We further introduce a new bag-of-concepts (BoC) approach to feature engineering based on the state-of-the-art word embeddings and w..

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