A Bag-of-concepts Model Improves Relation Extraction in a Narrow Knowledge Domain with Limited Data Jiyu Chen author Karin Verspoor author Zenan Zhai author 2019-06 text Proceedings of the 2019 Conference of the North American Chapter of the Association for Computational Linguistics: Student Research Workshop Sudipta Kar editor Farah Nadeem editor Laura Burdick editor Greg Durrett editor Na-Rae Han editor Association for Computational Linguistics Minneapolis, Minnesota conference publication chen-etal-2019-bag 10.18653/v1/N19-3007 https://aclanthology.org/N19-3007/ 2019-06 43 52