Counterfactual Generator: A Weakly-Supervised Method for Named Entity Recognition Xiangji Zeng author Yunliang Li author Yuchen Zhai author Yin Zhang author 2020-11 text Proceedings of the 2020 Conference on Empirical Methods in Natural Language Processing (EMNLP) Bonnie Webber editor Trevor Cohn editor Yulan He editor Yang Liu editor Association for Computational Linguistics Online conference publication zeng-etal-2020-counterfactual 10.18653/v1/2020.emnlp-main.590 https://aclanthology.org/2020.emnlp-main.590/ 2020-11 7270 7280