AlpacaTag: An Active Learning-based Crowd Annotation Framework for Sequence Tagging Bill Yuchen Lin author Dong-Ho Lee author Frank F Xu author Ouyu Lan author Xiang Ren author 2019-07 text Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics: System Demonstrations Marta R Costa-jussà editor Enrique Alfonseca editor Association for Computational Linguistics Florence, Italy conference publication lin-etal-2019-alpacatag 10.18653/v1/P19-3010 https://aclanthology.org/P19-3010/ 2019-07 58 63