Active Learning by Acquiring Contrastive Examples Katerina Margatina author Giorgos Vernikos author Loïc Barrault author Nikolaos Aletras author 2021-11 text Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing Marie-Francine Moens editor Xuanjing Huang editor Lucia Specia editor Scott Wen-tau Yih editor Association for Computational Linguistics Online and Punta Cana, Dominican Republic conference publication margatina-etal-2021-active 10.18653/v1/2021.emnlp-main.51 https://aclanthology.org/2021.emnlp-main.51/ 2021-11 650 663