Improving Self-training for Cross-lingual Named Entity Recognition with Contrastive and Prototype Learning Ran Zhou author Xin Li author Lidong Bing author Erik Cambria author Chunyan Miao author 2023-07 text Proceedings of the 61st Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers) Anna Rogers editor Jordan Boyd-Graber editor Naoaki Okazaki editor Association for Computational Linguistics Toronto, Canada conference publication zhou-etal-2023-improving 10.18653/v1/2023.acl-long.222 https://aclanthology.org/2023.acl-long.222/ 2023-07 4018 4031