Language Tags Matter for Zero-Shot Neural Machine Translation Liwei Wu author Shanbo Cheng author Mingxuan Wang author Lei Li author 2021-08 text Findings of the Association for Computational Linguistics: ACL-IJCNLP 2021 Chengqing Zong editor Fei Xia editor Wenjie Li editor Roberto Navigli editor Association for Computational Linguistics Online conference publication wu-etal-2021-language 10.18653/v1/2021.findings-acl.264 https://aclanthology.org/2021.findings-acl.264/ 2021-08 3001 3007