Label Refinement via Contrastive Learning for Distantly-Supervised Named Entity Recognition Huaiyuan Ying author Shengxuan Luo author Tiantian Dang author Sheng Yu author 2022-07 text Findings of the Association for Computational Linguistics: NAACL 2022 Marine Carpuat editor Marie-Catherine de Marneffe editor Ivan Vladimir Meza Ruiz editor Association for Computational Linguistics Seattle, United States conference publication ying-etal-2022-label 10.18653/v1/2022.findings-naacl.203 https://aclanthology.org/2022.findings-naacl.203/ 2022-07 2656 2666