T 2 -NER: A Two-Stage Span-Based Framework for Unified Named Entity Recognition with Templates Peixin Huang author Xiang Zhao author Minghao Hu author Zhen Tan author Weidong Xiao author 2023 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal huang-etal-2023-2 10.1162/tacl_a_00602 https://aclanthology.org/2023.tacl-1.72/ 2023 11 1265 1282