HITSZ-HLT at SemEval-2021 Task 5: Ensemble Sequence Labeling and Span Boundary Detection for Toxic Span Detection Qinglin Zhu author Zijie Lin author Yice Zhang author Jingyi Sun author Xiang Li author Qihui Lin author Yixue Dang author Ruifeng Xu author 2021-08 text Proceedings of the 15th International Workshop on Semantic Evaluation (SemEval-2021) Alexis Palmer editor Nathan Schneider editor Natalie Schluter editor Guy Emerson editor Aurelie Herbelot editor Xiaodan Zhu editor Association for Computational Linguistics Online conference publication zhu-etal-2021-hitsz 10.18653/v1/2021.semeval-1.63 https://aclanthology.org/2021.semeval-1.63/ 2021-08 521 526