UTNLP at SemEval-2021 Task 5: A Comparative Analysis of Toxic Span Detection using Attention-based, Named Entity Recognition, and Ensemble Models Alireza Salemi author Nazanin Sabri author Emad Kebriaei author Behnam Bahrak author Azadeh Shakery 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 salemi-etal-2021-utnlp 10.18653/v1/2021.semeval-1.136 https://aclanthology.org/2021.semeval-1.136/ 2021-08 995 1002