Unsupervised Token-level Hallucination Detection from Summary Generation By-products Andreas Marfurt author James Henderson author 2022-12 text Proceedings of the Second Workshop on Natural Language Generation, Evaluation, and Metrics (GEM) Antoine Bosselut editor Khyathi Chandu editor Kaustubh Dhole editor Varun Gangal editor Sebastian Gehrmann editor Yacine Jernite editor Jekaterina Novikova editor Laura Perez-Beltrachini editor Association for Computational Linguistics Abu Dhabi, United Arab Emirates (Hybrid) conference publication marfurt-henderson-2022-unsupervised 10.18653/v1/2022.gem-1.21 https://aclanthology.org/2022.gem-1.21/ 2022-12 248 261