A Token-level Reference-free Hallucination Detection Benchmark for Free-form Text Generation Tianyu Liu author Yizhe Zhang author Chris Brockett author Yi Mao author Zhifang Sui author Weizhu Chen author Bill Dolan author 2022-05 text Proceedings of the 60th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers) Smaranda Muresan editor Preslav Nakov editor Aline Villavicencio editor Association for Computational Linguistics Dublin, Ireland conference publication liu-etal-2022-token 10.18653/v1/2022.acl-long.464 https://aclanthology.org/2022.acl-long.464/ 2022-05 6723 6737