CTRLEval: An Unsupervised Reference-Free Metric for Evaluating Controlled Text Generation Pei Ke author Hao Zhou author Yankai Lin author Peng Li author Jie Zhou author Xiaoyan Zhu author Minlie Huang 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 ke-etal-2022-ctrleval 10.18653/v1/2022.acl-long.164 https://aclanthology.org/2022.acl-long.164/ 2022-05 2306 2319