@inproceedings{ctrlevalanunsupervisedreferencefree,
  title = {CTRLEval: An Unsupervised Reference-Free Metric for Evaluating Controlled Text Generation},
  author = {Pei Ke and Hao Zhou and Yankai Lin and Peng Li and Jie zhou and Xiaoyan Zhu and Minlie Huang},
  year = {2022},
  booktitle = {ACL 2022 5},
  eprint = {2204.00862},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2204.00862v2},
}