CLIPScore: A Reference-free Evaluation Metric for Image Captioning Jack Hessel author Ari Holtzman author Maxwell Forbes author Ronan Le Bras author Yejin Choi author 2021-11 text Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing Marie-Francine Moens editor Xuanjing Huang editor Lucia Specia editor Scott Wen-tau Yih editor Association for Computational Linguistics Online and Punta Cana, Dominican Republic conference publication hessel-etal-2021-clipscore 10.18653/v1/2021.emnlp-main.595 https://aclanthology.org/2021.emnlp-main.595/ 2021-11 7514 7528