Hirano, Shinnosuke, Yuiga Wada, Kazuki Matsuda, Seitaro Otsuki, and Komei Sugiura. 2026. “LLM-Free Image Captioning Evaluation in Reference-Flexible Settings”. Proceedings of the AAAI Conference on Artificial Intelligence 40 (6):4708-16. https://doi.org/10.1609/aaai.v40i6.42472.