Jaisidh Singh Diganta Misra Boris Knyazev Antonio Orvieto (Almost) Free Modality Stitching of Foundation Models. 19773-19789 2025 EMNLP https://doi.org/10.18653/v1/2025.emnlp-main.1001 conf/emnlp/2025 db/conf/emnlp/emnlp2025.html#SinghMKO25 streams/conf/emnlp