PaliGemma 2: A Family of Versatile VLMs for Transfer
Authors: name: Andreas Steiner, name: André Susano Pinto, name: Michael Tschannen, name: Daniel Keysers, name: Xiao Wang, name: Yonatan Bitton, name: Alexey Gritsenko, name: Matthias Minderer, name: Anthony Sherbondy, name: Shangbang Long, name: Siyang Qin, name: Reeve Ingle, name: Emanuele Bugliarello, name: Sahar Kazemzadeh, name: Thomas Mesnard, name: Ibrahim Alabdulmohsin, name: Lucas Beyer, name: Xiaohua Zhai

PaliGemma 2 is an upgrade of the PaliGemma open Vision-Language Model (VLM)
based on the Gemma 2 family of language models. We combine the SigLIP-So400m
vision encoder that was also used by PaliGemma with the whole range of Gemma 2
models, from the 2B one all the way up to the 27B model. We train these models
at three resolutions (224px, 448px, and 896px) in multiple stages to equip them
with broad knowledge for transfer via fine-tuning. The resulting family of base
models covering different model sizes and resolutions allows us to investigate
factors impacting transfer performance (such as learning rate) and to analyze
the interplay between the type of task, model size, and resolution. We further
increase the number and breadth of transfer tasks beyond the scope of PaliGemma
including different OCR-related tasks such as table structure recognition,
molecular structure recognition, music score recognition, as well as long
fine-grained captioning and radiography report generation, on which PaliGemma 2
obtains state-of-the-art results.