PaliGemma is a new open-source vision-language model (VLM) developed by Google DeepMind researchers. Despite its tiny size, PaliGemma performs well on various visual and linguistic tasks.
The 3-billion parameter model performed well on roughly 40 different benchmarks, including common VLM tasks and more specialized tasks in fields like remote sensing and image segmentation. It does this by combining a SigLIP vision encoder with a Gemma language model.
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With a total of 3 billion parameters, PaliGemma comprises a Vision Transformer image encoder and a Transformer decoder. Gemma-2B is used to initialize the text decoder. SigLIP-So400m/14 is used to initialize the image encoder. The PaLI-3 recipes are used during PaliGemma’s training.
PaliGemma frequently outperforms larger models in tasks like labelling images and interpreting videos. It is perfect for video clips and image pairs because of its architecture, which allows for numerous input images. Without task-specific fine-tuning, it obtains top results on benchmarks such as MMVP and Objaverse Multiview.
A prefix-LM training aims for bidirectional attention, fine-tuning all model components concurrently, a multi-stage training procedure to boost picture resolution, and carefully selected, varied pretraining data. These are important design decisions.
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To evaluate the effects of different architectural and training options, the researchers also carried out comprehensive ablation investigations. Longer pretraining, unfreezing all model components, and higher resolution were proven to be major contributors to PaliGemma’s performance.
By providing PaliGemma as an open base model without instruction tuning, the researchers intend to provide a useful starting point for further research on instruction tuning, specific applications, and clearer distinctions between base models and fine-tuning in VLM development.
The robust performance of this small model implies that well-built VLMs can achieve state-of-the-art outcomes without requiring scaling to large scales, which could lead to more accessible and efficient multimodal AI systems.
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Limitations
The primary purpose of PaliGemma’s design was to function as a general, pre-trained model that could be applied to specialized applications. As a result, its “zero-shot” or “out of the box” performance may not match that of models made especially for it.
PaliGemma is not a chatbot with multiple turns. It is made to accept text and image input in a single round.
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