Enhancing Few-Shot Vision-Language Classification with Large Multimodal Model Features

• URL: http://arxiv.org/abs/2412.00142v3
• Date: Mon, 09 Jun 2025 17:01:06 GMT
• Title: Enhancing Few-Shot Vision-Language Classification with Large Multimodal Model Features
• Authors: Chancharik Mitra, Brandon Huang, Tianning Chai, Zhiqiu Lin, Assaf Arbelle, Rogerio Feris, Leonid Karlinsky, Trevor Darrell, Deva Ramanan, Roei Herzig,
• Abstract summary: Generative Large Multimodal Models (LMMs) excel at a wide variety of vision-language (VL) tasks.<n>Despite strong performance, LMMs' generative outputs are not specialized for vision-language classification tasks.<n>We propose an approach that leverages multimodal feature extraction from the LMM's latent space.
• Score: 79.45405711339322
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Generative Large Multimodal Models (LMMs) like LLaVA and Qwen-VL excel at a wide variety of vision-language (VL) tasks. Despite strong performance, LMMs' generative outputs are not specialized for vision-language classification tasks (i.e., tasks with vision-language inputs and discrete labels) such as image classification and multiple-choice VQA. One key challenge in utilizing LMMs for these tasks is the extraction of useful features from generative LMMs. To overcome this, we propose an approach that leverages multimodal feature extraction from the LMM's latent space. Toward this end, we present Sparse Attention Vectors (SAVs) -- a finetuning-free method that leverages sparse attention head activations (fewer than 5% of the heads) in LMMs as strong feature representations. With only few-shot examples, SAVs demonstrate state-of-the-art performance compared to a variety of few-shot and finetuned baselines on a collection of vision-language classification tasks. Our experiments also imply that SAVs can scale in performance with additional examples and generalize to similar tasks, establishing SAVs as both effective and robust multimodal feature representations.

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