Performance Gap in Entity Knowledge Extraction Across Modalities in Vision Language Models

• URL: http://arxiv.org/abs/2412.14133v1
• Date: Wed, 18 Dec 2024 18:22:30 GMT
• Title: Performance Gap in Entity Knowledge Extraction Across Modalities in Vision Language Models
• Authors: Ido Cohen, Daniela Gottesman, Mor Geva, Raja Giryes,
• Abstract summary: Vision-language models (VLMs) excel at extracting and reasoning about information from images. This work investigates the disparity in model performance when answering factual questions about an entity described in text versus depicted in an image.
• Score: 36.18155629835474
• License:
• Abstract: Vision-language models (VLMs) excel at extracting and reasoning about information from images. Yet, their capacity to leverage internal knowledge about specific entities remains underexplored. This work investigates the disparity in model performance when answering factual questions about an entity described in text versus depicted in an image. Our results reveal a significant accuracy drop --averaging 19%-- when the entity is presented visually instead of textually. We hypothesize that this decline arises from limitations in how information flows from image tokens to query tokens. We use mechanistic interpretability tools to reveal that, although image tokens are preprocessed by the vision encoder, meaningful information flow from these tokens occurs only in the much deeper layers. Furthermore, critical image processing happens in the language model's middle layers, allowing few layers for consecutive reasoning, highlighting a potential inefficiency in how the model utilizes its layers for reasoning. These insights shed light on the internal mechanics of VLMs and offer pathways for enhancing their reasoning capabilities.

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