Assessing Modality Bias in Video Question Answering Benchmarks with Multimodal Large Language Models

• URL: http://arxiv.org/abs/2408.12763v1
• Date: Thu, 22 Aug 2024 23:32:42 GMT
• Title: Assessing Modality Bias in Video Question Answering Benchmarks with Multimodal Large Language Models
• Authors: Jean Park, Kuk Jin Jang, Basam Alasaly, Sriharsha Mopidevi, Andrew Zolensky, Eric Eaton, Insup Lee, Kevin Johnson,
• Abstract summary: We introduce the modality importance score (MIS) to identify bias inVidQA benchmarks and datasets. We also propose an innovative method using state-of-the-art MLLMs to estimate the modality importance. Our results indicate that current models do not effectively integrate information due to modality imbalance in existing datasets.
• Score: 12.841405829775852
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Multimodal large language models (MLLMs) can simultaneously process visual, textual, and auditory data, capturing insights that complement human analysis. However, existing video question-answering (VidQA) benchmarks and datasets often exhibit a bias toward a single modality, despite the goal of requiring advanced reasoning skills that integrate diverse modalities to answer the queries. In this work, we introduce the modality importance score (MIS) to identify such bias. It is designed to assess which modality embeds the necessary information to answer the question. Additionally, we propose an innovative method using state-of-the-art MLLMs to estimate the modality importance, which can serve as a proxy for human judgments of modality perception. With this MIS, we demonstrate the presence of unimodal bias and the scarcity of genuinely multimodal questions in existing datasets. We further validate the modality importance score with multiple ablation studies to evaluate the performance of MLLMs on permuted feature sets. Our results indicate that current models do not effectively integrate information due to modality imbalance in existing datasets. Our proposed MLLM-derived MIS can guide the curation of modality-balanced datasets that advance multimodal learning and enhance MLLMs' capabilities to understand and utilize synergistic relations across modalities.

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