ViLBias: Detecting and Reasoning about Bias in Multimodal Content
- URL: http://arxiv.org/abs/2412.17052v5
- Date: Fri, 03 Oct 2025 11:22:35 GMT
- Title: ViLBias: Detecting and Reasoning about Bias in Multimodal Content
- Authors: Shaina Raza, Caesar Saleh, Azib Farooq, Emrul Hasan, Franklin Ogidi, Maximus Powers, Veronica Chatrath, Marcelo Lotif, Karanpal Sekhon, Roya Javadi, Haad Zahid, Anam Zahid, Vahid Reza Khazaie, Zhenyu Yu,
- Abstract summary: ViLBias is a framework for detecting and reasoning about bias in multimodal news.<n> dataset comprises 40,945 text--image pairs from diverse outlets.<n>Results show that images alongside text improves detection accuracy by 3--5%.
- Score: 6.710013984078675
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Detecting bias in multimodal news requires models that reason over text--image pairs, not just classify text. In response, we present ViLBias, a VQA-style benchmark and framework for detecting and reasoning about bias in multimodal news. The dataset comprises 40,945 text--image pairs from diverse outlets, each annotated with a bias label and concise rationale using a two-stage LLM-as-annotator pipeline with hierarchical majority voting and human-in-the-loop validation. We evaluate Small Language Models (SLMs), Large Language Models (LLMs), and Vision--Language Models (VLMs) across closed-ended classification and open-ended reasoning (oVQA), and compare parameter-efficient tuning strategies. Results show that incorporating images alongside text improves detection accuracy by 3--5\%, and that LLMs/VLMs better capture subtle framing and text--image inconsistencies than SLMs. Parameter-efficient methods (LoRA/QLoRA/Adapters) recover 97--99\% of full fine-tuning performance with $<5\%$ trainable parameters. For oVQA, reasoning accuracy spans 52--79\% and faithfulness 68--89\%, both improved by instruction tuning; closed accuracy correlates strongly with reasoning ($r = 0.91$). ViLBias offers a scalable benchmark and strong baselines for multimodal bias detection and rationale quality.
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