Similarity over Factuality: Are we making progress on multimodal out-of-context misinformation detection?

• URL: http://arxiv.org/abs/2407.13488v1
• Date: Thu, 18 Jul 2024 13:08:55 GMT
• Title: Similarity over Factuality: Are we making progress on multimodal out-of-context misinformation detection?
• Authors: Stefanos-Iordanis Papadopoulos, Christos Koutlis, Symeon Papadopoulos, Panagiotis C. Petrantonakis,
• Abstract summary: Out-of-context (OOC) misinformation poses a significant challenge in multimodal fact-checking. Recent research in evidence-based OOC detection has seen a trend towards increasingly complex architectures. We introduce a simple yet robust baseline, which assesses similarity between image-text pairs and external image and text evidence.
• Score: 15.66049149213069
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: Out-of-context (OOC) misinformation poses a significant challenge in multimodal fact-checking, where images are paired with texts that misrepresent their original context to support false narratives. Recent research in evidence-based OOC detection has seen a trend towards increasingly complex architectures, incorporating Transformers, foundation models, and large language models. In this study, we introduce a simple yet robust baseline, which assesses MUltimodal SimilaritiEs (MUSE), specifically the similarity between image-text pairs and external image and text evidence. Our results demonstrate that MUSE, when used with conventional classifiers like Decision Tree, Random Forest, and Multilayer Perceptron, can compete with and even surpass the state-of-the-art on the NewsCLIPpings and VERITE datasets. Furthermore, integrating MUSE in our proposed "Attentive Intermediate Transformer Representations" (AITR) significantly improved performance, by 3.3% and 7.5% on NewsCLIPpings and VERITE, respectively. Nevertheless, the success of MUSE, relying on surface-level patterns and shortcuts, without examining factuality and logical inconsistencies, raises critical questions about how we define the task, construct datasets, collect external evidence and overall, how we assess progress in the field. We release our code at: https://github.com/stevejpapad/outcontext-misinfo-progress

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