Diffusion based Semantic Outlier Generation via Nuisance Awareness for Out-of-Distribution Detection

• URL: http://arxiv.org/abs/2408.14841v1
• Date: Tue, 27 Aug 2024 07:52:44 GMT
• Title: Diffusion based Semantic Outlier Generation via Nuisance Awareness for Out-of-Distribution Detection
• Authors: Suhee Yoon, Sanghyu Yoon, Hankook Lee, Ye Seul Sim, Sungik Choi, Kyungeun Lee, Hye-Seung Cho, Woohyung Lim,
• Abstract summary: Out-of-distribution (OOD) detection has recently shown promising results through training with synthetic OOD datasets. We propose a novel framework, Semantic Outlier generation via Nuisance Awareness (SONA), which notably produces challenging outliers. Our approach incorporates SONA guidance, providing separate control over semantic and nuisance regions of ID samples.
• Score: 9.936136347796413
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Out-of-distribution (OOD) detection, which determines whether a given sample is part of the in-distribution (ID), has recently shown promising results through training with synthetic OOD datasets. Nonetheless, existing methods often produce outliers that are considerably distant from the ID, showing limited efficacy for capturing subtle distinctions between ID and OOD. To address these issues, we propose a novel framework, Semantic Outlier generation via Nuisance Awareness (SONA), which notably produces challenging outliers by directly leveraging pixel-space ID samples through diffusion models. Our approach incorporates SONA guidance, providing separate control over semantic and nuisance regions of ID samples. Thereby, the generated outliers achieve two crucial properties: (i) they present explicit semantic-discrepant information, while (ii) maintaining various levels of nuisance resemblance with ID. Furthermore, the improved OOD detector training with SONA outliers facilitates learning with a focus on semantic distinctions. Extensive experiments demonstrate the effectiveness of our framework, achieving an impressive AUROC of 88% on near-OOD datasets, which surpasses the performance of baseline methods by a significant margin of approximately 6%.

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