Comprehensive OOD Detection Improvements

• URL: http://arxiv.org/abs/2401.10176v1
• Date: Thu, 18 Jan 2024 18:05:35 GMT
• Title: Comprehensive OOD Detection Improvements
• Authors: Anish Lakkapragada, Amol Khanna, Edward Raff, Nathan Inkawhich
• Abstract summary: Out-of-distribution (OOD) detection methods have been created for this task. We employ dimensionality reduction on feature embeddings in representation-based methods for both time speedups and improved performance. We demonstrate the effectiveness of our methods on the OpenOODv1.5 benchmark framework.
• Score: 46.46252643210326
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: As machine learning becomes increasingly prevalent in impactful decisions, recognizing when inference data is outside the model's expected input distribution is paramount for giving context to predictions. Out-of-distribution (OOD) detection methods have been created for this task. Such methods can be split into representation-based or logit-based methods from whether they respectively utilize the model's embeddings or predictions for OOD detection. In contrast to most papers which solely focus on one such group, we address both. We employ dimensionality reduction on feature embeddings in representation-based methods for both time speedups and improved performance. Additionally, we propose DICE-COL, a modification of the popular logit-based method Directed Sparsification (DICE) that resolves an unnoticed flaw. We demonstrate the effectiveness of our methods on the OpenOODv1.5 benchmark framework, where they significantly improve performance and set state-of-the-art results.

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