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Mahalanobis distance (MD) is a simple and popular post-processing method for detecting out-of-distribution (OOD) inputs in neural networks. We analyze its failure modes for near-OOD detection and propose a simple fix called relative…

Machine Learning · Computer Science 2021-06-18 Jie Ren , Stanislav Fort , Jeremiah Liu , Abhijit Guha Roy , Shreyas Padhy , Balaji Lakshminarayanan

Implementing neural networks for clinical use in medical applications necessitates the ability for the network to detect when input data differs significantly from the training data, with the aim of preventing unreliable predictions. The…

Computer Vision and Pattern Recognition · Computer Science 2023-09-06 Harry Anthony , Konstantinos Kamnitsas

Out-of-distribution (OOD) detection is a critical task for deploying machine learning models in the open world. Distance-based methods have demonstrated promise, where testing samples are detected as OOD if they are relatively far away from…

Machine Learning · Computer Science 2022-12-09 Yiyou Sun , Yifei Ming , Xiaojin Zhu , Yixuan Li

Dialect classification is used in a variety of applications, such as machine translation and speech recognition, to improve the overall performance of the system. In a real-world scenario, a deployed dialect classification model can…

Computation and Language · Computer Science 2024-03-26 Sourya Dipta Das , Yash Vadi , Abhishek Unnam , Kuldeep Yadav

Out-of-distribution detection is an important component of reliable ML systems. Prior literature has proposed various methods (e.g., MSP (Hendrycks & Gimpel, 2017), ODIN (Liang et al., 2018), Mahalanobis (Lee et al., 2018)), claiming they…

Machine Learning · Computer Science 2021-09-14 Fahim Tajwar , Ananya Kumar , Sang Michael Xie , Percy Liang

Out-of-distribution (OOD) detection is critical for reliable deployment of vision models. Mahalanobis-based detectors remain strong baselines, yet their performance varies widely across modern pretrained representations, and it is unclear…

Machine Learning · Computer Science 2026-03-05 Denis Janiak , Jakub Binkowski , Tomasz Kajdanowicz

Detecting out-of-distribution (OOD) examples is an important task for deploying reliable machine learning models in safety-critial applications. While post-hoc methods based on the Mahalanobis distance applied to pre-logit features are…

Machine Learning · Computer Science 2025-05-26 Maximilian Mueller , Matthias Hein

Identifying out-of-distribution (OOD) data at inference time is crucial for many machine learning applications, especially for automation. We present a novel unsupervised semi-parametric framework COMBOOD for OOD detection with respect to…

Computer Vision and Pattern Recognition · Computer Science 2026-02-10 Magesh Rajasekaran , Md Saiful Islam Sajol , Frej Berglind , Supratik Mukhopadhyay , Kamalika Das

The superior performance of object detectors is often established under the condition that the test samples are in the same distribution as the training data. However, in many practical applications, out-of-distribution (OOD) instances are…

Computer Vision and Pattern Recognition · Computer Science 2023-10-31 Tianhao Zhang , Shenglin Wang , Nidhal Bouaynaya , Radu Calinescu , Lyudmila Mihaylova

The Mahalanobis distance-based confidence score, a recently proposed anomaly detection method for pre-trained neural classifiers, achieves state-of-the-art performance on both out-of-distribution (OoD) and adversarial examples detection.…

Machine Learning · Statistics 2020-05-01 Ryo Kamoi , Kei Kobayashi

Out-of-distribution (OOD) detection is a critical component for ensuring the reliability of deep neural networks in safety-critical applications. In this work, we present a key empirical observation: for in-distribution (ID) samples,…

Machine Learning · Computer Science 2026-05-15 Donghwan Kim , Hyunsoo Yoon

Unsupervised out-of-distribution (U-OOD) detection has recently attracted much attention due its importance in mission-critical systems and broader applicability over its supervised counterpart. Despite this increase in attention, U-OOD…

Computer Vision and Pattern Recognition · Computer Science 2022-07-22 Lars Doorenbos , Raphael Sznitman , Pablo Márquez-Neila

Deep learning models have become a popular choice for medical image analysis. However, the poor generalization performance of deep learning models limits them from being deployed in the real world as robustness is critical for medical…

Computer Vision and Pattern Recognition · Computer Science 2021-07-19 Anisie Uwimana1 , Ransalu Senanayake

In many critical Machine Learning applications, such as autonomous driving and medical image diagnosis, the detection of out-of-distribution (OOD) samples is as crucial as accurately classifying in-distribution (ID) inputs. Recently Outlier…

Computer Vision and Pattern Recognition · Computer Science 2024-10-11 Lakpa D. Tamang , Mohamed Reda Bouadjenek , Richard Dazeley , Sunil Aryal

Novelty detection aims to automatically identify out-of-distribution (OOD) data, without any prior knowledge of them. It is a critical step in data monitoring, behavior analysis and other applications, helping enable continual learning in…

Machine Learning · Computer Science 2021-12-21 Jingbo Sun , Li Yang , Jiaxin Zhang , Frank Liu , Mahantesh Halappanavar , Deliang Fan , Yu Cao

We explore the utility of information contained within a dropout based Bayesian neural network (BNN) for the task of detecting out of distribution (OOD) data. We first show how previous attempts to leverage the randomized embeddings induced…

Machine Learning · Computer Science 2022-02-21 Andre T. Nguyen , Fred Lu , Gary Lopez Munoz , Edward Raff , Charles Nicholas , James Holt

Automatic segmentation of ground glass opacities and consolidations in chest computer tomography (CT) scans can potentially ease the burden of radiologists during times of high resource utilisation. However, deep learning models are not…

Image and Video Processing · Electrical Eng. & Systems 2022-08-08 Camila Gonzalez , Karol Gotkowski , Moritz Fuchs , Andreas Bucher , Armin Dadras , Ricarda Fischbach , Isabel Kaltenborn , Anirban Mukhopadhyay

Convolutional neural networks applied for real-world classification tasks need to recognize inputs that are far or out-of-distribution (OoD) with respect to the known or training data. To achieve this, many methods estimate…

Machine Learning · Computer Science 2021-10-18 Kamil Szyc , Tomasz Walkowiak , Henryk Maciejewski

Purpose: A fundamental problem in designing safe machine learning systems is identifying when samples presented to a deployed model differ from those observed at training time. Detecting so-called out-of-distribution (OoD) samples is…

Computer Vision and Pattern Recognition · Computer Science 2023-05-04 Alain Jungo , Lars Doorenbos , Tommaso Da Col , Maarten Beelen , Martin Zinkernagel , Pablo Márquez-Neila , Raphael Sznitman

Neural network-based radio receivers are expected to play a key role in future wireless systems, making reliable Out-Of-Distribution (OOD) detection essential. We propose a post-hoc, layerwise OOD framework based on channelwise feature…

Machine Learning · Computer Science 2026-01-15 Marko Tuononen , Heikki Penttinen , Duy Vu , Dani Korpi , Vesa Starck , Ville Hautamäki
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