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Out-of-distribution (OOD) detection is a critical task in machine learning that seeks to identify abnormal samples. Traditionally, unsupervised methods utilize a deep generative model for OOD detection. However, such approaches require a…

Machine Learning · Computer Science 2024-10-25 Alvin Heng , Alexandre H. Thiery , Harold Soh

Out-of-Distribution (OOD) detection is crucial when deploying machine learning models in open-world applications. The core challenge in OOD detection is mitigating the model's overconfidence on OOD data. While recent methods using auxiliary…

Computer Vision and Pattern Recognition · Computer Science 2024-12-10 Jiankang Chen , Ling Deng , Zhiyong Gan , Wei-Shi Zheng , Ruixuan Wang

Pretrained Transformers achieve remarkable performance when training and test data are from the same distribution. However, in real-world scenarios, the model often faces out-of-distribution (OOD) instances that can cause severe semantic…

Computation and Language · Computer Science 2022-01-24 Wenxuan Zhou , Fangyu Liu , Muhao Chen

In the real world, a learning system could receive an input that is unlike anything it has seen during training. Unfortunately, out-of-distribution samples can lead to unpredictable behaviour. We need to know whether any given input belongs…

Machine Learning · Computer Science 2019-08-21 Alireza Shafaei , Mark Schmidt , James J. Little

Out-of-distribution detection is an important capability that has long eluded vanilla neural networks. Deep Neural networks (DNNs) tend to generate over-confident predictions when presented with inputs that are significantly…

Machine Learning · Computer Science 2022-02-24 Sumedh A Sontakke , Buvaneswari Ramanan , Laurent Itti , Thomas Woo

3D semantic occupancy prediction is central to autonomous driving, yet current methods are vulnerable to long-tailed class bias and out-of-distribution (OOD) inputs, often overconfidently assigning anomalies to rare classes. We present…

Computer Vision and Pattern Recognition · Computer Science 2026-04-02 Yuheng Zhang , Mengfei Duan , Kunyu Peng , Yuhang Wang , Di Wen , Danda Pani Paudel , Luc Van Gool , Kailun Yang

One of the early weaknesses identified in deep neural networks trained for image classification tasks was their inability to provide low confidence predictions on out-of-distribution (OOD) data that was significantly different from the…

Computer Vision and Pattern Recognition · Computer Science 2025-08-26 Evelyn Mannix , Howard Bondell

As vision-language models like CLIP are widely applied to zero-shot tasks and gain remarkable performance on in-distribution (ID) data, detecting and rejecting out-of-distribution (OOD) inputs in the zero-shot setting have become crucial…

Computer Vision and Pattern Recognition · Computer Science 2024-06-04 Choubo Ding , Guansong Pang

This paper presents a principled approach for detecting out-of-distribution (OOD) samples in deep neural networks (DNN). Modeling probability distributions on deep features has recently emerged as an effective, yet computationally cheap…

Machine Learning · Computer Science 2020-12-09 Ibrahima Ndiour , Nilesh Ahuja , Omesh Tickoo

Out-of-distribution (OOD) detection is crucial in many real-world applications. However, intelligent models are often trained solely on in-distribution (ID) data, leading to overconfidence when misclassifying OOD data as ID classes. In this…

Computer Vision and Pattern Recognition · Computer Science 2024-12-10 Jiankang Chen , Tong Zhang , Wei-Shi Zheng , Ruixuan Wang

Deep neural networks have attained remarkable performance when applied to data that comes from the same distribution as that of the training set, but can significantly degrade otherwise. Therefore, detecting whether an example is…

Computer Vision and Pattern Recognition · Computer Science 2020-04-02 Yen-Chang Hsu , Yilin Shen , Hongxia Jin , Zsolt Kira

Deep neural networks (DNNs) perform well at classifying inputs associated with the classes they have been trained on, which are known as in distribution inputs. However, out-of-distribution (OOD) inputs pose a great challenge to DNNs and…

Machine Learning · Computer Science 2021-02-24 Guy Amit , Moshe Levy , Ishai Rosenberg , Asaf Shabtai , Yuval Elovici

\noindent Out-of-distribution (OOD) detection is essential for the safe deployment of machine learning models. Extensive work has focused on devising various scoring functions for detecting OOD samples, while only a few studies focus on…

Computer Vision and Pattern Recognition · Computer Science 2026-02-25 Yifan Ding , Xixi Liu , Jonas Unger , Gabriel Eilertsen

Existing out-of-distribution (OOD) detection methods are typically benchmarked on training sets with balanced class distributions. However, in real-world applications, it is common for the training sets to have long-tailed distributions. In…

Computer Vision and Pattern Recognition · Computer Science 2022-07-05 Haotao Wang , Aston Zhang , Yi Zhu , Shuai Zheng , Mu Li , Alex Smola , Zhangyang Wang

Out-of-distribution (OOD) detection is vital to safety-critical machine learning applications and has thus been extensively studied, with a plethora of methods developed in the literature. However, the field currently lacks a unified,…

Computer Vision and Pattern Recognition · Computer Science 2022-10-14 Jingkang Yang , Pengyun Wang , Dejian Zou , Zitang Zhou , Kunyuan Ding , Wenxuan Peng , Haoqi Wang , Guangyao Chen , Bo Li , Yiyou Sun , Xuefeng Du , Kaiyang Zhou , Wayne Zhang , Dan Hendrycks , Yixuan Li , Ziwei Liu

Out-of-distribution (OOD) detection is essential for building reliable AI systems, as models that produce outputs for invalid inputs cannot be trusted. Although deep learning (DL) is often assumed to outperform traditional machine learning…

Computer Vision and Pattern Recognition · Computer Science 2026-05-21 Jihyeon Baek , Seunghoon Lee , Gitaek Kwon , Doohyun Park

Out-of-distribution (OOD) detection is a crucial part of deploying machine learning models safely. It has been extensively studied with a plethora of methods developed in the literature. This problem is tackled with an OOD score…

Computer Vision and Pattern Recognition · Computer Science 2024-01-19 Jingqiu Zhou , Aojun Zhou , Hongsheng Li

Deep neural networks are known to achieve superior results in classification tasks. However, it has been recently shown that they are incapable to detect examples that are generated by a distribution which is different than the one they…

Machine Learning · Computer Science 2019-12-09 Aristotelis-Angelos Papadopoulos , Nazim Shaikh , Mohammad Reza Rajati

Out-of-distribution (OOD) detection is essential for reliably deploying machine learning models in the wild. Yet, most methods treat large pre-trained models as monolithic encoders and rely solely on their final-layer representations for…

Computer Vision and Pattern Recognition · Computer Science 2025-10-21 I. M. De la Jara , C. Rodriguez-Opazo , D. Teney , D. Ranasinghe , E. Abbasnejad

Distinguishing in- and out-of-distribution (OOD) inputs is crucial for reliable deployment of classification systems. However, OOD data is typically unavailable or difficult to collect, posing a significant challenge for accurate OOD…

Computation and Language · Computer Science 2025-10-03 Momin Abbas , Muneeza Azmat , Raya Horesh , Mikhail Yurochkin