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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

This paper presents a novel evaluation framework for Out-of-Distribution (OOD) detection that aims to assess the performance of machine learning models in more realistic settings. We observed that the real-world requirements for testing OOD…

Computer Vision and Pattern Recognition · Computer Science 2023-09-01 Vahid Reza Khazaie , Anthony Wong , Mohammad Sabokrou

Most existing out-of-distribution (OOD) detection benchmarks classify samples with novel labels as the OOD data. However, some marginal OOD samples actually have close semantic contents to the in-distribution (ID) sample, which makes…

Computer Vision and Pattern Recognition · Computer Science 2024-11-01 Xingming Long , Jie Zhang , Shiguang Shan , Xilin Chen

Out-of-distribution (OOD) detection, which maps high-dimensional data into a scalar OOD score, is critical for the reliable deployment of machine learning models. A key challenge in recent research is how to effectively leverage and…

Machine Learning · Computer Science 2026-02-06 Claus Hofmann , Christian Huber , Bernhard Lehner , Daniel Klotz , Sepp Hochreiter , Werner Zellinger

Deep neural networks (DNNs) for the semantic segmentation of images are usually trained to operate on a predefined closed set of object classes. This is in contrast to the "open world" setting where DNNs are envisioned to be deployed to.…

Computer Vision and Pattern Recognition · Computer Science 2021-07-28 Robin Chan , Matthias Rottmann , Hanno Gottschalk

Successful detection of Out-of-Distribution (OoD) data is becoming increasingly important to ensure safe deployment of neural networks. One of the main challenges in OoD detection is that neural networks output overconfident predictions on…

Computer Vision and Pattern Recognition · Computer Science 2023-10-26 Sangha Park , Jisoo Mok , Dahuin Jung , Saehyung Lee , Sungroh Yoon

Vision-language models (VLMs) such as CLIP exhibit strong Out-of-distribution (OOD) detection capabilities by aligning visual and textual representations. Recent CLIP-based test-time adaptation methods further improve detection performance…

Computation and Language · Computer Science 2026-04-20 Jinlun Ye , Jiang Liao , Runhe Lai , Xinhua Lu , Jiaxin Zhuang , Zhiyong Gan , Ruixuan Wang

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 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

Deep Learning models are easily disturbed by variations in the input images that were not observed during the training stage, resulting in unpredictable predictions. Detecting such Out-of-Distribution (OOD) images is particularly crucial in…

Computer Vision and Pattern Recognition · Computer Science 2023-07-31 Benjamin Lambert , Florence Forbes , Senan Doyle , Michel Dojat

While deep learning demonstrates its strong ability to handle independent and identically distributed (IID) data, it often suffers from out-of-distribution (OoD) generalization, where the test data come from another distribution (w.r.t. the…

Machine Learning · Computer Science 2020-12-18 Haoyue Bai , Rui Sun , Lanqing Hong , Fengwei Zhou , Nanyang Ye , Han-Jia Ye , S. -H. Gary Chan , Zhenguo Li

Given a classifier, the inherent property of semantic Out-of-Distribution (OOD) samples is that their contents differ from all legal classes in terms of semantics, namely semantic mismatch. There is a recent work that directly applies it to…

Computer Vision and Pattern Recognition · Computer Science 2023-08-17 Ruiyuan Gao , Chenchen Zhao , Lanqing Hong , Qiang Xu

Deep Learning (DL) models tend to perform poorly when the data comes from a distribution different from the training one. In critical applications such as medical imaging, out-of-distribution (OOD) detection helps to identify such data…

Image and Video Processing · Electrical Eng. & Systems 2023-06-26 Daria Frolova , Anton Vasiliuk , Mikhail Belyaev , Boris Shirokikh

We consider the problem of detecting OoD(Out-of-Distribution) input data when using deep neural networks, and we propose a simple yet effective way to improve the robustness of several popular OoD detection methods against label shift. Our…

Machine Learning · Computer Science 2022-07-04 Matteo Guarrera , Baihong Jin , Tung-Wei Lin , Maria Zuluaga , Yuxin Chen , Alberto Sangiovanni-Vincentelli

In the dynamic realms of machine learning and deep learning, the robustness and reliability of models are paramount, especially in critical real-world applications. A fundamental challenge in this sphere is managing Out-of-Distribution…

Machine Learning · Computer Science 2024-03-07 Yingrui Ji , Yao Zhu , Zhigang Li , Jiansheng Chen , Yunlong Kong , Jingbo Chen

Out-of-distribution (OOD) detection and segmentation are crucial for deploying machine learning models in safety-critical applications such as autonomous driving and robot-assisted surgery. While prior research has primarily focused on…

Computer Vision and Pattern Recognition · Computer Science 2026-03-05 Moru Liu , Hao Dong , Jessica Kelly , Olga Fink , Mario Trapp

Recent developments for Semi-Supervised Object Detection (SSOD) have shown the promise of leveraging unlabeled data to improve an object detector. However, thus far these methods have assumed that the unlabeled data does not contain…

Computer Vision and Pattern Recognition · Computer Science 2022-08-30 Yen-Cheng Liu , Chih-Yao Ma , Xiaoliang Dai , Junjiao Tian , Peter Vajda , Zijian He , Zsolt Kira

Accessing machine learning models through remote APIs has been gaining prevalence following the recent trend of scaling up model parameters for increased performance. Even though these models exhibit remarkable ability, detecting…

Machine Learning · Computer Science 2024-08-20 Heeyoung Lee , Hoyoon Byun , Changdae Oh , JinYeong Bak , Kyungwoo Song

Systematics contaminate observables, leading to distribution shifts relative to theoretically simulated signals-posing a major challenge for using pre-trained models to label such observables. Since systematics are often poorly understood…

Instrumentation and Methods for Astrophysics · Physics 2025-11-18 Sultan Hassan , Sambatra Andrianomena , Benjamin D. Wandelt

Since the seminal paper of Hendrycks et al. arXiv:1610.02136, Post-hoc deep Out-of-Distribution (OOD) detection has expanded rapidly. As a result, practitioners working on safety-critical applications and seeking to improve the robustness…

Machine Learning · Statistics 2024-07-11 Paul Novello , Yannick Prudent , Joseba Dalmau , Corentin Friedrich , Yann Pequignot