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Detecting out-of-distribution (OOD) inputs is a critical safeguard for deploying machine learning models in the real world. However, most post-hoc detection methods operate on penultimate feature representations derived from global average…

Computer Vision and Pattern Recognition · Computer Science 2026-04-24 Abid Hassan , Tuan Ngo , Saad Shafiq , Nenad Medvidovic

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

Out-of-distribution (OOD) detection is essential to improve the reliability of machine learning models by detecting samples that do not belong to the training distribution. Detecting OOD samples effectively in certain tasks can pose a…

Computer Vision and Pattern Recognition · Computer Science 2023-11-02 Divyanshu Mishra , He Zhao , Pramit Saha , Aris T. Papageorghiou , J. Alison Noble

Out-of-distribution (OOD) detection plays a vital role in enhancing the reliability of machine learning (ML) models. The emergence of large language models (LLMs) has catalyzed a paradigm shift within the ML community, showcasing their…

Computation and Language · Computer Science 2024-04-17 Bo Liu , Liming Zhan , Zexin Lu , Yujie Feng , Lei Xue , Xiao-Ming Wu

It is important to quantify the uncertainty of input samples, especially in mission-critical domains such as autonomous driving and healthcare, where failure predictions on out-of-distribution (OOD) data are likely to cause big problems.…

Computer Vision and Pattern Recognition · Computer Science 2023-03-27 Yong Hyun Ahn , Gyeong-Moon Park , Seong Tae Kim

One key challenge in Out-of-Distribution (OOD) detection is the absence of ground-truth OOD samples during training. One principled approach to address this issue is to use samples from external datasets as outliers (i.e., pseudo OOD…

Computer Vision and Pattern Recognition · Computer Science 2024-11-26 Wenjun Miao , Guansong Pang , Jin Zheng , Xiao Bai

Out-of-distribution (OOD) detection is crucial for the deployment of machine learning models in the open world. While existing OOD detectors are effective in identifying OOD samples that deviate significantly from in-distribution (ID) data,…

Machine Learning · Computer Science 2024-12-10 Hao Fu , Prashanth Krishnamurthy , Siddharth Garg , Farshad Khorrami

Detecting out-of-distribution examples is important for safety-critical machine learning applications such as detecting novel biological phenomena and self-driving cars. However, existing research mainly focuses on simple small-scale…

Computer Vision and Pattern Recognition · Computer Science 2022-05-17 Dan Hendrycks , Steven Basart , Mantas Mazeika , Andy Zou , Joe Kwon , Mohammadreza Mostajabi , Jacob Steinhardt , Dawn Song

Using the intuition that out-of-distribution data have lower likelihoods, a common approach for out-of-distribution detection involves estimating the underlying data distribution. Normalizing flows are likelihood-based generative models…

Machine Learning · Computer Science 2025-01-30 Seyedeh Fatemeh Razavi , Mohammad Mahdi Mehmanchi , Reshad Hosseini , Mostafa Tavassolipour

Deep neural networks suffer from the overconfidence issue in the open world, meaning that classifiers could yield confident, incorrect predictions for out-of-distribution (OOD) samples. Thus, it is an urgent and challenging task to detect…

Computer Vision and Pattern Recognition · Computer Science 2022-04-12 Qiuyu Zhu , Guohui Zheng , Yingying Yan

A serious problem in image classification is that a trained model might perform well for input data that originates from the same distribution as the data available for model training, but performs much worse for out-of-distribution (OOD)…

Computer Vision and Pattern Recognition · Computer Science 2021-12-07 Rajat Koner , Poulami Sinhamahapatra , Karsten Roscher , Stephan Günnemann , Volker Tresp

In the field of out-of-distribution (OOD) detection, a previous method that use auxiliary data as OOD data has shown promising performance. However, the method provides an equal loss to all auxiliary data to differentiate them from inliers.…

Computer Vision and Pattern Recognition · Computer Science 2023-06-21 Hyunjun Choi , Hawook Jeong , Jin Young Choi

Most deep-learning-based image classification methods assume that all samples are generated under an independent and identically distributed (IID) setting. However, out-of-distribution (OOD) generalization is more common in practice, which…

Machine Learning · Computer Science 2022-02-24 Xin Guo , Zhengxu Yu , Chao Xiang , Zhongming Jin , Jianqiang Huang , Deng Cai , Xiaofei He , Xian-Sheng Hua

Out-of-distribution (OOD) detection is critical to ensuring the reliability of deep learning applications and has attracted significant attention in recent years. A rich body of literature has emerged to develop efficient score functions…

Machine Learning · Computer Science 2025-07-22 Yuhang Liu , Yuefei Wu , Bin Shi , Bo Dong

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)…

Machine Learning · Computer Science 2024-01-19 Anish Lakkapragada , Amol Khanna , Edward Raff , Nathan Inkawhich

Identifying Out-of-distribution (OOD) data is becoming increasingly critical as the real-world applications of deep learning methods expand. Post-hoc methods modify softmax scores fine-tuned on outlier data or leverage intermediate feature…

Computer Vision and Pattern Recognition · Computer Science 2024-07-16 Saandeep Aathreya , Shaun Canavan

Out-of-distribution (OOD) detection aims to identify OOD data based on representations extracted from well-trained deep models. However, existing methods largely ignore the reprogramming property of deep models and thus may not fully…

Machine Learning · Computer Science 2022-10-28 Qizhou Wang , Feng Liu , Yonggang Zhang , Jing Zhang , Chen Gong , Tongliang Liu , Bo Han

Out-of-distribution (OOD) detection lies at the heart of robust artificial intelligence (AI), aiming to identify samples from novel distributions beyond the training set. Recent approaches have exploited feature representations as…

Machine Learning · Computer Science 2025-08-06 Tarhib Al Azad , Faizul Rakib Sayem , Shahana Ibrahim

Detecting out-of-distribution (OOD) samples is vital for developing machine learning based models for critical safety systems. Common approaches for OOD detection assume access to some OOD samples during training which may not be available…

Machine Learning · Computer Science 2021-10-19 Koby Bibas , Meir Feder , Tal Hassner

Out-of-distribution (OOD) detection methods often exploit auxiliary outliers to train model identifying OOD samples, especially discovering challenging outliers from auxiliary outliers dataset to improve OOD detection. However, they may…

Computer Vision and Pattern Recognition · Computer Science 2024-03-25 Yichen Bai , Zongbo Han , Changqing Zhang , Bing Cao , Xiaoheng Jiang , Qinghua Hu