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Outlier detection (OD) has received continuous research interests due to its wide applications. With the development of deep learning, increasingly deep OD algorithms are proposed. Despite the availability of numerous deep OD models,…

Machine Learning · Computer Science 2023-05-29 Yihong Huang , Yuang Zhang , Liping Wang , Xuemin Lin

Outlier detection (OD) literature exhibits numerous algorithms as it applies to diverse domains. However, given a new detection task, it is unclear how to choose an algorithm to use, nor how to set its hyperparameter(s) (HPs) in…

Machine Learning · Computer Science 2022-10-20 Xueying Ding , Lingxiao Zhao , Leman Akoglu

Out-of-Distribution (OOD) detection is a critical task that has garnered significant attention. The emergence of CLIP has spurred extensive research into zero-shot OOD detection, often employing a training-free approach. Current methods…

Computer Vision and Pattern Recognition · Computer Science 2026-01-21 Haoran Xu , Yanlin Liu , Zizhao Tong , Jiaze Li , Kexue Fu , Yuyang Zhang , Longxiang Gao , Shuaiguang Li , Xingyu Li , Yanran Xu , Changwei Wang

Machine Learning classifiers used in Brain-Computer Interfaces make classifications based on the distribution of data they were trained on. When they need to make inferences on samples that fall outside of this distribution, they can only…

Machine Learning · Computer Science 2026-03-17 Merlijn Quincent Mulder , Matias Valdenegro-Toro , Andreea Ioana Sburlea , Ivo Pascal de Jong

Overparameterized machine learning (ML) methods such as neural networks may be prohibitively resource intensive for devices with limited computational capabilities. Hyperdimensional computing (HDC) is an emerging resource efficient and…

Machine Learning · Computer Science 2026-03-05 Nikita Zeulin , Olga Galinina , Ravikumar Balakrishnan , Nageen Himayat , Sergey Andreev

Hyperdimensional Computing (HDC) is a bio-inspired computing framework that has gained increasing attention, especially as a more efficient approach to machine learning (ML). This work introduces the \name{} compiler, the first open-source…

Machine Learning · Computer Science 2023-04-26 Pere Vergés , Mike Heddes , Igor Nunes , Tony Givargis , Alexandru Nicolau

This paper introduces a novel family of outlier detection algorithms based on Cluster Catch Digraphs (CCDs), specifically tailored to address the challenges of high dimensionality and varying cluster shapes, which deteriorate the…

Machine Learning · Statistics 2024-10-10 Rui Shi , Nedret Billor , Elvan Ceyhan

Out-of-distribution (OOD) detection is a critical requirement for the deployment of deep neural networks. This paper introduces the HEAT model, a new post-hoc OOD detection method estimating the density of in-distribution (ID) samples using…

Computer Vision and Pattern Recognition · Computer Science 2023-08-21 Marc Lafon , Elias Ramzi , Clément Rambour , Nicolas Thome

Many neural network-based out-of-distribution (OoD) detection methods have been proposed. However, they require many training data for each target task. We propose a simple yet effective meta-learning method to detect OoD with small…

Machine Learning · Statistics 2022-06-22 Tomoharu Iwata , Atsutoshi Kumagai

Hyperdimensional computing (HDC) suits memory, energy, and reliability-constrained systems, yet the standard "one prototype per class" design requires $O(CD)$ memory (with $C$ classes and dimensionality $D$). Prior compaction reduces $D$…

Machine Learning · Computer Science 2026-02-04 Sanggeon Yun , Hyunwoo Oh , Ryozo Masukawa , Pietro Mercati , Nathaniel D. Bastian , Mohsen Imani

Recognizing out-of-distribution (OOD) samples is critical for machine learning systems deployed in the open world. The vast majority of OOD detection methods are driven by a single modality (e.g., either vision or language), leaving the…

Computer Vision and Pattern Recognition · Computer Science 2022-11-28 Yifei Ming , Ziyang Cai , Jiuxiang Gu , Yiyou Sun , Wei Li , Yixuan Li

As deep learning methods form a critical part in commercially important applications such as autonomous driving and medical diagnostics, it is important to reliably detect out-of-distribution (OOD) inputs while employing these algorithms.…

Machine Learning · Computer Science 2018-09-12 Apoorv Vyas , Nataraj Jammalamadaka , Xia Zhu , Dipankar Das , Bharat Kaul , Theodore L. Willke

Out-of-distribution (OOD) detection is an indispensable aspect of secure AI when deploying machine learning models in real-world applications. Previous paradigms either explore better scoring functions or utilize the knowledge of outliers…

Machine Learning · Computer Science 2023-06-07 Jianing Zhu , Hengzhuang Li , Jiangchao Yao , Tongliang Liu , Jianliang Xu , Bo Han

On-device learning has emerged as a prevailing trend that avoids the slow response time and costly communication of cloud-based learning. The ability to learn continuously and indefinitely in a changing environment, and with resource…

Machine Learning · Computer Science 2024-03-08 Xiaofan Yu , Anthony Thomas , Ivannia Gomez Moreno , Louis Gutierrez , Tajana Rosing

Cybersecurity has emerged as a critical challenge for the industry. With the large complexity of the security landscape, sophisticated and costly deep learning models often fail to provide timely detection of cyber threats on edge devices.…

Cryptography and Security · Computer Science 2023-04-17 Junyao Wang , Hanning Chen , Mariam Issa , Sitao Huang , Mohsen Imani

Outlier detection (OD) is a key machine learning (ML) task for identifying abnormal objects from general samples with numerous high-stake applications including fraud detection and intrusion detection. Due to the lack of ground truth…

On-device continual learning (CL) is critical for edge AI systems operating on non-stationary data streams, but most existing methods rely on backpropagation or exemplar-heavy classifiers, incurring substantial compute, memory, and latency…

Computer Vision and Pattern Recognition · Computer Science 2026-04-24 Jebacyril Arockiaraj , Dhruv Parikh , Viktor Prasanna

Thanks to the tiny storage and efficient execution, hyperdimensional Computing (HDC) is emerging as a lightweight learning framework on resource-constrained hardware. Nonetheless, the existing HDC training relies on various heuristic…

Machine Learning · Computer Science 2022-04-04 Shijin Duan , Yejia Liu , Shaolei Ren , Xiaolin Xu

We present different methods of unsupervised learning which can be used for outlier detection in high energy nuclear collisions. The UrQMD model is used to generate the bulk background of events as well as different variants of outlier…

High Energy Physics - Experiment · Physics 2021-05-26 Punnathat Thaprasop , Kai Zhou , Jan Steinheimer , Christoph Herold

Over the past few years, silicon photonics-based computing has emerged as a promising alternative to CMOS-based computing for Deep Neural Networks (DNN). Unfortunately, the non-linear operations and the high-precision requirements of DNNs…