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Although precision and recall are standard performance measures for anomaly detection, their statistical properties in sequential detection settings are poorly understood. In this work, we formalize a notion of precision and recall with…

Machine Learning · Computer Science 2020-08-14 Erik Scharwächter , Emmanuel Müller

Out-of-distribution (OoD) inputs pose a persistent challenge to deep learning models, often triggering overconfident predictions on non-target objects. While prior work has primarily focused on refining scoring functions and adjusting…

Computer Vision and Pattern Recognition · Computer Science 2026-01-05 Changshun Wu , Weicheng He , Chih-Hong Cheng , Xiaowei Huang , Saddek Bensalem

We propose the gradient-weighted Object Detector Activation Maps (ODAM), a visualized explanation technique for interpreting the predictions of object detectors. Utilizing the gradients of detector targets flowing into the intermediate…

Computer Vision and Pattern Recognition · Computer Science 2023-04-14 Chenyang Zhao , Antoni B. Chan

Safe navigation of self-driving cars and robots requires a precise understanding of their environment. Training data for perception systems cannot cover the wide variety of objects that may appear during deployment. Thus, reliable…

Computer Vision and Pattern Recognition · Computer Science 2025-04-11 Alexey Nekrasov , Rui Zhou , Miriam Ackermann , Alexander Hermans , Bastian Leibe , Matthias Rottmann

In real-world applications, anomaly detection (AD) often operates without access to anomalous data, necessitating semi-supervised methods that rely solely on normal data. Among these methods, deep k-nearest neighbor (deep kNN) AD stands out…

Out-of-distribution (OOD) detection is essential for the reliability of ML models. Most existing methods for OOD detection learn a fixed decision criterion from a given in-distribution dataset and apply it universally to decide if a data…

Machine Learning · Computer Science 2023-11-29 YiFan Zhang , Xue Wang , Tian Zhou , Kun Yuan , Zhang Zhang , Liang Wang , Rong Jin , Tieniu Tan

Anomaly detection (AD) has garnered ample attention in security research, as such algorithms complement existing signature-based methods but promise detection of never-before-seen attacks. Cyber operations manage a high volume of…

Cryptography and Security · Computer Science 2017-10-27 Robert A. Bridges , Jessie D. Jamieson , Joel W. Reed

Deep neural networks (DNN) can achieve high performance when applied to In-Distribution (ID) data which come from the same distribution as the training set. When presented with anomaly inputs not from the ID, the outputs of a DNN should be…

Machine Learning · Computer Science 2021-10-08 Fangzhen Zhao , Chenyi Zhang , Naipeng Dong , Zefeng You , Zhenxin Wu

Video Anomaly Detection (VAD), which aims to detect anomalies that deviate from expectation, has attracted increasing attention in recent years. Existing advancements in VAD primarily focus on model architectures and training strategies,…

Computer Vision and Pattern Recognition · Computer Science 2025-11-03 Zihao Liu , Xiaoyu Wu , Wenna Li , Linlin Yang , Shengjin Wang

This paper introduces a new methodology for detecting anomalies in time series data, with a primary application to monitoring the health of (micro-) services and cloud resources. The main novelty in our approach is that instead of modeling…

Machine Learning · Computer Science 2020-07-31 Fadhel Ayed , Lorenzo Stella , Tim Januschowski , Jan Gasthaus

Performing anomaly detection in hybrid systems is a challenging task since it requires analysis of timing behavior and mutual dependencies of both discrete and continuous signals. Typically, it requires modeling system behavior, which is…

Machine Learning · Computer Science 2020-10-30 Nemanja Hranisavljevic , Oliver Niggemann , Alexander Maier

Anomaly detection is the task of identifying examples that do not behave as expected. Because anomalies are rare and unexpected events, collecting real anomalous examples is often challenging in several applications. In addition, learning…

Machine Learning · Computer Science 2024-05-24 Lorenzo Perini , Maja Rudolph , Sabrina Schmedding , Chen Qiu

One-way delay (OWD) between end hosts has important implications for Internet applications, protocols, and measurement-based analyses. We describe a new approach for identifying OWDs via passive measurement of Network Time Protocol (NTP)…

Networking and Internet Architecture · Computer Science 2018-01-09 Ramakrishnan Durairajan , Sathiya Kumaran Mani , Paul Barford , Rob Nowak , Joel Sommers

The curse of outlier measurements in estimation problems is a well known issue in a variety of fields. Therefore, outlier removal procedures, which enables the identification of spurious measurements within a set, have been developed for…

Information Theory · Computer Science 2017-08-02 Marco Compagnoni , Alessia Pini , Antonio Canclini , Paolo Bestagini , Fabio Antonacci , Stefano Tubaro , Augusto Sarti

Applying machine learning to increasingly high-dimensional problems with sparse or biased training data increases the risk that a model is used on inputs outside its training domain. For such out-of-distribution (OOD) inputs, the model can…

Machine Learning · Computer Science 2025-03-10 Juniper Tyree , Andreas Rupp , Petri S. Clusius , Michael H. Boy

Out-of-Distribution (OOD) detection is essential in real-world applications, which has attracted increasing attention in recent years. However, most existing OOD detection methods require many labeled In-Distribution (ID) data, causing a…

Machine Learning · Computer Science 2022-10-14 Yi-Xuan Sun , Wei Wang

With the advancement of Industry 4.0, intelligent manufacturing extensively employs sensors for real-time multidimensional data collection, playing a crucial role in equipment monitoring, process optimisation, and efficiency enhancement.…

Machine Learning · Computer Science 2025-03-18 Huajie Liang , Di Wang , Yuchao Lu , Mengke Song , Lei Liu , Ling An , Ying Liang , Xingjie Ma , Zhenyu Zhang , Chichun Zhou

Detecting anomalies in temporal data has gained significant attention across various real-world applications, aiming to identify unusual events and mitigate potential hazards. In practice, situations often involve a mix of segment-level…

Machine Learning · Computer Science 2025-01-22 Yaxuan Wang , Hao Cheng , Jing Xiong , Qingsong Wen , Han Jia , Ruixuan Song , Liyuan Zhang , Zhaowei Zhu , Yang Liu

Out-of-distribution (OOD) detection aims to detect test samples outside the training category space, which is an essential component in building reliable machine learning systems. Existing reviews on OOD detection primarily focus on method…

Machine Learning · Computer Science 2025-08-05 Shuo Lu , Yingsheng Wang , Lijun Sheng , Lingxiao He , Aihua Zheng , Jian Liang

Deep learning performs remarkably well on many time series analysis tasks recently. The superior performance of deep neural networks relies heavily on a large number of training data to avoid overfitting. However, the labeled data of many…

Machine Learning · Computer Science 2022-04-04 Qingsong Wen , Liang Sun , Fan Yang , Xiaomin Song , Jingkun Gao , Xue Wang , Huan Xu