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Reconstruction error-based neural architectures constitute a classical deep learning approach to anomaly detection which has shown great performances. It consists in training an Autoencoder to reconstruct a set of examples deemed to…

机器学习 · 计算机科学 2024-06-06 Fabrizio Angiulli , Fabio Fassetti , Luca Ferragina

Anomaly detection is being regarded as an unsupervised learning task as anomalies stem from adversarial or unlikely events with unknown distributions. However, the predictive performance of purely unsupervised anomaly detection often fails…

机器学习 · 计算机科学 2014-01-27 Nico Goernitz , Marius Micha Kloft , Konrad Rieck , Ulf Brefeld

We propose the Autoencoding Binary Classifiers (ABC), a novel supervised anomaly detector based on the Autoencoder (AE). There are two main approaches in anomaly detection: supervised and unsupervised. The supervised approach accurately…

机器学习 · 统计学 2019-03-27 Yuki Yamanaka , Tomoharu Iwata , Hiroshi Takahashi , Masanori Yamada , Sekitoshi Kanai

Due to the limited availability of anomalous samples for training, video anomaly detection is commonly viewed as a one-class classification problem. Many prevalent methods investigate the reconstruction difference produced by AutoEncoders…

计算机视觉与模式识别 · 计算机科学 2023-03-10 Xiangyu Huang , Caidan Zhao , Chenxing Gao , Lvdong Chen , Zhiqiang Wu

In today's digital world, the generation of vast amounts of streaming data in various domains has become ubiquitous. However, many of these data are unlabeled, making it challenging to identify events, particularly anomalies. This task…

机器学习 · 计算机科学 2026-02-16 Jin Li , Kleanthis Malialis , Christos G. Panayiotou , Marios M. Polycarpou

Visual anomaly detection in real-world industrial settings faces two major limitations. First, most existing methods are trained on purely normal data or on unlabeled datasets assumed to be predominantly normal, presuming the absence of…

计算机视觉与模式识别 · 计算机科学 2026-02-05 Anindya Sundar Das , Monowar Bhuyan

We consider the problem of detecting, in the visual sensing data stream of an autonomous mobile robot, semantic patterns that are unusual (i.e., anomalous) with respect to the robot's previous experience in similar environments. These…

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…

机器学习 · 计算机科学 2025-01-22 Yaxuan Wang , Hao Cheng , Jing Xiong , Qingsong Wen , Han Jia , Ruixuan Song , Liyuan Zhang , Zhaowei Zhu , Yang Liu

In our digital universe nowadays, enormous amount of data are produced in a streaming manner in a variety of application areas. These data are often unlabelled. In this case, identifying infrequent events, such as anomalies, poses a great…

机器学习 · 计算机科学 2023-09-07 Jin Li , Kleanthis Malialis , Marios M. Polycarpou

Through training on unlabeled data, anomaly detection has the potential to impact computer-aided diagnosis by outlining suspicious regions. Previous work on deep-learning-based anomaly detection has primarily focused on the reconstruction…

图像与视频处理 · 电气工程与系统科学 2019-12-03 David Zimmerer , Jens Petersen , Simon A. A. Kohl , Klaus H. Maier-Hein

Due to the growing amount of data from in-situ sensors in wastewater systems, it becomes necessary to automatically identify abnormal behaviours and ensure high data quality. This paper proposes an anomaly detection method based on a deep…

信号处理 · 电气工程与系统科学 2020-03-09 Stefania Russo , Andy Disch , Frank Blumensaat , Kris Villez

Weakly supervised video anomaly detection aims to identify abnormal events in videos using only video-level labels. Recently, two-stage self-training methods have achieved significant improvements by self-generating pseudo labels and…

计算机视觉与模式识别 · 计算机科学 2022-12-09 Chen Zhang , Guorong Li , Yuankai Qi , Shuhui Wang , Laiyun Qing , Qingming Huang , Ming-Hsuan Yang

We introduce an adaptive method with formal quality guarantees for weak supervision in a non-stationary setting. Our goal is to infer the unknown labels of a sequence of data by using weak supervision sources that provide independent noisy…

机器学习 · 计算机科学 2025-05-05 Alessio Mazzetto , Reza Esfandiarpoor , Akash Singirikonda , Eli Upfal , Stephen H. Bach

Unsupervised anomaly detection models which are trained solely by healthy data, have gained importance in the recent years, as the annotation of medical data is a tedious task. Autoencoders and generative adversarial networks are the…

计算机视觉与模式识别 · 计算机科学 2022-12-12 Marc Dietrichstein , David Major , Martin Trapp , Maria Wimmer , Dimitrios Lenis , Philip Winter , Astrid Berg , Theresa Neubauer , Katja Bühler

Anomaly detection is referred to as a process in which the aim is to detect data points that follow a different pattern from the majority of data points. Anomaly detection methods suffer from several well-known challenges that hinder their…

机器学习 · 计算机科学 2021-08-31 Kasra Babaei , Zhi Yuan Chen , Tomas Maul

Existing anomaly detection paradigms overwhelmingly focus on training detection models using exclusively normal data or unlabeled data (mostly normal samples). One notorious issue with these approaches is that they are weak in…

计算机视觉与模式识别 · 计算机科学 2021-08-03 Guansong Pang , Choubo Ding , Chunhua Shen , Anton van den Hengel

Anomaly detection in tabular data remains challenging due to complex feature interactions and the scarcity of anomalous examples. Denoising autoencoders rely on fixed-magnitude noise, limiting adaptability to diverse data distributions.…

机器学习 · 计算机科学 2025-08-04 Timur Sattarov , Marco Schreyer , Damian Borth

In the contemporary digital landscape, the continuous generation of extensive streaming data across diverse domains has become pervasive. Yet, a significant portion of this data remains unlabeled, posing a challenge in identifying…

计算工程、金融与科学 · 计算机科学 2025-08-25 Jin Li , Kleanthis Malialis , Christos G. Panayiotou , Marios M. Polycarpou

Unsupervised Anomaly Detection has become a popular method to detect pathologies in medical images as it does not require supervision or labels for training. Most commonly, the anomaly detection model generates a "normal" version of an…

图像与视频处理 · 电气工程与系统科学 2023-09-26 Felix Meissen , Johannes Paetzold , Georgios Kaissis , Daniel Rueckert

Falsely annotated samples, also known as noisy labels, can significantly harm the performance of deep learning models. Two main approaches for learning with noisy labels are global noise estimation and data filtering. Global noise…

机器学习 · 计算机科学 2025-07-31 Yuval Grinberg , Nimrod Harel , Jacob Goldberger , Ofir Lindenbaum