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Unsupervised learning can leverage large-scale data sources without the need for annotations. In this context, deep learning-based autoencoders have shown great potential in detecting anomalies in medical images. However, especially…

Image and Video Processing · Electrical Eng. & Systems 2020-01-03 David Zimmerer , Simon Kohl , Jens Petersen , Fabian Isensee , Klaus Maier-Hein

Autoencoder (AE) is a neural network (NN) architecture that is trained to reconstruct an input at its output. By measuring the reconstruction errors of new input samples, AE can detect anomalous samples deviated from the trained data…

Machine Learning · Computer Science 2023-02-16 Jinho Choi , Jihong Park , Abhinav Japesh , Adarsh

Dimensionality reduction is a crucial first step for many unsupervised learning tasks including anomaly detection and clustering. Autoencoder is a popular mechanism to accomplish dimensionality reduction. In order to make dimensionality…

Machine Learning · Computer Science 2021-03-12 Imtiaz Ahmed , Travis Galoppo , Xia Hu , Yu Ding

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…

Machine Learning · Statistics 2019-03-27 Yuki Yamanaka , Tomoharu Iwata , Hiroshi Takahashi , Masanori Yamada , Sekitoshi Kanai

Autoencoder can give rise to an appropriate latent representation of the input data, however, the representation which is solely based on the intrinsic property of the input data, is usually inferior to express some semantic information. A…

Machine Learning · Computer Science 2022-06-01 Yurui Ming , Cuihuan Du , Chin-Teng Lin

This proposed model introduces novel deep learning methodologies. The objective here is to create a reliable intrusion detection mechanism to help identify malicious attacks. Deep learning based solution framework is developed consisting of…

Networking and Internet Architecture · Computer Science 2023-10-26 Arun Kumar Silivery , Ram Mohan Rao Kovvur

Unsupervised multivariate time series (MTS) representation learning aims to extract compact and informative representations from raw sequences without relying on labels, enabling efficient transfer to diverse downstream tasks. In this…

Machine Learning · Computer Science 2025-09-22 Yi Xu , Yitian Zhang , Yun Fu

This paper explores the application of unsupervised learning to detecting anomalies in mouse video data. The two models presented in this paper are a dual-stream, 3D convolutional autoencoder (with residual connections) and a dual-stream,…

Computer Vision and Pattern Recognition · Computer Science 2021-06-02 Ezechukwu I Nwokedi , Rasneer S Bains , Luc Bidaut , Sara Wells , Xujiong Ye , James M Brown

Insider attacks are one of the most challenging cybersecurity issues for companies, businesses and critical infrastructures. Despite the implemented perimeter defences, the risk of this kind of attack is still very high. In fact, the…

Cryptography and Security · Computer Science 2021-09-07 Efthimios Pantelidis , Gueltoum Bendiab , Stavros Shiaeles , Nicholas Kolokotronis

Recently, Provenance-based Intrusion Detection Systems (PIDSes) have been widely used for endpoint threat analysis. These studies can be broadly categorized into rule-based detection systems and learning-based detection systems. Among…

Cryptography and Security · Computer Science 2025-07-23 Wenrui Cheng , Tiantian Zhu , Shunan Jing , Jian-Ping Mei , Mingjun Ma , Jiaobo Jin , Zhengqiu Weng

Anomaly detection in SDN using data flow prediction is a difficult task. This problem is included in the category of time series and regression problems. Machine learning approaches are challenging in this field due to the manual selection…

Machine Learning · Computer Science 2024-02-12 Sajjad Salem , Salman Asoudeh

Autoencoder, as an essential part of many anomaly detection methods, is lacking flexibility on normal data in complex datasets. U-Net is proved to be effective for this purpose but overfits on the training data if trained by just using…

Computer Vision and Pattern Recognition · Computer Science 2022-02-14 Mohammadreza Salehi , Ainaz Eftekhar , Niousha Sadjadi , Mohammad Hossein Rohban , Hamid R. Rabiee

Network traffic classification is the basis of many network security applications and has attracted enough attention in the field of cyberspace security. Existing network traffic classification based on convolutional neural networks (CNNs)…

Machine Learning · Computer Science 2023-09-12 Yu Zheng , Zhangxuan Dang , Chunlei Peng , Chao Yang , Xinbo Gao

Federated learning is a machine learning paradigm in which multiple devices collaboratively train a model under the supervision of a central server while ensuring data privacy. However, its performance is often hindered by redundant,…

Computer Vision and Pattern Recognition · Computer Science 2026-04-30 Emre Ardıç , Yakup Genç

As computer networks proliferate, the gravity of network intrusions has escalated, emphasizing the criticality of network intrusion detection systems for safeguarding security. While deep learning models have exhibited promising results in…

Cryptography and Security · Computer Science 2025-05-21 Yifan Zeng

Fraud in healthcare is widespread, as doctors could prescribe unnecessary treatments to increase bills. Insurance companies want to detect these anomalous fraudulent bills and reduce their losses. Traditional fraud detection methods use…

Machine Learning · Computer Science 2020-10-13 Victoria Snorovikhina , Alexey Zaytsev

Autoencoders are a type of unsupervised neural networks, which can be used to solve various tasks, e.g., dimensionality reduction, image compression, and image denoising. An AE has two goals: (i) compress the original input to a…

Computer Vision and Pattern Recognition · Computer Science 2022-11-24 Firas Laakom , Jenni Raitoharju , Alexandros Iosifidis , Moncef Gabbouj

This paper introduces an innovative intrusion detection system that harnesses Generative Adversarial Networks (GANs), Multi-Scale Convolutional Neural Networks (MSCNNs), and Bidirectional Long Short-Term Memory (BiLSTM) networks,…

Cryptography and Security · Computer Science 2024-06-11 Asmaa Benchama , Khalid Zebbara

In recent years, rapid technological advancements and expanded Internet access have led to a significant rise in anomalies within network traffic and time-series data. Prompt detection of these irregularities is crucial for ensuring service…

Machine Learning · Computer Science 2025-11-10 Mahshid Rezakhani , Tolunay Seyfi , Fatemeh Afghah

In this paper, we focus on addressing the challenges of detecting malicious attacks in networks by designing an advanced Explainable Intrusion Detection System (xIDS). The existing machine learning and deep learning approaches have…

Cryptography and Security · Computer Science 2025-03-04 Muhammad Adil , Mian Ahmad Jan , Safayat Bin Hakim , Houbing Herbert Song , Zhanpeng Jin
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