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Anomaly detection is a fundamental problem in computer vision area with many real-world applications. Given a wide range of images belonging to the normal class, emerging from some distribution, the objective of this task is to construct…

Computer Vision and Pattern Recognition · Computer Science 2020-07-15 Chengwei Chen , Pan Chen , Haichuan Song , Yiqing Tao , Yuan Xie , Shouhong Ding , Lizhuang Ma

We propose a novel unsupervised generative model that learns to disentangle object identity from other low-level aspects in class-imbalanced data. We first investigate the issues surrounding the assumptions about uniformity made by InfoGAN,…

Machine Learning · Computer Science 2020-11-02 Utkarsh Ojha , Krishna Kumar Singh , Cho-Jui Hsieh , Yong Jae Lee

The one-class classification problem is a well-known research endeavor in pattern recognition. The problem is also known under different names, such as outlier and novelty/anomaly detection. The core of the problem consists in modeling and…

Computer Vision and Pattern Recognition · Computer Science 2015-03-31 Lorenzo Livi , Alireza Sadeghian , Witold Pedrycz

Disentangled generative models map a latent code vector to a target space, while enforcing that a subset of the learned latent codes are interpretable and associated with distinct properties of the target distribution. Recent advances have…

Machine Learning · Computer Science 2020-08-10 Zinan Lin , Kiran Koshy Thekumparampil , Giulia Fanti , Sewoong Oh

Although data generation is often straightforward, extracting information from data is more difficult. Object-centric representation learning can extract information from images in an unsupervised manner. It does so by segmenting an image…

Computer Vision and Pattern Recognition · Computer Science 2026-03-03 Joël Küchler , Ellen van Maren , Vaiva Vasiliauskaitė , Katarina Vulić , Reza Abbasi-Asl , Stephan J. Ihle

Nowadays, graph-structured data are increasingly used to model complex systems. Meanwhile, detecting anomalies from graph has become a vital research problem of pressing societal concerns. Anomaly detection is an unsupervised learning task…

Machine Learning · Computer Science 2021-03-29 Xuhong Wang , Baihong Jin , Ying Du , Ping Cui , Yupu Yang

We study the problem of learning generative adversarial networks (GANs) for a rare class of an unlabeled dataset subject to a labeling budget. This problem is motivated from practical applications in domains including security (e.g.,…

Machine Learning · Computer Science 2022-03-22 Zinan Lin , Hao Liang , Giulia Fanti , Vyas Sekar

Anomaly detection is often considered a challenging field of machine learning due to the difficulty of obtaining anomalous samples for training and the need to obtain a sufficient amount of training data. In recent years, autoencoders have…

Machine Learning · Computer Science 2018-10-15 Yotam Intrator , Gilad Katz , Asaf Shabtai

We propose a novel way of solving the issue of classification of out-of-vocabulary gestures using Artificial Neural Networks (ANNs) trained in the Generative Adversarial Network (GAN) framework. A generative model augments the data set in…

Machine Learning · Computer Science 2023-04-14 Miguel Simão , Pedro Neto , Olivier Gibaru

Multi-class novelty detection is increasingly becoming an important area of research due to the continuous increase in the number of object categories. It tries to answer the pertinent question: given a test sample, should we even try to…

Computer Vision and Pattern Recognition · Computer Science 2020-01-03 Supritam Bhattacharjee , Devraj Mandal , Soma Biswas

Novelty detection is the task of recognizing samples that do not belong to the distribution of the target class. During training, the novelty class is absent, preventing the use of traditional classification approaches. Deep autoencoders…

Computer Vision and Pattern Recognition · Computer Science 2021-11-11 John Taylor Jewell , Vahid Reza Khazaie , Yalda Mohsenzadeh

The network intrusion detection task is challenging because of the imbalanced and unlabeled nature of the dataset it operates on. Existing generative adversarial networks (GANs), are primarily used for creating synthetic samples from reals.…

Machine Learning · Computer Science 2022-03-09 Wen Xu , Julian Jang-Jaccard , Tong Liu , Fariza Sabrina

This study presents an adversarial method for anomaly detection in real-world applications, leveraging the power of generative adversarial neural networks (GANs) through cycle consistency in reconstruction error. Previous methods suffer…

Machine Learning · Computer Science 2024-05-01 Zahra Dehghanian , Saeed Saravani , Maryam Amirmazlaghani , Mohammad Rahmati

Utilization of classification latent space information for downstream reconstruction and generation is an intriguing and a relatively unexplored area. In general, discriminative representations are rich in class-specific features but are…

Entity resolution targets at identifying records that represent the same real-world entity from one or more datasets. A major challenge in learning-based entity resolution is how to reduce the label cost for training. Due to the quadratic…

Machine Learning · Computer Science 2020-12-21 Jingyu Shao , Qing Wang , Asiri Wijesinghe , Erhard Rahm

From a safety perspective, a machine learning method embedded in real-world applications is required to distinguish irregular situations. For this reason, there has been a growing interest in the anomaly detection (AD) task. Since we cannot…

Machine Learning · Computer Science 2021-04-21 JuneKyu Park , Jeong-Hyeon Moon , Namhyuk Ahn , Kyung-Ah Sohn

Disentangling factors of variation has become a very challenging problem on representation learning. Existing algorithms suffer from many limitations, such as unpredictable disentangling factors, poor quality of generated images from…

Computer Vision and Pattern Recognition · Computer Science 2018-03-29 Taihong Xiao , Jiapeng Hong , Jinwen Ma

The advent of Generative Adversarial Networks (GANs) has brought about completely novel ways of transforming and manipulating pixels in digital images. GAN based techniques such as Image-to-Image translations, DeepFakes, and other automated…

Computer Vision and Pattern Recognition · Computer Science 2019-10-04 Lakshmanan Nataraj , Tajuddin Manhar Mohammed , Shivkumar Chandrasekaran , Arjuna Flenner , Jawadul H. Bappy , Amit K. Roy-Chowdhury , B. S. Manjunath

Many existing conditional Generative Adversarial Networks (cGANs) are limited to conditioning on pre-defined and fixed class-level semantic labels or attributes. We propose an open set GAN architecture (OpenGAN) that is conditioned…

Computer Vision and Pattern Recognition · Computer Science 2020-03-19 Luke Ditria , Benjamin J. Meyer , Tom Drummond

In generative modeling, numerous successful approaches leverage a low-dimensional latent space, e.g., Stable Diffusion models the latent space induced by an encoder and generates images through a paired decoder. Although the selection of…

Machine Learning · Computer Science 2023-10-31 Tianyang Hu , Fei Chen , Haonan Wang , Jiawei Li , Wenjia Wang , Jiacheng Sun , Zhenguo Li