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We present a self-supervised learning (SSL) method suitable for semi-global tasks such as object detection and semantic segmentation. We enforce local consistency between self-learned features, representing corresponding image locations of…

Computer Vision and Pattern Recognition · Computer Science 2022-12-09 Ashraful Islam , Ben Lundell , Harpreet Sawhney , Sudipta Sinha , Peter Morales , Richard J. Radke

Contrastive learning has emerged as a powerful method in deep learning, excelling at learning effective representations through contrasting samples from different distributions. However, dimensional collapse, where embeddings converge into…

Machine Learning · Computer Science 2025-12-10 Huanran Li , Manh Nguyen , Daniel Pimentel-Alarcón

One of the frontier issues that severely hamper the development of automatic snore sound classification (ASSC) associates to the lack of sufficient supervised training data. To cope with this problem, we propose a novel data augmentation…

Machine Learning · Computer Science 2019-04-01 Zixing Zhang , Jing Han , Kun Qian , Christoph Janott , Yanan Guo , Bjoern Schuller

Purpose: Paranasal anomalies, frequently identified in routine radiological screenings, exhibit diverse morphological characteristics. Due to the diversity of anomalies, supervised learning methods require large labelled dataset exhibiting…

This paper presents simple and efficient methods to mitigate sampling bias in active learning while achieving state-of-the-art accuracy and model robustness. We introduce supervised contrastive active learning by leveraging the contrastive…

Machine Learning · Computer Science 2021-09-15 Ranganath Krishnan , Alok Sinha , Nilesh Ahuja , Mahesh Subedar , Omesh Tickoo , Ravi Iyer

Noise-inclusive fully unsupervised anomaly detection (FUAD) holds significant practical relevance. Although various methods exist to address this problem, they are limited in both performance and scalability. Our work seeks to overcome…

Image and Video Processing · Electrical Eng. & Systems 2025-06-19 Chengming Liu , Fengjie Wang , Lei Shi , Zhe Zhao

Self-supervised learning approach like contrastive learning is attached great attention in natural language processing. It uses pairs of training data augmentations to build a classification task for an encoder with well representation…

Computation and Language · Computer Science 2021-12-03 Deshui Miao , Jiaqi Zhang , Wenbo Xie , Jian Song , Xin Li , Lijuan Jia , Ning Guo

Face forgery detection is raising ever-increasing interest in computer vision since facial manipulation technologies cause serious worries. Though recent works have reached sound achievements, there are still unignorable problems: a)…

Computer Vision and Pattern Recognition · Computer Science 2021-03-17 Jiaming Li , Hongtao Xie , Jiahong Li , Zhongyuan Wang , Yongdong Zhang

Self-supervised learning (SSL) approaches, such as contrastive and generative methods, have advanced environmental sound representation learning using unlabeled data. However, how these approaches can complement each other within a unified…

Sound · Computer Science 2025-10-29 Sivan Ding , Julia Wilkins , Magdalena Fuentes , Juan Pablo Bello

Semi-supervised learning aims to leverage a large amount of unlabeled data for performance boosting. Existing works primarily focus on image classification. In this paper, we delve into semi-supervised learning for object detection, where…

Computer Vision and Pattern Recognition · Computer Science 2021-11-02 Zhenyu Wang , Yali Li , Ye Guo , Shengjin Wang

Acoustic scene classification (ASC) aims to identify the type of scene (environment) in which a given audio signal is recorded. The log-mel feature and convolutional neural network (CNN) have recently become the most popular time-frequency…

Sound · Computer Science 2021-08-12 Yuzhong Wu , Tan Lee

Most of existing audio fingerprinting systems have limitations to be used for high-specific audio retrieval at scale. In this work, we generate a low-dimensional representation from a short unit segment of audio, and couple this fingerprint…

Sound · Computer Science 2021-02-11 Sungkyun Chang , Donmoon Lee , Jeongsoo Park , Hyungui Lim , Kyogu Lee , Karam Ko , Yoonchang Han

To develop a machine sound monitoring system, a method for detecting anomalous sound is proposed. In this paper, we explore a method for multiple clients to collaboratively learn an anomalous sound detection model while keeping their raw…

Audio and Speech Processing · Electrical Eng. & Systems 2024-03-26 Kota Dohi , Yohei Kawaguchi

Recent Audio Large Language Models (AudioLLMs) exhibit a striking performance inversion: while excelling at complex reasoning tasks, they consistently underperform on fine-grained acoustic perception. We attribute this gap to a fundamental…

Computation and Language · Computer Science 2026-04-15 Linhao Zhang , Yuhan Song , Aiwei Liu , Chuhan Wu , Sijun Zhang , Wei Jia , Yuan Liu , Houfeng Wang , Xiao Zhou

Due to the advantages of leveraging unlabeled data and learning meaningful representations, semi-supervised learning and contrastive learning have been progressively combined to achieve better performances in popular applications with few…

Computer Vision and Pattern Recognition · Computer Science 2023-12-27 Bowen Tao , Lan Li , Xin-Chun Li , De-Chuan Zhan

To improve the detection accuracy and generalization of steganalysis, this paper proposes the Steganalysis Contrastive Framework (SCF) based on contrastive learning. The SCF improves the feature representation of steganalysis by maximizing…

Artificial Intelligence · Computer Science 2021-03-02 Yanzhen Ren , Yiwen Liu , Lina Wang

The performance of machine learning algorithms is known to be negatively affected by possible mismatches between training (source) and test (target) data distributions. In fact, this problem emerges whenever an acoustic scene classification…

Audio and Speech Processing · Electrical Eng. & Systems 2020-05-04 Alessandro Ilic Mezza , Emanuël A. P. Habets , Meinard Müller , Augusto Sarti

Sign language recognition (SLR) is a machine learning task aiming to identify signs in videos. Due to the scarcity of annotated data, unsupervised methods like contrastive learning have become promising in this field. They learn meaningful…

Computer Vision and Pattern Recognition · Computer Science 2026-03-09 Ariel Basso Madjoukeng , Jérôme Fink , Pierre Poitier , Edith Belise Kenmogne , Benoit Frenay

Anomalous sound detection (ASD) is, nowadays, one of the topical subjects in machine listening discipline. Unsupervised detection is attracting a lot of interest due to its immediate applicability in many fields. For example, related to…

Audio and Speech Processing · Electrical Eng. & Systems 2020-06-30 Sergi Perez-Castanos , Javier Naranjo-Alcazar , Pedro Zuccarello , Maximo Cobos

Thanks to the development of deep learning, research on machine anomalous sound detection based on self-supervised learning has made remarkable achievements. However, there are differences in the acoustic characteristics of the test set and…

Sound · Computer Science 2022-09-08 Jing-ke Yan , Xin Wang , Qin Wang , Qin Qin , Huang-he Li , Peng-fei Ye , Yue-ping He , Jing Zeng