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Semi-supervised learning (SSL) has shown great promise in leveraging unlabeled data to improve model performance. While standard SSL assumes uniform data distribution, we consider a more realistic and challenging setting called imbalanced…

Computer Vision and Pattern Recognition · Computer Science 2024-01-19 Hao Chen , Yue Fan , Yidong Wang , Jindong Wang , Bernt Schiele , Xing Xie , Marios Savvides , Bhiksha Raj

Existing semi-supervised learning (SSL) algorithms typically assume class-balanced datasets, although the class distributions of many real-world datasets are imbalanced. In general, classifiers trained on a class-imbalanced dataset are…

Machine Learning · Computer Science 2021-10-22 Hyuck Lee , Seungjae Shin , Heeyoung Kim

Semi-Supervised Learning (SSL) has achieved great success in overcoming the difficulties of labeling and making full use of unlabeled data. However, SSL has a limited assumption that the numbers of samples in different classes are balanced,…

Machine Learning · Computer Science 2020-02-18 Minsung Hyun , Jisoo Jeong , Nojun Kwak

Semi-supervised learning (SSL) algorithms struggle to perform well when exposed to imbalanced training data. In this scenario, the generated pseudo-labels can exhibit a bias towards the majority class, and models that employ these…

Machine Learning · Computer Science 2024-09-18 Zeju Li , Ying-Qiu Zheng , Chen Chen , Saad Jbabdi

Semi-Supervised Learning (SSL) can leverage abundant unlabeled data to boost model performance. However, the class-imbalanced data distribution in real-world scenarios poses great challenges to SSL, resulting in performance degradation.…

Computer Vision and Pattern Recognition · Computer Science 2025-01-13 Yin Wang , Zixuan Wang , Hao Lu , Zhen Qin , Hailiang Zhao , Guanjie Cheng , Ge Su , Li Kuang , Mengchu Zhou , Shuiguang Deng

Semi-Supervised Learning (SSL) has shown its strong ability in utilizing unlabeled data when labeled data is scarce. However, most SSL algorithms work under the assumption that the class distributions are balanced in both training and test…

Computer Vision and Pattern Recognition · Computer Science 2021-12-14 Ju He , Adam Kortylewski , Shaokang Yang , Shuai Liu , Cheng Yang , Changhu Wang , Alan Yuille

Pseudo-labeling has proven to be a promising semi-supervised learning (SSL) paradigm. Existing pseudo-labeling methods commonly assume that the class distributions of training data are balanced. However, such an assumption is far from…

Machine Learning · Computer Science 2023-03-03 Renzhen Wang , Xixi Jia , Quanziang Wang , Yichen Wu , Deyu Meng

Active Learning (AL) and Semi-supervised Learning are two techniques that have been studied to reduce the high cost of deep learning by using a small amount of labeled data and a large amount of unlabeled data. To improve the accuracy of…

Computer Vision and Pattern Recognition · Computer Science 2023-03-17 Jaeseung Lim , Jongkeun Na , Nojun Kwak

The capability of the traditional semi-supervised learning (SSL) methods is far from real-world application due to severely biased pseudo-labels caused by (1) class imbalance and (2) class distribution mismatch between labeled and unlabeled…

Computer Vision and Pattern Recognition · Computer Science 2022-06-03 Youngtaek Oh , Dong-Jin Kim , In So Kweon

Semi-supervised Learning (SSL) reduces the need for extensive annotations in deep learning, but the more realistic challenge of imbalanced data distribution in SSL remains largely unexplored. In Class Imbalanced Semi-supervised Learning…

Computer Vision and Pattern Recognition · Computer Science 2024-07-15 Qianhan Feng , Lujing Xie , Shijie Fang , Tong Lin

Semi-supervised learning (SSL) has made significant strides in the field of remote sensing. Finding a large number of labeled datasets for SSL methods is uncommon, and manually labeling datasets is expensive and time-consuming. Furthermore,…

Computer Vision and Pattern Recognition · Computer Science 2022-12-22 Fahmida Tasnim Lisa , Md. Zarif Hossain , Sharmin Naj Mou , Shahriar Ivan , Md. Hasanul Kabir

Pseudo-label-based semi-supervised learning (SSL) algorithms trained on a class-imbalanced set face two cascading challenges: 1) Classifiers tend to be biased towards majority classes, and 2) Biased pseudo-labels are used for training. It…

Computer Vision and Pattern Recognition · Computer Science 2024-05-28 Hyuck Lee , Heeyoung Kim

Semi-supervised learning (SSL) commonly exhibits confirmation bias, where models disproportionately favor certain classes, leading to errors in predicted pseudo labels that accumulate under a self-training paradigm. Unlike supervised…

Machine Learning · Computer Science 2024-09-30 Yu Wang , Yuxuan Yin , Peng Li

Exploring a substantial amount of unlabeled data, semi-supervised learning (SSL) boosts the recognition performance when only a limited number of labels are provided. However, traditional methods assume that the data distribution is…

Computer Vision and Pattern Recognition · Computer Science 2023-05-23 Wujian Peng , Zejia Weng , Hengduo Li , Zuxuan Wu

Semi-supervised learning (SSL) provides an effective means of leveraging unlabelled data to improve a model performance. Even though the domain has received a considerable amount of attention in the past years, most methods present the…

Machine Learning · Statistics 2023-03-06 Hugo Schmutz , Olivier Humbert , Pierre-Alexandre Mattei

Semi-supervised learning (SSL) has shown notable potential in relieving the heavy demand of dense prediction tasks on large-scale well-annotated datasets, especially for the challenging multi-organ segmentation (MoS). However, the…

Computer Vision and Pattern Recognition · Computer Science 2025-01-08 Zhenghao Feng , Lu Wen , Yuanyuan Xu , Binyu Yan , Xi Wu , Jiliu Zhou , Yan Wang

Self-supervised learning (SSL) is a scalable way to learn general visual representations since it learns without labels. However, large-scale unlabeled datasets in the wild often have long-tailed label distributions, where we know little…

Machine Learning · Computer Science 2022-05-24 Hong Liu , Jeff Z. HaoChen , Adrien Gaidon , Tengyu Ma

While annotating decent amounts of data to satisfy sophisticated learning models can be cost-prohibitive for many real-world applications. Active learning (AL) and semi-supervised learning (SSL) are two effective, but often isolated, means…

Machine Learning · Computer Science 2022-06-08 Jiannan Guo , Yangyang Kang , Yu Duan , Xiaozhong Liu , Siliang Tang , Wenqiao Zhang , Kun Kuang , Changlong Sun , Fei Wu

Medical image classification is a challenging task due to the scarcity of labeled samples and class imbalance caused by the high variance in disease prevalence. Semi-supervised learning (SSL) methods can mitigate these challenges by…

Computer Vision and Pattern Recognition · Computer Science 2023-07-11 Md Junaid Mahmood , Pranaw Raj , Divyansh Agarwal , Suruchi Kumari , Pravendra Singh

Do we need active learning? The rise of strong deep semi-supervised methods raises doubt about the usability of active learning in limited labeled data settings. This is caused by results showing that combining semi-supervised learning…

Machine Learning · Computer Science 2023-08-17 Sandra Gilhuber , Rasmus Hvingelby , Mang Ling Ada Fok , Thomas Seidl
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