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Long-tail learning has received significant attention in recent years due to the challenge it poses with extremely imbalanced datasets. In these datasets, only a few classes (known as the head classes) have an adequate number of training…

Computer Vision and Pattern Recognition · Computer Science 2023-10-30 Jiang-Xin Shi , Tong Wei , Yuke Xiang , Yu-Feng Li

Practical natural language processing (NLP) tasks are commonly long-tailed with noisy labels. Those problems challenge the generalization and robustness of complex models such as Deep Neural Networks (DNNs). Some commonly used resampling…

Computation and Language · Computer Science 2023-05-04 Sunyi Chi , Bo Dong , Yiming Xu , Zhenyu Shi , Zheng Du

Modern deep neural networks can easily overfit to biased training data containing corrupted labels or class imbalance. Sample re-weighting methods are popularly used to alleviate this data bias issue. Most current methods, however, require…

Machine Learning · Computer Science 2023-05-02 Jun Shu , Xiang Yuan , Deyu Meng , Zongben Xu

Long-tailed data bias decision boundaries toward head classes and degrade tail class accuracy. Diffusion-based generative augmentation address this problem by generating additional data, while head-to-tail transfer further mitigate the…

Computer Vision and Pattern Recognition · Computer Science 2026-05-05 Jiacheng Yang , Ruichi Zhang , Chikai Shang , Mengke Li , Xinyi Shang , Junlong Gao , Yonggang Zhang , Yang Lu

In the real world, data tends to follow long-tailed distributions w.r.t. class or attribution, motivating the challenging Long-Tailed Recognition (LTR) problem. In this paper, we revisit recent LTR methods with promising Vision Transformers…

Computer Vision and Pattern Recognition · Computer Science 2023-04-18 Zhengzhuo Xu , Shuo Yang , Xingjun Wang , Chun Yuan

The variance in class-wise sample sizes within long-tailed scenarios often results in degraded performance in less frequent classes. Fortunately, foundation models, pre-trained on vast open-world datasets, demonstrate strong potential for…

Computer Vision and Pattern Recognition · Computer Science 2025-07-18 Yufei Peng , Yonggang Zhang , Yiu-ming Cheung

Semantic segmentation usually suffers from a long-tail data distribution. Due to the imbalanced number of samples across categories, the features of those tail classes may get squeezed into a narrow area in the feature space. Towards a…

Computer Vision and Pattern Recognition · Computer Science 2023-06-06 Yuchao Wang , Jingjing Fei , Haochen Wang , Wei Li , Tianpeng Bao , Liwei Wu , Rui Zhao , Yujun Shen

Class imbalance is a common challenge in many NLP tasks, and has clear connections to bias, in that bias in training data often leads to higher accuracy for majority groups at the expense of minority groups. However there has traditionally…

Computation and Language · Computer Science 2021-09-23 Shivashankar Subramanian , Afshin Rahimi , Timothy Baldwin , Trevor Cohn , Lea Frermann

Conformal prediction has emerged as a rigorous means of providing deep learning models with reliable uncertainty estimates and safety guarantees. Yet, its performance is known to degrade under distribution shift and long-tailed class…

Machine Learning · Computer Science 2023-07-06 Kevin Kasa , Graham W. Taylor

In class incremental learning (CIL) a model must learn new classes in a sequential manner without forgetting old ones. However, conventional CIL methods consider a balanced distribution for each new task, which ignores the prevalence of…

Computer Vision and Pattern Recognition · Computer Science 2022-10-04 Xialei Liu , Yu-Song Hu , Xu-Sheng Cao , Andrew D. Bagdanov , Ke Li , Ming-Ming Cheng

Imbalanced datasets are commonplace in modern machine learning problems. The presence of under-represented classes or groups with sensitive attributes results in concerns about generalization and fairness. Such concerns are further…

Machine Learning · Computer Science 2022-01-05 Mingchen Li , Xuechen Zhang , Christos Thrampoulidis , Jiasi Chen , Samet Oymak

Class imbalance poses a significant challenge in classification tasks, where traditional approaches often lead to biased models and unreliable predictions. Undersampling and oversampling techniques have been commonly employed to address…

Machine Learning · Computer Science 2025-10-22 Matt Clifford , Jonathan Erskine , Alexander Hepburn , Raúl Santos-Rodríguez , Dario Garcia-Garcia

Class imbalance poses a challenge for developing unbiased, accurate predictive models. In particular, in image segmentation neural networks may overfit to the foreground samples from small structures, which are often heavily…

Computer Vision and Pattern Recognition · Computer Science 2021-02-23 Zeju Li , Konstantinos Kamnitsas , Ben Glocker

Conventional knowledge distillation, designed for model compression, fails on long-tailed distributions because the teacher model tends to be biased toward head classes and provides limited supervision for tail classes. We propose…

Computer Vision and Pattern Recognition · Computer Science 2026-03-02 Seonghak Kim

Class imbalance induces systematic bias in deep neural networks by imposing a skewed effective class prior. This work introduces the Neural Prior Estimator (NPE), a framework that learns feature-conditioned log-prior estimates from latent…

Machine Learning · Computer Science 2026-02-23 Masoud Yavari , Payman Moallem

Learning from imbalanced data is one of the most significant challenges in real-world classification tasks. In such cases, neural networks performance is substantially impaired due to preference towards the majority class. Existing…

Machine Learning · Computer Science 2022-11-13 Bronislav Yasinnik , Moshe Salhov , Ofir Lindenbaum , Amir Averbuch

Integrating supervised contrastive loss to cross entropy-based communication has recently been proposed as a solution to address the long-tail learning problem. However, when the class imbalance ratio is high, it requires adjusting the…

Machine Learning · Computer Science 2024-07-10 Charika De Alvis , Dishanika Denipitiyage , Suranga Seneviratne

Most existing methods that cope with noisy labels usually assume that the class distributions are well balanced, which has insufficient capacity to deal with the practical scenarios where training samples have imbalanced distributions. To…

Computer Vision and Pattern Recognition · Computer Science 2022-09-27 Chaowei Fang , Lechao Cheng , Huiyan Qi , Dingwen Zhang

Class imbalance has been extensively studied in single-view scenarios; however, addressing this challenge in multi-view contexts remains an open problem, with even scarcer research focusing on trustworthy solutions. In this paper, we tackle…

Machine Learning · Computer Science 2025-11-13 Chuanqing Tang , Yifei Shi , Guanghao Lin , Lei Xing , Long Shi

Real-world data usually suffers from severe class imbalance and long-tailed distributions, where minority classes are significantly underrepresented compared to the majority ones. Recent research prefers to utilize multi-expert…

Computer Vision and Pattern Recognition · Computer Science 2023-05-08 Zhengzhuo Xu , Zenghao Chai , Chengyin Xu , Chun Yuan , Haiqin Yang
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