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In predictive tasks, real-world datasets often present different degrees of imbalanced (i.e., long-tailed or skewed) distributions. While the majority (the head) classes have sufficient samples, the minority (the tail) classes can be…

Machine Learning · Computer Science 2021-09-14 Chongsheng Zhang , Paolo Soda , Jingjun Bi , Gaojuan Fan , George Almpanidis , Salvador Garcia

Long-tailed recognition is ubiquitous and challenging in deep learning and even in the downstream finetuning of foundation models, since the skew class distribution generally prevents the model generalization to the tail classes. Despite…

Machine Learning · Computer Science 2025-10-10 Jiaan Luo , Feng Hong , Qiang Hu , Xiaofeng Cao , Feng Liu , Jiangchao Yao

Solving long-tail large vocabulary object detection with deep learning based models is a challenging and demanding task, which is however under-explored.In this work, we provide the first systematic analysis on the underperformance of…

Computer Vision and Pattern Recognition · Computer Science 2020-06-20 Yu Li , Tao Wang , Bingyi Kang , Sheng Tang , Chunfeng Wang , Jintao Li , Jiashi Feng

Real-world data often follow a long-tailed distribution with a high imbalance in the number of samples between classes. The problem with training from imbalanced data is that some background features, common to all classes, can be…

Computer Vision and Pattern Recognition · Computer Science 2024-06-05 Sanglee Park , Seung-won Hwang , Jungmin So

Sharpness-aware minimization (SAM) has emerged as a highly effective technique to improve model generalization, but its underlying principles are not fully understood. We investigate m-sharpness, where SAM performance improves monotonically…

Machine Learning · Computer Science 2026-04-03 Haocheng Luo , Mehrtash Harandi , Dinh Phung , Trung Le

Sharpness-Aware Minimization (SAM) is a recent optimization framework aiming to improve the deep neural network generalization, through obtaining flatter (i.e. less sharp) solutions. As SAM has been numerically successful, recent papers…

Machine Learning · Statistics 2023-05-22 Kayhan Behdin , Rahul Mazumder

Active learning aims to reduce the labeling effort that is required to train algorithms by learning an acquisition function selecting the most relevant data for which a label should be requested from a large unlabeled data pool. Active…

Computer Vision and Pattern Recognition · Computer Science 2021-10-12 Javad Zolfaghari Bengar , Joost van de Weijer , Laura Lopez Fuentes , Bogdan Raducanu

The generalization performance of deep neural networks (DNNs) is a critical factor in achieving robust model behavior on unseen data. Recent studies have highlighted the importance of sharpness-based measures in promoting generalization by…

Machine Learning · Computer Science 2025-01-28 Mohamed Hassan , Aleksandar Vakanski , Boyu Zhang , Min Xian

In the real world, long-tailed data distributions are prevalent, making it challenging for models to effectively learn and classify tail classes. However, we discover that in the field of drug chemistry, certain tail classes exhibit higher…

Machine Learning · Computer Science 2025-04-08 Yujia Su , Xinjie Li , Lionel Z. Wang

Real-world imagery is often characterized by a significant imbalance of the number of images per class, leading to long-tailed distributions. An effective and simple approach to long-tailed visual recognition is to learn feature…

Computer Vision and Pattern Recognition · Computer Science 2022-01-14 Ahmet Iscen , André Araujo , Boqing Gong , Cordelia Schmid

Real-world visual data often exhibits a long-tailed distribution, where some ''head'' classes have a large number of samples, yet only a few samples are available for ''tail'' classes. Such imbalanced distribution causes a great challenge…

Computer Vision and Pattern Recognition · Computer Science 2020-03-11 Junjie Zhang , Lingqiao Liu , Peng Wang , Chunhua Shen

Balancing training on long-tail data distributions remains a long-standing challenge in deep learning. While methods such as re-weighting and re-sampling help alleviate the imbalance issue, limited sample diversity continues to hinder…

Computer Vision and Pattern Recognition · Computer Science 2024-12-10 Shizhen Zhao , Xin Wen , Jiahui Liu , Chuofan Ma , Chunfeng Yuan , Xiaojuan Qi

Fine-tuning large pretrained language models on a limited training corpus usually suffers from poor generalization. Prior works show that the recently-proposed sharpness-aware minimization (SAM) optimization method can improve the model…

Computation and Language · Computer Science 2022-10-12 Qihuang Zhong , Liang Ding , Li Shen , Peng Mi , Juhua Liu , Bo Du , Dacheng Tao

Long-tailed instance segmentation is a challenging task due to the extreme imbalance of training samples among classes. It causes severe biases of the head classes (with majority samples) against the tailed ones. This renders "how to…

Computer Vision and Pattern Recognition · Computer Science 2022-04-05 Yin-Yin He , Peizhen Zhang , Xiu-Shen Wei , Xiangyu Zhang , Jian Sun

The problem of class imbalance is extensive for focusing on numerous applications in the real world. In such a situation, nearly all of the examples are labeled as one class called majority class, while far fewer examples are labeled as the…

Sharpness-Aware Minimization (SAM) is an optimization method that improves generalization performance of machine learning models. Despite its superior generalization, SAM has not been actively used in real-world applications due to its…

Machine Learning · Computer Science 2025-03-17 Junhyuk Jo , Jihyun Lim , Sunwoo Lee

There are many real-world classification problems wherein the issue of data imbalance (the case when a data set contains substantially more samples for one/many classes than the rest) is unavoidable. While under-sampling the problematic…

Computer Vision and Pattern Recognition · Computer Science 2018-01-09 John McKay , Isaac Gerg , Vishal Monga

Large Language Model-based Recommender Systems (LRSs) have recently emerged as a new paradigm in sequential recommendation by directly adopting LLMs as backbones. While LRSs demonstrate strong knowledge utilization and instruction-following…

Information Retrieval · Computer Science 2026-03-16 Jiaming Zhang , Yuyuan Li , Xiaohua Feng , Li Zhang , Longfei Li , Jun Zhou , Chaochao Chen

Class imbalance, which is also called long-tailed distribution, is a common problem in classification tasks based on machine learning. If it happens, the minority data will be overwhelmed by the majority, which presents quite a challenge…

Machine Learning · Computer Science 2023-03-29 Jia-Chen Zhao

Class imbalance in binary classification tasks remains a significant challenge in machine learning, often resulting in poor performance on minority classes. This study comprehensively evaluates three widely-used strategies for handling…

Machine Learning · Computer Science 2024-10-01 Mohamed Abdelhamid , Abhyuday Desai