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Learning from imbalanced data is a challenging task. Standard classification algorithms tend to perform poorly when trained on imbalanced data. Some special strategies need to be adopted, either by modifying the data distribution or by…

Machine Learning · Computer Science 2022-08-26 Asif Newaz , Shahriar Hassan , Farhan Shahriyar Haq

Facial expressions are crucial to human communication, offering insights into emotional states. This study examines how specific facial features influence emotion classification, using facial perturbations on the Fer2013 dataset. As…

Computer Vision and Pattern Recognition · Computer Science 2024-11-05 Cheng Qiu

Neural networks trained on real-world datasets with long-tailed label distributions are biased towards frequent classes and perform poorly on infrequent classes. The imbalance in the ratio of positive and negative samples for each class…

Computer Vision and Pattern Recognition · Computer Science 2021-05-25 Kevin Duarte , Yogesh S. Rawat , Mubarak Shah

The study of healthy brain development helps to better understand the brain transformation and brain connectivity patterns which happen during childhood to adulthood. This study presents a sparse machine learning solution across whole-brain…

Machine Learning · Computer Science 2019-04-03 Peyman Hosseinzadeh Kassani , Alexej Gossmann , Yu-Ping Wang

Data imbalance between common and rare diseases during model training often causes intelligent diagnosis systems to have biased predictions towards common diseases. The state-of-the-art approaches apply a two-stage learning framework to…

Computer Vision and Pattern Recognition · Computer Science 2022-07-15 Chenghua Zeng , Huijuan Lu , Kanghao Chen , Ruixuan Wang , Wei-Shi Zheng

As the deployment of automated face recognition (FR) systems proliferates, bias in these systems is not just an academic question, but a matter of public concern. Media portrayals often center imbalance as the main source of bias, i.e.,…

Computer Vision and Pattern Recognition · Computer Science 2022-03-17 Valeriia Cherepanova , Steven Reich , Samuel Dooley , Hossein Souri , Micah Goldblum , Tom Goldstein

In this paper, we describe our method for the ISIC 2019 Skin Lesion Classification Challenge. The challenge comes with two tasks. For task 1, skin lesions have to be classified based on dermoscopic images. For task 2, dermoscopic images and…

Computer Vision and Pattern Recognition · Computer Science 2019-10-10 Nils Gessert , Maximilian Nielsen , Mohsin Shaikh , René Werner , Alexander Schlaefer

In this paper, we present an empirical study on image recognition fairness, i.e., extreme class accuracy disparity on balanced data like ImageNet. We experimentally demonstrate that classes are not equal and the fairness issue is prevalent…

Machine Learning · Computer Science 2024-03-14 Jiequan Cui , Beier Zhu , Xin Wen , Xiaojuan Qi , Bei Yu , Hanwang Zhang

Emotion detection from faces is one of the machine learning problems needed for human-computer interaction. The variety of methods used is enormous, which motivated an in-depth review of articles and scientific studies. Three of the most…

Computer Vision and Pattern Recognition · Computer Science 2026-01-21 Aleksandra Jamróz , Patrycja Wysocka , Piotr Garbat

For the last two decades, oversampling has been employed to overcome the challenge of learning from imbalanced datasets. Many approaches to solving this challenge have been offered in the literature. Oversampling, on the other hand, is a…

Machine Learning · Computer Science 2022-06-09 Ahmad B. Hassanat , Ahmad S. Tarawneh , Ghada A. Altarawneh , Abdullah Almuhaimeed

Automatic skin lesion classification from dermoscopy images is important for the early diagnosis of skin diseases such as melanoma. Class imbalance in skin lesion datasets, notably the defects in the representation of malignant(cancerous)…

Quantitative Methods · Quantitative Biology 2025-12-19 Ariful Islam Khandaker , Abdullah Al Shafi , Mohiuddin Ahmad

Class-imbalance refers to classification problems in which many more instances are available for certain classes than for others. Such imbalanced datasets require special attention because traditional classifiers generally favor the…

Machine Learning · Statistics 2018-11-30 Rafael M. O. Cruz , Robert Sabourin , George D. C. Cavalcanti

The proposed framework in this paper has the primary objective of classifying the facial expression shown by a person. These classifiable expressions can be any one of the six universal emotions along with the neutral emotion. After the…

Computer Vision and Pattern Recognition · Computer Science 2020-07-17 Fuzail Khan

Emotion plays a fundamental role in human interaction, and therefore systems capable of identifying emotions in speech are crucial in the context of human-computer interaction. Speech emotion recognition (SER) is a challenging problem,…

Audio and Speech Processing · Electrical Eng. & Systems 2025-06-03 Lucas Ueda , João Lima , Leonardo Marques , Paula Costa

This study addresses the racial biases in facial expression recognition (FER) systems within Large Multimodal Foundation Models (LMFMs). Despite advances in deep learning and the availability of diverse datasets, FER systems often exhibit…

Computer Vision and Pattern Recognition · Computer Science 2024-08-28 Kaylee Chhua , Zhoujinyi Wen , Vedant Hathalia , Kevin Zhu , Sean O'Brien

In imbalanced multi-class classification problems, the misclassification rate as an error measure may not be a relevant choice. Several methods have been developed where the performance measure retained richer information than the mere…

Machine Learning · Computer Science 2013-11-05 Sokol Koço , Cécile Capponi

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

As part of autonomous car driving systems, semantic segmentation is an essential component to obtain a full understanding of the car's environment. One difficulty, that occurs while training neural networks for this purpose, is class…

Computer Vision and Pattern Recognition · Computer Science 2019-01-25 Robin Chan , Matthias Rottmann , Fabian Hüger , Peter Schlicht , Hanno Gottschalk

Facial emotional recognition is one of the essential tools used by recognition psychology to diagnose patients. Face and facial emotional recognition are areas where machine learning is excelling. Facial Emotion Recognition in an…

Computer Vision and Pattern Recognition · Computer Science 2022-08-08 Nitesh Banskota , Abeer Alsadoon , P. W. C. Prasad , Ahmed Dawoud , Tarik A. Rashid , Omar Hisham Alsadoon

Emotion labels in emotion recognition corpora are highly noisy and ambiguous, due to the annotators' subjective perception of emotions. Such ambiguity may introduce errors in automatic classification and affect the overall performance. We…

Audio and Speech Processing · Electrical Eng. & Systems 2019-11-11 Takuya Fujioka , Dario Bertero , Takeshi Homma , Kenji Nagamatsu