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The class imbalance problem refers to the disproportionate distribution of samples across different classes within a dataset, where the minority classes are significantly underrepresented. This issue is also prevalent in graph-structured…

Machine Learning · Computer Science 2025-09-30 Fanlong Zeng , Wensheng Gan , Philip S. Yu

Many real-world applications reveal difficulties in learning classifiers from imbalanced data. The rising big data era has been witnessing more classification tasks with large-scale but extremely imbalance and low-quality datasets. Most of…

Machine Learning · Computer Science 2020-10-20 Zhining Liu , Wei Cao , Zhifeng Gao , Jiang Bian , Hechang Chen , Yi Chang , Tie-Yan Liu

A data augmentation module is utilized in contrastive learning to transform the given data example into two views, which is considered essential and irreplaceable. However, the predetermined composition of multiple data augmentations brings…

Computer Vision and Pattern Recognition · Computer Science 2022-08-23 Junbo Zhang , Kaisheng Ma

Real world datasets are heavily skewed where some classes are significantly outnumbered by the other classes. In these situations, machine learning algorithms fail to achieve substantial efficacy while predicting these under-represented…

Machine Learning · Computer Science 2021-03-16 Mimi Mukherjee , Matloob Khushi

Abstractive summarization systems based on pretrained language models often generate coherent but factually inconsistent sentences. In this paper, we present a counterfactual data augmentation approach where we augment data with perturbed…

Computation and Language · Computer Science 2022-05-26 Dheeraj Rajagopal , Siamak Shakeri , Cicero Nogueira dos Santos , Eduard Hovy , Chung-Ching Chang

Classification of imbalanced datasets is a challenging task for standard algorithms. Although many methods exist to address this problem in different ways, generating artificial data for the minority class is a more general approach…

Machine Learning · Computer Science 2017-09-22 Georgios Douzas , Fernando Bacao

Classification of imbalanced data is one of the common problems in the recent field of data mining. Imbalanced data substantially affects the performance of standard classification models. Data-level approaches mainly use the oversampling…

Machine Learning · Computer Science 2021-05-11 Seung Jee Yang , Kyung Joon Cha

While state-of-the-art NLP models have been achieving the excellent performance of a wide range of tasks in recent years, important questions are being raised about their robustness and their underlying sensitivity to systematic biases that…

Computation and Language · Computer Science 2022-03-25 Linyi Yang , Jiazheng Li , Pádraig Cunningham , Yue Zhang , Barry Smyth , Ruihai Dong

In current visual model training, models often rely on only limited sufficient causes for their predictions, which makes them sensitive to distribution shifts or the absence of key features. Attribution methods can accurately identify a…

Computer Vision and Pattern Recognition · Computer Science 2025-11-18 Yannan Chen , Ruoyu Chen , Bin Zeng , Wei Wang , Shiming Liu , Qunli Zhang , Zheng Hu , Laiyuan Wang , Yaowei Wang , Xiaochun Cao

Introduction Data imbalance is one of the crucial issues in big data analysis with fewer labels. For example, in real-world healthcare data, spam detection labels, and financial fraud detection datasets. Many data balance methods were…

Machine Learning · Computer Science 2023-01-27 Chenyu Li , Xia Jiang

Class imbalance can often degrade predictive performance of supervised learning algorithms. Balanced classes can be obtained by oversampling exact copies, with noise, or interpolation between nearest neighbours (as in traditional SMOTE…

Machine Learning · Computer Science 2022-01-17 Emily Muller , Xu Zheng , Jer Hayes

In many real-world pattern recognition scenarios, such as in medical applications, the corresponding classification tasks can be of an imbalanced nature. In the current study, we focus on binary, imbalanced classification tasks, i.e.~binary…

Machine Learning · Computer Science 2020-12-01 Peter Bellmann , Heinke Hihn , Daniel A. Braun , Friedhelm Schwenker

Counterfactual explanations (CFEs) provide human-centric interpretability by identifying the minimal, actionable changes required to alter a machine learning model's prediction. Therefore, CFs can be used as (i) interventions for…

Machine Learning · Computer Science 2026-04-21 Shovito Barua Soumma , Asiful Arefeen , Stephanie M. Carpenter , Melanie Hingle , Hassan Ghasemzadeh

Class-incremental fault diagnosis requires a model to adapt to new fault classes while retaining previous knowledge. However, limited research exists for imbalanced and long-tailed data. Extracting discriminative features from few-shot…

Machine Learning · Computer Science 2025-01-22 Hanrong Zhang , Yifei Yao , Zixuan Wang , Jiayuan Su , Mengxuan Li , Peng Peng , Hongwei Wang

Incremental Learning (IL) allows AI systems to adapt to streamed data. Most existing algorithms make two strong hypotheses which reduce the realism of the incremental scenario: (1) new data are assumed to be readily annotated when streamed…

Computer Vision and Pattern Recognition · Computer Science 2020-08-26 Eden Belouadah , Adrian Popescu , Umang Aggarwal , Léo Saci

Automated scoring of students' scientific explanations offers the potential for immediate, accurate feedback, yet class imbalance in rubric categories particularly those capturing advanced reasoning remains a challenge. This study…

Artificial Intelligence · Computer Science 2026-04-23 Prudence Djagba , Kevin Haudek , Clare G. C. Franovic , Leonora Kaldaras

Counterfactual data augmentation (CDA) is a method for controlling information or biases in training datasets by generating a complementary dataset with typically opposing biases. Prior work often either relies on hand-crafted rules or…

Machine Learning · Computer Science 2025-02-26 Mitchell Plyler , Min Chi

Learning classifiers using skewed or imbalanced datasets can occasionally lead to classification issues; this is a serious issue. In some cases, one class contains the majority of examples while the other, which is frequently the more…

Machine Learning · Computer Science 2022-11-11 Satyendra Singh Rawat , Amit Kumar Mishra

A natural way of handling imbalanced data is to attempt to equalise the class frequencies and train the classifier of choice on balanced data. For two-class imbalanced problems, the classification success is typically measured by the…

Computer Vision and Pattern Recognition · Computer Science 2018-04-20 Ludmila I. Kuncheva , Álvar Arnaiz-González , José-Francisco Díez-Pastor , Iain A. D. Gunn

In real-world machine learning systems, labels are often derived from user behaviors that the system wishes to encourage. Over time, new models must be trained as new training examples and features become available. However, feedback loops…

Machine Learning · Computer Science 2023-11-01 Victoria Lin , Louis-Philippe Morency , Dimitrios Dimitriadis , Srinagesh Sharma