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Active learning (AL) is a machine learning algorithm that can achieve greater accuracy with fewer labeled training instances, for having the ability to ask oracles to label the most valuable unlabeled data chosen iteratively and…

Machine Learning · Computer Science 2022-09-30 Ruoyu Wang

Active learning (AL) aims to enable training high performance classifiers with low annotation cost by predicting which subset of unlabelled instances would be most beneficial to label. The importance of AL has motivated extensive research,…

Machine Learning · Computer Science 2018-06-14 Kunkun Pang , Mingzhi Dong , Yang Wu , Timothy Hospedales

Event extraction (EE) plays an important role in many industrial application scenarios, and high-quality EE methods require a large amount of manual annotation data to train supervised learning models. However, the cost of obtaining…

Computation and Language · Computer Science 2023-03-21 Shirong Shen , Zhen Li , Guilin Qi

Central to active learning (AL) is what data should be selected for annotation. Existing works attempt to select highly uncertain or informative data for annotation. Nevertheless, it remains unclear how selected data impacts the test…

Machine Learning · Computer Science 2022-01-25 Tianyang Wang , Xingjian Li , Pengkun Yang , Guosheng Hu , Xiangrui Zeng , Siyu Huang , Cheng-Zhong Xu , Min Xu

Convolutional Neural Networks (CNNs) have proven to be state-of-the-art models for supervised computer vision tasks, such as image classification. However, large labeled data sets are generally needed for the training and validation of such…

Machine Learning · Computer Science 2020-10-28 Patrick Hemmer , Niklas Kühl , Jakob Schöffer

Efficient data annotation remains a critical challenge in machine learning, particularly for object detection tasks requiring extensive labeled data. Active learning (AL) has emerged as a promising solution to minimize annotation costs by…

Computer Vision and Pattern Recognition · Computer Science 2025-09-25 Somraj Gautam , Nachiketa Purohit , Gaurav Harit

Active learning (AL) is a widely-used training strategy for maximizing predictive performance subject to a fixed annotation budget. In AL one iteratively selects training examples for annotation, often those for which the current model is…

Machine Learning · Computer Science 2019-11-05 David Lowell , Zachary C. Lipton , Byron C. Wallace

Active learning (AL) is an effective approach to select the most informative samples to label so as to reduce the annotation cost. Existing AL methods typically work under the closed-set assumption, i.e., all classes existing in the…

Computer Vision and Pattern Recognition · Computer Science 2023-07-12 Linhao Qu , Yingfan Ma , Zhiwei Yang , Manning Wang , Zhijian Song

This paper proposes asal, a new GAN based active learning method that generates high entropy samples. Instead of directly annotating the synthetic samples, ASAL searches similar samples from the pool and includes them for training. Hence,…

Machine Learning · Computer Science 2019-12-24 Christoph Mayer , Radu Timofte

The vast amounts of audio data collected in Sound Event Detection (SED) applications require efficient annotation strategies to enable supervised learning. Manual labeling is expensive and time-consuming, making Active Learning (AL) a…

Sound · Computer Science 2025-03-05 Richard Lindholm , Oscar Marklund , Olof Mogren , John Martinsson

Semantic segmentation requires pixel-level annotation, which is time-consuming. Active Learning (AL) is a promising method for reducing data annotation costs. Due to the gap between aerial and natural images, the previous AL methods are not…

Computer Vision and Pattern Recognition · Computer Science 2024-05-29 Lianlei Shan , Weiqiang Wang , Ke Lv , Bin Luo

Image segmentation is one of the most essential biomedical image processing problems for different imaging modalities, including microscopy and X-ray in the Internet-of-Medical-Things (IoMT) domain. However, annotating biomedical images is…

Computer Vision and Pattern Recognition · Computer Science 2021-01-25 Ziyuan Zhao , Zeng Zeng , Kaixin Xu , Cen Chen , Cuntai Guan

The expensive annotation cost is notoriously known as the main constraint for the development of the point cloud semantic segmentation technique. Active learning methods endeavor to reduce such cost by selecting and labeling only a subset…

Computer Vision and Pattern Recognition · Computer Science 2022-04-19 Feifei Shao , Yawei Luo , Ping Liu , Jie Chen , Yi Yang , Yulei Lu , Jun Xiao

Active Learning (AL) is increasingly important in a broad range of applications. Two main AL principles to obtain accurate classification with few labeled data are refinement of the current decision boundary and exploration of poorly…

Machine Learning · Computer Science 2012-10-19 Jens Roeder , Boaz Nadler , Kevin Kunzmann , Fred A. Hamprecht

While deep learning is a powerful tool for natural language processing (NLP) problems, successful solutions to these problems rely heavily on large amounts of annotated samples. However, manually annotating data is expensive and…

Machine Learning · Computer Science 2021-04-08 Rishi Hazra , Parag Dutta , Shubham Gupta , Mohammed Abdul Qaathir , Ambedkar Dukkipati

Deep learning has achieved widespread success in medical image analysis, leading to an increasing demand for large-scale expert-annotated medical image datasets. Yet, the high cost of annotating medical images severely hampers the…

Computer Vision and Pattern Recognition · Computer Science 2024-03-14 Haoran Wang , Qiuye Jin , Shiman Li , Siyu Liu , Manning Wang , Zhijian Song

Active learning (AL) seeks to reduce annotation costs by selecting the most informative samples for labeling, making it particularly valuable in resource-constrained settings. However, traditional evaluation methods, which focus solely on…

Machine Learning · Computer Science 2025-07-22 Julia Machnio , Mads Nielsen , Mostafa Mehdipour Ghazi

Automatic medical image segmentation plays a critical role in scientific research and medical care. Existing high-performance deep learning methods typically rely on large training datasets with high-quality manual annotations, which are…

Image and Video Processing · Electrical Eng. & Systems 2021-11-17 Shanshan Wang , Cheng Li , Rongpin Wang , Zaiyi Liu , Meiyun Wang , Hongna Tan , Yaping Wu , Xinfeng Liu , Hui Sun , Rui Yang , Xin Liu , Jie Chen , Huihui Zhou , Ismail Ben Ayed , Hairong Zheng

While deep learning is a powerful tool for natural language processing (NLP) problems, successful solutions to these problems rely heavily on large amounts of annotated samples. However, manually annotating data is expensive and…

Computation and Language · Computer Science 2021-04-06 Rishi Hazra , Parag Dutta , Shubham Gupta , Mohammed Abdul Qaathir , Ambedkar Dukkipati

Active Learning (AL) is a user-interactive approach aimed at reducing annotation costs by selecting the most crucial examples to label. Although AL has been extensively studied for image classification tasks, the specific scenario of…

Computer Vision and Pattern Recognition · Computer Science 2024-12-04 Leah Bar , Boaz Lerner , Nir Darshan , Rami Ben-Ari