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arXiv 2407.05973cs.LGcs.CV
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面向高标签噪声下不平衡医学图像分类任务鲁棒训练的主动标签精炼

Active Label Refinement for Robust Training of Imbalanced Medical Image Classification Tasks in the Presence of High Label Noise

Center for Imaging Science, Rochester Institute of Technology(罗切斯特理工学院成像科学中心);University of Aberdeen(阿伯丁大学);Biomedical Engineering, Rochester Institute of Technology(罗切斯特理工学院生物医学工程系)

Bidur Khanal, Tianhong Dai, Binod Bhattarai, Cristian Linte

AI总结:

本文提出结合LNL与主动学习的两阶段标签精炼框架,引入梯度方差采样少数类,在有限预算下提升高噪声、类别不平衡医学图像分类的鲁棒性。

摘要:

基于监督深度学习的医学图像分类的鲁棒性会因标签噪声而显著下降。尽管已有若干方法被提出以在存在噪声标签时提升分类性能,但它们面临一些挑战:1)难以处理类别不平衡数据集,导致少数类样本经常被当作噪声样本而忽视;2)只关注利用噪声数据集最大化性能,而没有引入人在回路专家来主动清洗噪声标签。为缓解这些挑战,我们提出一种结合带噪标签学习(Learning with Noisy Labels,LNL)与主动学习的两阶段方法。该方法不仅提升了存在噪声标签时医学图像分类的鲁棒性,还在有限标注预算下,通过重新标注重要的错误标签来迭代提高数据集质量。此外,我们在LNL阶段引入了一种新颖的梯度方差方法,该方法通过同时对代表性不足的样本进行采样,补充了基于损失的样本选择。在两个不平衡的带噪医学分类数据集上,我们证明所提出技术在处理类别不平衡方面优于先前方法,不会将来自少数类的干净样本错误识别为主要是噪声的样本。

英文摘要:

The robustness of supervised deep learning-based medical image classification is significantly undermined by label noise. Although several methods have been proposed to enhance classification performance in the presence of noisy labels, they face some challenges: 1) a struggle with class-imbalanced datasets, leading to the frequent overlooking of minority classes as noisy samples; 2) a singular focus on maximizing performance using noisy datasets, without incorporating experts-in-the-loop for actively cleaning the noisy labels. To mitigate these challenges, we propose a two-phase approach that combines Learning with Noisy Labels (LNL) and active learning. This approach not only improves the robustness of medical image classification in the presence of noisy labels, but also iteratively improves the quality of the dataset by relabeling the important incorrect labels, under a limited annotation budget. Furthermore, we introduce a novel Variance of Gradients approach in LNL phase, which complements the loss-based sample selection by also sampling under-represented samples. Using two imbalanced noisy medical classification datasets, we demonstrate that that our proposed technique is superior to its predecessors at handling class imbalance by not misidentifying clean samples from minority classes as mostly noisy samples.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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