Noisy labels hurt deep learning-based supervised image classification performance as the models may overfit the noise and learn corrupted feature extractors. For natural image classification training with noisy labeled data, model initialization with contrastive self-supervised pretrained weights has shown to reduce feature corruption and improve classification performance. However, no works have explored: i) how other self-supervised approaches, such as pretext task-based pretraining, impact the learning with noisy label, and ii) any self-supervised pretraining methods alone for medical images in noisy label settings. Medical images often feature smaller datasets and subtle inter class variations, requiring human expertise to ensure correct classification. Thus, it is not clear if the methods improving learning with noisy labels in natural image datasets such as CIFAR would also help with medical images. In this work, we explore contrastive and pretext task-based self-supervised pretraining to initialize the weights of a deep learning classification model for two medical datasets with self-induced noisy labels -- NCT-CRC-HE-100K tissue histological images and COVID-QU-Ex chest X-ray images. Our results show that models initialized with pretrained weights obtained from self-supervised learning can effectively learn better features and improve robustness against noisy labels.

噪声标签对基于深度学习的监督图像分类性能有负面影响，而自监督预训练权重的模型初始化可以减少特征损坏并提高分类性能，但尚未探索其他自监督方法对噪声标签的影响以及医学图像中仅使用自监督预训练方法对噪声标签的影响。本研究探索了对两个医学数据集进行对比和预备任务的自监督预训练，用于初始化深度学习分类模型的权重，结果显示使用自监督学习获得的预训练权重可以有效学习更好的特征，并提高对噪声标签的鲁棒性。

仅使用自监督预训练提高医学图像分类中的噪声标签问题