论文标题
一种半监督算法，用于改善众包数据集的一致性：COVID-19
A Semi-Supervised Algorithm for Improving the Consistency of Crowdsourced Datasets: The COVID-19 Case Study on Respiratory Disorder Classification
论文作者
论文摘要
咳嗽音频信号分类是筛选呼吸道疾病（例如COVID-19）的潜在有用工具。由于从这种传染性疾病的患者那里收集数据是危险的，因此许多研究团队已转向众包来快速收集咳嗽声数据，因为它是为了生成咳嗽数据集的工作。 Coughvid数据集邀请专家医生诊断有限数量上传记录中存在的潜在疾病。但是，这种方法遭受了咳嗽的潜在错误标签，并且专家之间的显着分歧。在这项工作中，我们使用半监督学习（SSL）方法来提高咳嗽数据集的标签一致性以及Covid-19的鲁棒性与健康的咳嗽声音分类。首先，我们利用现有的SSL专家知识聚合技术来克服数据集中的标签不一致和稀疏性。接下来，我们的SSL方法用于确定可用于训练或增加未来咳嗽分类模型的重新标记咳嗽音频样本的子样本。证明了重新标记的数据的一致性，因为它表现出高度的类可分离性，尽管原始数据集中存在专家标签不一致，但它比用户标记的数据高3倍。此外，在重新标记的数据中放大了用户标记的音频段的光谱差异，从而导致健康和COVID-19咳嗽之间的功率光谱密度显着不同，这表明了新数据集的一致性及其在声学上的解释性的一致性。最后，我们演示了如何使用重新标记的数据集来训练咳嗽分类器。这种SSL方法可用于结合几位专家的医学知识，以提高任何诊断分类任务的数据库一致性。
Cough audio signal classification is a potentially useful tool in screening for respiratory disorders, such as COVID-19. Since it is dangerous to collect data from patients with such contagious diseases, many research teams have turned to crowdsourcing to quickly gather cough sound data, as it was done to generate the COUGHVID dataset. The COUGHVID dataset enlisted expert physicians to diagnose the underlying diseases present in a limited number of uploaded recordings. However, this approach suffers from potential mislabeling of the coughs, as well as notable disagreement between experts. In this work, we use a semi-supervised learning (SSL) approach to improve the labeling consistency of the COUGHVID dataset and the robustness of COVID-19 versus healthy cough sound classification. First, we leverage existing SSL expert knowledge aggregation techniques to overcome the labeling inconsistencies and sparsity in the dataset. Next, our SSL approach is used to identify a subsample of re-labeled COUGHVID audio samples that can be used to train or augment future cough classification models. The consistency of the re-labeled data is demonstrated in that it exhibits a high degree of class separability, 3x higher than that of the user-labeled data, despite the expert label inconsistency present in the original dataset. Furthermore, the spectral differences in the user-labeled audio segments are amplified in the re-labeled data, resulting in significantly different power spectral densities between healthy and COVID-19 coughs, which demonstrates both the increased consistency of the new dataset and its explainability from an acoustic perspective. Finally, we demonstrate how the re-labeled dataset can be used to train a cough classifier. This SSL approach can be used to combine the medical knowledge of several experts to improve the database consistency for any diagnostic classification task.
