跨中心ICU数据缺失问题,用联邦马尔可夫方法隐私协作补全。
Federated Markov Imputation: Privacy-Preserving Temporal Imputation in Multi-Centric ICU Environments
- 基于联邦学习的马尔可夫模型,实现多中心时间序列数据协同补全。
- 在MIMIC-IV数据集上,对齐不规则采样场景,补全精度显著优于本地方法。
- 适合关注医疗数据隐私与跨机构协作的临床研究者。
电子健康记录中的缺失数据是联邦学习面临的持续挑战,尤其在不同机构以异构时间粒度采集时序数据时。为此,我们提出联邦马尔可夫补全(Federated Markov Imputation, FMI),一种隐私保护方法,使重症监护室(ICUs)能够协作构建全局的时间转移模型,用于时序数据补全。我们在真实世界脓毒症发病预测任务中使用MIMIC-IV数据集评估FMI,结果表明其在各ICU采样间隔不规则的场景下,显著优于本地补全基线方法。
原文摘要 · Abstract (English)
Missing data is a persistent challenge in federated learning on electronic health records, particularly when institutions collect time-series data at varying temporal granularities. To address this, we propose Federated Markov Imputation (FMI), a privacy-preserving method that enables Intensive Care Units (ICUs) to collaboratively build global transition models for temporal imputation. We evaluate FMI on a real-world sepsis onset prediction task using the MIMIC-IV dataset and show that it outperforms local imputation baselines, especially in scenarios with irregular sampling intervals across ICUs.
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