arXiv:2509.17293cs.LGeess.SP2025-09

用物理约束的神经算子替代复杂训练,高效建模心血管血流动力学。

Physics-Informed Operator Learning for Hemodynamic Modeling

  • 用预训练的物理约束算子做监督,指导轻量模型学习。
  • 性能媲美复杂模型(相关性0.766,RMSE 4.452),降低4%训练开销。
  • 适合需快速部署、可解释性强的临床生理建模场景。

精准的个性化心血管动力学建模对无创监测与治疗规划至关重要。现有基于物理信息神经网络(PINN)的方法采用深层多分支架构,结合对抗或对比目标以强制满足偏微分方程约束,虽有效但引入显著训练与实现复杂度,限制了可扩展性与实际部署。本文研究物理信息神经算子学习作为高效监督信号,通过知识蒸馏训练简化架构。方法先在高保真无袖带血压记录上预训练一个物理约束深度算子网络(PI-DeepONet),学习从可穿戴设备原始波形到逐搏压力信号的算子映射,并嵌入物理约束。该预训练算子作为冻结的监督器,在轻量知识蒸馏流程中指导去除了复杂对抗与对比学习组件的简化模型,同时保持性能。我们分析了物理信息正则化在算子学习中的作用,并验证其作为监督引导的有效性。大量实验表明,该算子监督方法在性能上与复杂基线相当(相关性:0.766 vs. 0.770,RMSE:4.452 vs. 4.501),将关键超参数从八个减少至单一正则化系数,训练开销下降4%。结果表明,算子监督能有效替代复杂的多组件训练策略,提供更可扩展、可解释且实施负担更低的生理建模方案。

原文摘要 · Abstract (English)

Accurate modeling of personalized cardiovascular dynamics is crucial for non-invasive monitoring and therapy planning. State-of-the-art physics-informed neural network (PINN) approaches employ deep, multi-branch architectures with adversarial or contrastive objectives to enforce partial differential equation constraints. While effective, these enhancements introduce significant training and implementation complexity, limiting scalability and practical deployment. We investigate physics-informed neural operator learning models as efficient supervisory signals for training simplified architectures through knowledge distillation. Our approach pre-trains a physics-informed DeepONet (PI-DeepONet) on high-fidelity cuffless blood pressure recordings to learn operator mappings from raw wearable waveforms to beat-to-beat pressure signals under embedded physics constraints. This pre-trained operator serves as a frozen supervisor in a lightweight knowledge-distillation pipeline, guiding streamlined base models that eliminate complex adversarial and contrastive learning components while maintaining performance. We characterize the role of physics-informed regularization in operator learning and demonstrate its effectiveness for supervisory guidance. Through extensive experiments, our operator-supervised approach achieves performance parity with complex baselines (correlation: 0.766 vs. 0.770, RMSE: 4.452 vs. 4.501), while dramatically reducing architectural complexity from eight critical hyperparameters to a single regularization coefficient and decreasing training overhead by 4%. Our results demonstrate that operator-based supervision effectively replaces intricate multi-component training strategies, offering a more scalable and interpretable approach to physiological modeling with reduced implementation burden.

生理建模神经算子物理约束知识蒸馏

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