Learning Neural Operators for Biological Tissue Modeling

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• Yue Yu (Lehigh University)
• Thursday 03 August 2023, 10:00-11:00
• Seminar Room 1, Newton Institute.

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USMW02 - Mathematical mechanical biology: old school and new school, methods and applications

For many decades, physics-based PDEs have been commonly employed for modeling the mechanical responses of biological tissues, then traditional numerical methods were employed to solve the PDEs and provide predictions. However, when governing laws are unknown or when high degrees of heterogeneity present, these classical models may become inaccurate. In this talk we propose to use data-driven modeling which directly utilizes experimental measurements to learn the hidden physics and provide further predictions. In particular, we develop PDE -inspired neural operator architectures, to learn the mapping between loading conditions and the corresponding mechanical responses. By parameterizing the increment between layers as an integral operator, our neural operator can be seen as the analog of a time-dependent nonlocal equation, which captures the long-range dependencies in the feature space and is guaranteed to be resolution-independent. Moreover, when applying to (hidden) PDE solving tasks, our neural operator provides a universal approximator to a fixed point iterative procedure, and partial physical knowledge can be incorporated to further improve the model’s generalizability and transferability. As a real-world application, we learn the material models directly from digital image correlation (DIC) displacement tracking measurements on a porcine tricuspid valve leaflet tissue, and show that the learnt model substantially outperforms conventional constitutive models.

This talk is part of the Isaac Newton Institute Seminar Series series.

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