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arXiv 2409.09137math.NAcs.NA
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大规模贝叶斯非线性反问题的鲁棒最优设计

Robust optimal design of large-scale Bayesian nonlinear inverse problems

North Carolina State University(北卡罗来纳州立大学);Argonne National Laboratory(阿贡国家实验室)

Abhijit Chowdhary, Ahmed Attia, Alen Alexanderian

AI总结:

本文提出了一种针对非线性贝叶斯反问题的鲁棒最优实验设计框架,通过考虑不确定性因素,提升设计的鲁棒性,并在椭圆偏微分方程反问题中验证了其有效性。

摘要:

我们考虑了由偏微分方程(PDE)约束的非线性贝叶斯反问题的鲁棒最优实验设计(ROED)。最优设计是最大化某些效用函数以量化反问题解质量的设计。然而,最优设计依赖于反问题中的元素,如模拟模型、先验或测量误差模型。ROED旨在产生一种最优设计,能够意识到反问题中编码的额外不确定性,并在这些不确定性变化后仍保持最优。我们采用最坏情况场景方法,开发了一种新的鲁棒非线性贝叶斯反问题最优设计框架。该框架a) 可扩展且适用于由PDE约束的无限维贝叶斯非线性反问题;b) 开发了效用的高效近似,即预期信息增益;c) 运用特征值敏感性技术,开发了关于希望鲁棒对抗的不确定性的效用梯度的分析形式和高效评估方法;d) 运用概率优化范式,正确定义并高效解决由此产生的组合最大-最小优化问题。所提出方法的有效性在由椭圆PDE约束的反问题中的最优传感器布置问题中进行了验证。

英文摘要:

We consider robust optimal experimental design (ROED) for nonlinear Bayesian inverse problems governed by partial differential equations (PDEs). An optimal design is one that maximizes some utility quantifying the quality of the solution of an inverse problem. However, the optimal design is dependent on elements of the inverse problem such as the simulation model, the prior, or the measurement error model. ROED aims to produce an optimal design that is aware of the additional uncertainties encoded in the inverse problem and remains optimal even after variations in them. We follow a worst-case scenario approach to develop a new framework for robust optimal design of nonlinear Bayesian inverse problems. The proposed framework a) is scalable and designed for infinite-dimensional Bayesian nonlinear inverse problems constrained by PDEs; b) develops efficient approximations of the utility, namely, the expected information gain; c) employs eigenvalue sensitivity techniques to develop analytical forms and efficient evaluation methods of the gradient of the utility with respect to the uncertainties we wish to be robust against; and d) employs a probabilistic optimization paradigm that properly defines and efficiently solves the resulting combinatorial max-min optimization problem. The effectiveness of the proposed approach is illustrated for optimal sensor placement problem in an inverse problem governed by an elliptic PDE.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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