arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.03180math.NAcs.LGcs.NAstat.ML
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参数偏微分方程的模型降阶与神经网络

Model Reduction and Neural Networks for Parametric PDEs

California Institute of Technology(加州理工学院)

Kaushik Bhattacharya, Bamdad Hosseini, Nikola B. Kovachki, Andrew M. Stuart

摘要:

我们开发了一个通用的框架数据驱动的近似输入输出映射之间的无限维空间。所提出的方法受到神经网络和深度学习最近成功的启发,并结合了模型简化的想法。这种组合导致神经网络近似,其原则上定义在无限维空间上,并且在实践中,对于计算所需的这些空间的有限维近似的维度是鲁棒的。对于一类输入-输出映射,并适当地选择输入的概率测度,我们证明了所提出的近似方法的收敛性。我们还包括数值实验,证明了该方法的有效性,显示收敛性和鲁棒性的近似方案的离散化的大小,并比较它与现有的算法从文献中,我们的例子包括从系数映射到解决方案中的散度型椭圆偏微分方程(PDE)问题,和粘性Burgers方程的解决方案运营商。

英文摘要:

We develop a general framework for data-driven approximation of input-output maps between infinite-dimensional spaces. The proposed approach is motivated by the recent successes of neural networks and deep learning, in combination with ideas from model reduction. This combination results in a neural network approximation which, in principle, is defined on infinite-dimensional spaces and, in practice, is robust to the dimension of finite-dimensional approximations of these spaces required for computation. For a class of input-output maps, and suitably chosen probability measures on the inputs, we prove convergence of the proposed approximation methodology. We also include numerical experiments which demonstrate the effectiveness of the method, showing convergence and robustness of the approximation scheme with respect to the size of the discretization, and compare it with existing algorithms from the literature; our examples include the mapping from coefficient to solution in a divergence form elliptic partial differential equation (PDE) problem, and the solution operator for viscous Burgers' equation.

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