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arXiv 2103.08915math.NAcs.NA
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一种求解高阶偏微分方程的局部深度学习方法

A Local Deep Learning Method for Solving High Order Partial Differential Equations

Quanhui Zhu, Jiang Yang

摘要:

目前,基于深度学习的方法正被用于解决高维偏微分方程(PDE)的计算挑战。但是神经网络高阶导数的计算代价很高,而且高阶导数对训练缺乏鲁棒性。我们提出了一种通过同时逼近函数值和导数来求解具有高阶导数的偏微分方程的新方法。与局部间断Galerkin方法一样,我们引入中间变量将偏微分方程改写成一个低阶微分方程。中间变量和偏微分方程的解同时由多输出深度神经网络近似。通过将系统的残差作为损失函数,我们可以优化网络参数以逼近解。整个过程依赖于低阶导数。大量的数值例子表明,我们的局部深度学习是有效的,鲁棒的,灵活的,特别适合于具有高阶导数的高维偏微分方程。

英文摘要:

At present, deep learning based methods are being employed to resolve the computational challenges of high-dimensional partial differential equations (PDEs). But the computation of the high order derivatives of neural networks is costly, and high order derivatives lack robustness for training purposes. We propose a novel approach to solving PDEs with high order derivatives by simultaneously approximating the function value and derivatives. We introduce intermediate variables to rewrite the PDEs into a system of low order differential equations as what is done in the local discontinuous Galerkin method. The intermediate variables and the solutions to the PDEs are simultaneously approximated by a multi-output deep neural network. By taking the residual of the system as a loss function, we can optimize the network parameters to approximate the solution. The whole process relies on low order derivatives. Numerous numerical examples are carried out to demonstrate that our local deep learning is efficient, robust, flexible, and is particularly well-suited for high-dimensional PDEs with high order derivatives.

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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