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Deep learning approximations for non-local nonlinear PDEs with Neumann boundary conditions

Author

Listed:
  • Victor Boussange

    (Swiss Federal Research Institute for Forest, Snow and Landscape (WSL)
    ETH Zürich)

  • Sebastian Becker

    (ETH Zürich)

  • Arnulf Jentzen

    (The Chinese University of Hong Kong, Shenzhen
    University of Münster)

  • Benno Kuckuck

    (University of Münster)

  • Loïc Pellissier

    (Swiss Federal Research Institute for Forest, Snow and Landscape (WSL)
    ETH Zürich)

Abstract

Nonlinear partial differential equations (PDEs) are used to model dynamical processes in a large number of scientific fields, ranging from finance to biology. In many applications standard local models are not sufficient to accurately account for certain non-local phenomena such as, e.g., interactions at a distance. Non-local nonlinear PDE models can accurately capture these phenomena, but traditional numerical approximation methods are infeasible when the considered non-local PDE is high-dimensional. In this article we propose two numerical methods based on machine learning and on Picard iterations, respectively, to approximately solve non-local nonlinear PDEs. The proposed machine learning-based method is an extended variant of a deep learning-based splitting-up type approximation method previously introduced in the literature and utilizes neural networks to provide approximate solutions on a subset of the spatial domain of the solution. The Picard iterations-based method is an extended variant of the so-called full history recursive multilevel Picard approximation scheme previously introduced in the literature and provides an approximate solution for a single point of the domain. Both methods are mesh-free and allow non-local nonlinear PDEs with Neumann boundary conditions to be solved in high dimensions. In the two methods, the numerical difficulties arising due to the dimensionality of the PDEs are avoided by (i) using the correspondence between the expected trajectory of reflected stochastic processes and the solution of PDEs (given by the Feynman–Kac formula) and by (ii) using a plain vanilla Monte Carlo integration to handle the non-local term. We evaluate the performance of the two methods on five different PDEs arising in physics and biology. In all cases, the methods yield good results in up to 10 dimensions with short run times. Our work extends recently developed methods to overcome the curse of dimensionality in solving PDEs.

Suggested Citation

  • Victor Boussange & Sebastian Becker & Arnulf Jentzen & Benno Kuckuck & Loïc Pellissier, 2023. "Deep learning approximations for non-local nonlinear PDEs with Neumann boundary conditions," Partial Differential Equations and Applications, Springer, vol. 4(6), pages 1-51, December.
    • Handle: RePEc:spr:pardea:v:4:y:2023:i:6:d:10.1007_s42985-023-00244-0
    DOI: 10.1007/s42985-023-00244-0
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    References listed on IDEAS

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