@Article{CiCP-28-5,
author = {Yufei, Wang and Ziju, Shen and Zichao, Long and Dong, Bin},
title = {Learning to Discretize: Solving 1D Scalar Conservation Laws via Deep Reinforcement Learning},
journal = {Communications in Computational Physics},
year = {2020},
volume = {28},
number = {5},
pages = {2158--2179},
abstract = {<p style="text-align: justify;">Conservation laws are considered to be fundamental laws of nature. It has
broad applications in many fields, including physics, chemistry, biology, geology, and
engineering. Solving the differential equations associated with conservation laws is a
major branch in computational mathematics. The recent success of machine learning,
especially deep learning in areas such as computer vision and natural language processing, has attracted a lot of attention from the community of computational mathematics and inspired many intriguing works in combining machine learning with traditional methods. In this paper, we are the first to view numerical PDE solvers as an
MDP and to use (deep) RL to learn new solvers. As proof of concept, we focus on
1-dimensional scalar conservation laws. We deploy the machinery of deep reinforcement learning to train a policy network that can decide on how the numerical solutions should be approximated in a sequential and spatial-temporal adaptive manner.
We will show that the problem of solving conservation laws can be naturally viewed
as a sequential decision-making process, and the numerical schemes learned in such a
way can easily enforce long-term accuracy. Furthermore, the learned policy network
is carefully designed to determine a good local discrete approximation based on the
current state of the solution, which essentially makes the proposed method a meta-learning approach. In other words, the proposed method is capable of learning how to
discretize for a given situation mimicking human experts. Finally, we will provide details on how the policy network is trained, how well it performs compared with some
state-of-the-art numerical solvers such as WENO schemes, and supervised learning
based approach L3D and PINN, and how well it generalizes.</p>},
issn = {1991-7120},
doi = {https://doi.org/10.4208/cicp.OA-2020-0194},
url = {https://global-sci.com/article/79752/learning-to-discretize-solving-1d-scalar-conservation-laws-via-deep-reinforcement-learning}
}