Deep-learning based discovery of partial differential equations in integral form from sparse and noisy data

TL;DR

This paper introduces a deep learning framework that uses integral forms and genetic algorithms to accurately discover complex PDEs from sparse, noisy data, outperforming existing methods in robustness and precision.

Contribution

It presents a novel deep learning approach combining integral form and genetic algorithms for robust PDE discovery from challenging data conditions.

Findings

More robust to noise than existing methods

Accurately discovers high-order and heterogeneous PDEs

Effective with sparse data

Abstract

Data-driven discovery of partial differential equations (PDEs) has attracted increasing attention in recent years. Although significant progress has been made, certain unresolved issues remain. For example, for PDEs with high-order derivatives, the performance of existing methods is unsatisfactory, especially when the data are sparse and noisy. It is also difficult to discover heterogeneous parametric PDEs where heterogeneous parameters are embedded in the partial differential operators. In this work, a new framework combining deep-learning and integral form is proposed to handle the above-mentioned problems simultaneously, and improve the accuracy and stability of PDE discovery. In the framework, a deep neural network is firstly trained with observation data to generate meta-data and calculate derivatives. Then, a unified integral form is defined, and the genetic algorithm is employed to discover the best structure. Finally, the value of parameters is calculated, and whether the parameters are constants or variables is identified. Numerical experiments proved that our proposed algorithm is more robust to noise and more accurate compared with existing methods due to the utilization of integral form. Our proposed algorithm is also able to discover PDEs with high-order derivatives or heterogeneous parameters accurately with sparse and noisy data.