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Any equation is a forest: Symbolic genetic algorithm for discovering open-form partial differential equations (SGA-PDE)

9 Jun 2021arXiv:2106.11927archive 2025-07-28

Yuntian Chen, Yingtao Luo, Qiang Liu, Hao Xu, Dongxiao Zhang

Partial differential equations (PDEs) are concise and understandable representations of domain knowledge, which are essential for deepening our understanding of physical processes and predicting future responses. However, the PDEs of many real-world problems are uncertain, which calls for PDE discovery. We propose the symbolic genetic algorithm (SGA-PDE) to discover open-form PDEs directly from data without prior knowledge about the equation structure. SGA-PDE focuses on the representation and optimization of PDE. Firstly, SGA-PDE uses symbolic mathematics to realize the flexible representation of any given PDE, transforms a PDE into a forest, and converts each function term into a binary tree. Secondly, SGA-PDE adopts a specially designed genetic algorithm to efficiently optimize the binary trees by iteratively updating the tree topology and node attributes. The SGA-PDE is gradient-free, which is a desirable characteristic in PDE discovery since it is difficult to obtain the gradient between the PDE loss and the PDE structure. In the experiment, SGA-PDE not only successfully discovered nonlinear Burgers' equation, Korteweg-de Vries (KdV) equation, and Chafee-Infante equation, but also handled PDEs with fractional structure and compound functions that cannot be solved by conventional PDE discovery methods.

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divide YuntianChen/SGA-PDE/codes/configure.py official repository ran · violated contract fingerprinted MIT (permissive) · c6fbd09210e67c4a · report
Diff yingtaoluo/PDE-Discovery-with-Evolutionary-Tree-Search/PDE_find.py community (archive-listed) ran · fixture could not drive it fingerprinted no licence file found · pointer only · e40d4a2dcd4267d7 · report
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Train yingtaoluo/PDE-Discovery-with-Evolutionary-Tree-Search/PDE_find.py community (archive-listed) ran · our draft was wrong fingerprinted no licence file found · pointer only · 2d11d7f451e6ee66 · report

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