GPT-PINN: Generative Pre-Trained Physics-Informed Neural Networks toward non-intrusive Meta-learning of parametric PDEs

Physics-Informed Neural Network (PINN) has proven itself a powerful tool to obtain the numerical solutions of nonlinear partial differential equations (PDEs) leveraging the expressivity of deep neural networks and the computing power of modern heterogeneous hardware. However, its training is still t...

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Vydané v:	Finite elements in analysis and design Ročník 228; s. 104047
Hlavní autori:	Chen, Yanlai, Koohy, Shawn
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	Elsevier B.V 01.01.2024
Predmet:	Meta-learning model order reduction Network of networks Non-intrusive learning Parametric PDEs Physics-Informed Neural Networks Physics-Informed Neural Networks Parametric PDEs Non-intrusive learning model order reduction Meta-learning Network of networks
ISSN:	0168-874X, 1872-6925
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Popis
Shrnutí:	Physics-Informed Neural Network (PINN) has proven itself a powerful tool to obtain the numerical solutions of nonlinear partial differential equations (PDEs) leveraging the expressivity of deep neural networks and the computing power of modern heterogeneous hardware. However, its training is still time-consuming, especially in the multi-query and real-time simulation settings, and its parameterization often overly excessive. In this paper, we propose the Generative Pre-Trained PINN (GPT-PINN) to mitigate both challenges in the setting of parametric PDEs. GPT-PINN represents a brand-new meta-learning paradigm for parametric systems. As a network of networks, its outer-/meta-network is hyper-reduced with only one hidden layer having significantly reduced number of neurons. Moreover, its activation function at each hidden neuron is a (full) PINN pre-trained at a judiciously selected system configuration. The meta-network adaptively “learns” the parametric dependence of the system and “grows” this hidden layer one neuron at a time. In the end, by encompassing a very small number of networks trained at this set of adaptively-selected parameter values, the meta-network is capable of generating surrogate solutions for the parametric system across the entire parameter domain accurately and efficiently. •The use of whole pre-trained networks as the activation functions of another network•A network of networks that is adaptively generated•The adoption of the training loss of the meta-network as an error indicator•The adaptation of the classical greedy algorithm to the neural network setting
ISSN:	0168-874X 1872-6925
DOI:	10.1016/j.finel.2023.104047