arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2407.14745math.NAcs.NA
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随机径向基函数神经网络求解多尺度椭圆方程

Randomized Radial Basis Function Neural Network for Solving Multiscale Elliptic Equations

Yuhang Wu, Ziyuan Liu, Wenjun Sun, Xu Qian

AI总结:

本文提出随机径向基函数神经网络(RRNN),通过子域分解和随机配点耦合求解多尺度椭圆方程,仅训练输出层权重,数值实验验证其精度和效率提升。

摘要:

为克服这些障碍并提高计算精度和效率,本文提出了随机径向基函数神经网络(RRNN),一种专门用于求解多尺度椭圆方程的创新方法。RRNN方法首先将计算域分解为不重叠的子域。在每个子域内,局部子问题的解通过具有高斯核的随机径向基函数神经网络来近似。该网络的显著特点是其激活函数的宽度和中心系数被随机分配,从而使得训练过程仅专注于确定输出层的权重系数。对于每个子问题,类似于Petrov-Galerkin有限元方法,基于弱形式构建一个线性系统。随后,在子域边界上随机采样一组配点,以确保满足$C^0$和$C^1$连续性以及边界条件,从而耦合这些局部解。最终,使用最小二乘法训练网络以确定输出层权重。为验证RRNN方法的有效性,进行了大量数值实验,结果表明所提方法能够很好地提高精度和效率。

英文摘要:

To overcome these obstacles and improve computational accuracy and efficiency, this paper presents the Randomized Radial Basis Function Neural Network (RRNN), an innovative approach explicitly crafted for solving multiscale elliptic equations. The RRNN method commences by decomposing the computational domain into non-overlapping subdomains. Within each subdomain, the solution to the localized subproblem is approximated by a randomized radial basis function neural network with a Gaussian kernel. This network is distinguished by the random assignment of width and center coefficients for its activation functions, thereby rendering the training process focused solely on determining the weight coefficients of the output layer. For each subproblem, similar to the Petrov-Galerkin finite element method, a linear system will be formulated on the foundation of a weak formulation. Subsequently, a selection of collocation points is stochastically sampled at the boundaries of the subdomain, ensuring satisfying $C^0$ and $C^1$ continuity and boundary conditions to couple these localized solutions. The network is ultimately trained using the least squares method to ascertain the output layer weights. To validate the RRNN method's effectiveness, an extensive array of numerical experiments has been executed and the results demonstrate that the proposed method can improve the accuracy and efficiency well.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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