arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2206.12901math.NAcs.AIcs.LGcs.NAphysics.comp-ph
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基于噪声感知的物理信息机器学习的稳健PDE发现

Noise-aware Physics-informed Machine Learning for Robust PDE Discovery

Osaka University(大阪大学)

Pongpisit Thanasutives, Takashi Morita, Masayuki Numao, Ken-ichi Fukui

摘要:

本工作是关于发现一个物理系统的偏微分方程(PDE)。现有的方法已经证明了PDE识别从有限的观察,但未能保持令人满意的结果对噪声数据,部分原因是次优估计的衍生物和发现PDE系数。我们通过引入噪声感知物理信息机器学习(nPIML)框架来解决这些问题,以从遵循任意分布的数据中发现管理PDE。我们建议在多任务学习范式中训练一对神经网络,即求解器和预选器,这会产生构成隐藏物理约束的基础候选人的重要分数。在它们被联合训练之后,求解器网络估计潜在的候选者,例如,偏导数,用于稀疏回归算法初始揭示最可能的简约PDE,根据信息准则来决定。我们还提出了基于离散傅里叶变换(DFT)的去噪物理信息神经网络(dPINNs),以提供一组关于噪声降低变量的最佳微调PDE系数。去噪PINN被构造成最前沿投影网络和PINN,通过PINN,以前学习的求解器进行迭代。我们对五个典型偏微分方程的广泛实验证实,所提出的框架提出了一个强大的和可解释的偏微分方程发现的方法,适用于广泛的系统,可能复杂的噪声。

英文摘要:

This work is concerned with discovering the governing partial differential equation (PDE) of a physical system. Existing methods have demonstrated the PDE identification from finite observations but failed to maintain satisfying results against noisy data, partly owing to suboptimal estimated derivatives and found PDE coefficients. We address the issues by introducing a noise-aware physics-informed machine learning (nPIML) framework to discover the governing PDE from data following arbitrary distributions. We propose training a couple of neural networks, namely solver and preselector, in a multi-task learning paradigm, which yields important scores of basis candidates that constitute the hidden physical constraint. After they are jointly trained, the solver network estimates potential candidates, e.g., partial derivatives, for the sparse regression algorithm to initially unveil the most likely parsimonious PDE, decided according to the information criterion. We also propose the denoising physics-informed neural networks (dPINNs), based on Discrete Fourier Transform (DFT), to deliver a set of the optimal finetuned PDE coefficients respecting the noise-reduced variables. The denoising PINNs are structured into forefront projection networks and a PINN, by which the formerly learned solver initializes. Our extensive experiments on five canonical PDEs affirm that the proposed framework presents a robust and interpretable approach for PDE discovery, applicable to a wide range of systems, possibly complicated by noise.

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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