arXiv:2512.17273cs.LGcs.NA2025-12被引 2

用神经网络统一求解复杂非局部时空问题,速度快且通用性强。

MINPO: Memory-Informed Neural Pseudo-Operator to Resolve Nonlocal Spatiotemporal Dynamics

  • 设计记忆感知的神经算子,直接学习非局部算子及其逆
  • 在多种核函数和维度下保持高精度,计算效率显著提升
  • 适合物理模拟、流体动力学等需要高效处理长程作用的场景

许多物理系统表现出由积分微分方程(IDEs)描述的非局部时空行为。传统求解方法需反复计算卷积积分,其代价随核函数复杂度和维度快速上升。现有神经求解器虽能加速特定实例,但难以跨不同非局部结构泛化。本文提出记忆感知神经伪算子(MINPO),一种统一框架,用于建模源自长程空间相互作用和/或长期时间记忆的非局部动态。MINPO采用KAN或MLP作为编码器,通过神经表示直接学习非局部算子及其逆,并显式重构未知解场。学习过程受轻量级非局部一致性损失约束,确保算子与重构解的一致性。该框架能自然捕捉并高效求解广泛类型的IDEs及其子类(包括分数阶PDEs)。在与经典方法及先进神经基策略(如A-PINN、fPINN及其KAN变体A-PIKAN、fPIKAN)的对比中,验证了MINPO在多样核类型、不同维度及重复核积分带来的高计算负载下的准确性和鲁棒性,具备超越特定问题形式的泛化能力,为非局部算子驱动系统提供统一求解方案。

原文摘要 · Abstract (English)

Many physical systems exhibit nonlocal spatiotemporal behaviors described by integro-differential equations (IDEs). Classical methods for solving IDEs require repeatedly evaluating convolution integrals, whose cost increases quickly with kernel complexity and dimensionality. Existing neural solvers can accelerate selected instances of these computations, yet they do not generalize across diverse nonlocal structures. In this work, we introduce the Memory-Informed Neural Pseudo-Operator (MINPO), a unified framework for modeling nonlocal dynamics arising from long-range spatial interactions and/or long-term temporal memory. MINPO, employing either Kolmogorov-Arnold Networks (KANs) or multilayer perceptron networks (MLPs) as encoders, learns the nonlocal operator and its inverse directly through neural representations, and then explicitly reconstruct the unknown solution fields. The learning is guarded by a lightweight nonlocal consistency loss term to enforce coherence between the learned operator and reconstructed solution. The MINPO formulation allows to naturally capture and efficiently resolve nonlocal spatiotemporal dependencies governed by a wide spectrum of IDEs and their subsets, including fractional PDEs. We evaluate the efficacy of MINPO in comparison with classical techniques and state-of-the-art neural-based strategies based on MLPs, such as A-PINN and fPINN, along with their newly-developed KAN variants, A-PIKAN and fPIKAN, designed to facilitate a fair comparison. Our study offers compelling evidence of the accuracy of MINPO and demonstrates its robustness in handling (i) diverse kernel types, (ii) different kernel dimensionalities, and (iii) the substantial computational demands arising from repeated evaluations of kernel integrals. MINPO, thus, generalizes beyond problem-specific formulations, providing a unified framework for systems governed by nonlocal operators.

非局部建模神经算子物理仿真积分微分方程

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