将物理定律融入潜空间神经算子,实现高维时变偏微分方程的实时精准预测。
Physics-Informed Latent Neural Operator for Real-time Predictions of time-dependent parametric PDEs
- 构建双分支深度算子网络,先降维再重建,融合物理约束提升泛化能力。
- 无需标签数据即可训练,在多个参数化偏微分方程上实现亚秒级推理速度。
- 适合需要快速仿真与物理一致性保障的复杂系统建模场景。
深度算子网络(DeepONet)在求解由偏微分方程(PDE)支配的系统方面展现出巨大潜力,能够实现无限维函数空间间的精确映射。然而,当输入输出维度因大量时空采样点而升高时,传统模型常需过度参数化网络,导致训练耗时过长。潜空间深度算子网络(Latent DeepONet)通过两步法缓解此问题:先用独立模型学习低维潜空间表示,再在潜空间中进行算子学习。尽管高效,该方法完全依赖数据驱动,缺乏物理规律的显式约束,限制了其在数据稀缺场景下的鲁棒性与泛化能力。本文提出物理信息潜空间神经算子(PI-Latent-NO),将控制方程直接嵌入学习过程。该框架包含两个端到端训练的深度算子网络:潜空间-深度算子网络负责学习解的低维表示,重建-深度算子网络则将潜表示映射回物理空间。通过自动微分引入PDE约束,模型无需标签数据即可训练,并保证预测结果满足物理一致性。所提方法在内存与计算上均具高效性,问题规模扩展时性能近乎恒定,相较传统物理信息算子模型显著提速。我们在多种参数化偏微分方程上验证了该方法的准确性、可扩展性及在复杂物理系统中的实时预测适用性。
原文摘要 · Abstract (English)
Deep operator network (DeepONet) has shown significant promise as surrogate models for systems governed by partial differential equations (PDEs), enabling accurate mappings between infinite-dimensional function spaces. However, when applied to systems with high-dimensional input-output mappings arising from large numbers of spatial and temporal collocation points, these models often require heavily overparameterized networks, leading to long training times. Latent DeepONet addresses some of these challenges by introducing a two-step approach: first learning a reduced latent space using a separate model, followed by operator learning within this latent space. While efficient, this method is inherently data-driven and lacks mechanisms for incorporating physical laws, limiting its robustness and generalizability in data-scarce settings. In this work, we propose PI-Latent-NO, a physics-informed latent neural operator framework that integrates governing physics directly into the learning process. Our architecture features two coupled DeepONets trained end-to-end: a Latent-DeepONet that learns a low-dimensional representation of the solution, and a Reconstruction-DeepONet that maps this latent representation back to the physical space. By embedding PDE constraints into the training via automatic differentiation, our method eliminates the need for labeled training data and ensures physics-consistent predictions. The proposed framework is both memory and compute-efficient, exhibiting near-constant scaling with problem size and demonstrating significant speedups over traditional physics-informed operator models. We validate our approach on a range of parametric PDEs, showcasing its accuracy, scalability, and suitability for real-time prediction in complex physical systems.
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