让物理规律在模型潜空间中自动满足,提升科学机器学习的可靠性。
Physics-conforming Latent Twins

- 通过潜空间动力学设计,强制模型遵守能量、动量等物理守恒律。
- 在常微分方程与偏微分方程测试中,物理约束满足度显著提升。
- 适合需要长期稳定模拟的物理系统建模,如流体、结构力学。
代理模型是科学机器学习的核心,可快速预测、模拟、推断和控制复杂物理系统。然而,对于时变问题,仅准确插值训练轨迹并不足够:可靠的代理模型还必须遵循守恒律、不变量、可接受性条件及耗散结构,这些赋予轨迹物理意义。我们提出物理符合的潜空间双生模型(Physics-conforming Latent Twins),一种学习潜空间代理解算子的框架,其动态过程通过设计满足特定物理原理。该方法基于潜空间双生结构,联合学习编码器、解码器与任意时间点状态间的潜流映射,并约束潜空间动力学以保持或耗散预设结构量。我们提出了约束转移视角,将原始状态空间中的物理结构与潜空间中的兼容约束相联系,并证明了结构保持界限,表明潜空间约束能有效降低解码后的物理缺陷。我们还推导出保持线性和二次不变量或强制耗散不等式的潜流映射代数条件。在典型的常微分方程与偏微分方程基准测试中,该方法在保持高精度预测的同时,显著提升了约束满足度、结构保真度及长期行为的定性质量。
原文摘要 · Abstract (English)
Surrogate models are central to scientific machine learning, where they enable fast prediction, simulation, inference, and control for complex physical systems. For time-dependent problems, however, accurate interpolation of training trajectories is not sufficient: reliable surrogates should also respect the conservation laws, invariants, admissibility conditions, and dissipative structures that give those trajectories physical meaning. We introduce Physics-conforming Latent Twins, a framework for learning latent surrogate solution operators whose dynamics satisfy selected physical principles by design. The method builds on the Latent Twin formulation by jointly learning an encoder, a decoder, and a latent flow map between arbitrary time-indexed states, while constraining the latent dynamics to preserve or dissipate prescribed structural quantities. We develop a constraint-transfer viewpoint that connects physical structure in the original state space with compatible constraints in latent space, and prove structure-preservation bounds showing how latent enforcement improves control of physical defects after decoding. We also derive algebraic conditions for latent flow maps that preserve linear and quadratic invariants or enforce dissipative inequalities. Numerical experiments on representative ODE and PDE benchmarks demonstrate improved constraint satisfaction, structural fidelity, and qualitative long-time behavior while maintaining accurate surrogate prediction.
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