arXiv:2602.09487cs.LGcs.NA2026-02

无需物理残差项,用自适应循环训练实现反应扩散系统的稳定长时预测。

Adaptive recurrent flow map operator learning for reaction diffusion dynamics

  • 设计轻量级验证节点,动态退出无效预测段并重定向优化路径。
  • 仅用短时数据训练,即可在多个系统上零样本泛化且保持长期稳定。
  • 相比物理残差方法速度提升数倍,训练成本更低且对分布外数据更鲁棒。

反应-扩散(RD)方程描述了化学、生物与物理中的模式形成现象,但从数据中学习能稳定预测其长期动态的算子仍具挑战。神经算子代理可实现分辨率不变预测,但自回归滚动易因误差累积而漂移,且分布外初始条件常导致精度下降。基于物理的数值残差目标虽可正则化学习,但引入额外假设、对离散化敏感、损失设计复杂且训练成本高。本文提出纯数据驱动的算子学习器DDOL-ART,采用自适应循环训练策略,结合轻量级验证里程碑,可提前退出无效滚动段并重定向优化。仅在单一分布内环面高斯族上进行短时训练,该方法学习的一步算子在长时滚动中保持稳定,并零样本推广至FitzHugh-Nagumo(FN)、Gray-Scott(GS)和Lambda-Omega(LO)系统中的强形态变化。在这些基准测试中,DDOL-ART实现了优异的精度与成本权衡:在相同设置下比基于物理残差的算子学习器(NLOL)快数倍,同时在分布内稳定性与分布外鲁棒性上均保持竞争力。训练动态分析显示,自适应机制增强了验证误差与分布外测试误差之间的相关性,充当反馈控制器以抑制优化漂移。结果表明,通过反馈控制的循环训练,DDOL-ART可在不依赖偏微分方程残差的前提下生成稳健的流映射代理,且训练成本显著低于NLOL。

原文摘要 · Abstract (English)

Reaction-diffusion (RD) equations underpin pattern formation across chemistry, biology, and physics, yet learning stable operators that forecast their long-term dynamics from data remains challenging. Neural-operator surrogates provide resolution-robust prediction, but autoregressive rollouts can drift due to the accumulation of error, and out-of-distribution (OOD) initial conditions often degrade accuracy. Physics-based numerical residual objectives can regularize operator learning, although they introduce additional assumptions, sensitivity to discretization and loss design, and higher training cost. Here we develop a purely data-driven operator learner with adaptive recurrent training (DDOL-ART) using a robust recurrent strategy with lightweight validation milestones that early-exit unproductive rollout segments and redirect optimization. Trained only on a single in-distribution toroidal Gaussian family over short horizons, DDOL-ART learns one-step operators that remain stable under long rollouts and generalize zero-shot to strong morphology shifts across FitzHugh-Nagumo (FN), Gray-Scott (GS), and Lambda-Omega (LO) systems. Across these benchmarks, DDOL-ART delivers a strong accuracy and cost trade-off. It is several-fold faster than a physics-based numerical-loss operator learner (NLOL) under matched settings, and it remains competitive on both in-distribution stability and OOD robustness. Training-dynamics diagnostics show that adaptivity strengthens the correlation between validation error and OOD test error performance, acting as a feedback controller that limits optimization drift. Our results indicate that feedback-controlled recurrent training of DDOL-ART generates robust flow-map surrogates without PDE residuals, while simultaneously maintaining competitiveness with NLOL at significantly reduced training costs.

反应扩散神经算子自适应训练零样本泛化

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