arXiv:2604.19296cs.LG2026-04被引 1

提出DOPE方法,精准估算物理系统轨迹的量化指标。

Debiased neural operators for estimating functionals

论文配图:Debiased neural operators for estimating functionals
图 1 · 摘自论文原文
  • 将神经算子视为高维干扰映射,设计去偏估计器
  • 相比直接代入,误差降低显著,实验验证有效
  • 适合不完整或不规则观测场景,通用性强

神经算子广泛用于近似复杂物理系统的解映射。但在许多应用中,目标并非恢复完整的解轨迹,而是通过标量目标量(如目标区间停留时间、超过阈值时间、累计成本或总能量等函数)总结轨迹。本文提出DOPE(去偏神经算子):一种针对此类目标量的半参数估计方法。DOPE适用于部分观测和不规则观测场景,可与任意神经算子架构结合。主要贡献有三:(1)表明直接代入估计存在一阶偏差;(2)推导出一种新型一步式、奈曼正交估计器,将神经算子视为函数空间间的高维干扰映射,消除主导偏差项;该方法通过加权机制同时考虑观测设计不规则性及目标量对轨迹扰动的敏感度;(3)通过瑞斯回归扩展自动去偏机器学习,以学习权重。在多个数值实验中验证了DOPE的优势。

原文摘要 · Abstract (English)

Neural operators are widely used to approximate solution maps of complex physical systems. In many applications, however, the goal is not to recover the full solution trajectory, but to summarize the solution trajectory via a scalar target quantity (e.g., a functional such as time spent in a target range, time above a threshold, accumulated cost, or total energy). In this paper, we introduce DOPE (debiased neural operator): a semiparametric estimator for such target quantities of solution trajectories obtained from neural operators. DOPE is broadly applicable to settings with both partial and irregular observations and can be combined with arbitrary neural operator architectures. We make three main contributions. (1) We show that, in contrast to DOPE, naive plug-in estimation can suffer from first-order bias. (2) To address this, we derive a novel one-step, Neyman-orthogonal estimator that treats the neural operator as a high-dimensional nuisance mapping between function spaces, and removes the leading bias term. For this, DOPE uses a weighting mechanism that simultaneously accounts for irregular observation designs and for how sensitive the target quantity is to perturbations of the underlying trajectory. (3) To learn the weights, we extend automatic debiased machine learning to operator-valued nuisances via Riesz regression. We demonstrate the benefits of DOPE across various numerical experiments.

神经算子去偏估计函数量机器学习

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