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新的动力学理论正式化了零阶牛顿方法

研究人员为零阶牛顿型方法开发了正式的动力学理论,这在梯度和Hessian不可用时很有用。该框架包括一个高斯-斯坦(Gaussian-Stein)校正,用于准确估计平滑目标函数的Hessian。分析揭示了影响更新的两个噪声通道:一个来自梯度噪声,另一个来自Hessian噪声,在有噪声的Oracle条件下,后者携带一个重要的因子。动力学提升将有限步牛顿更新与欠阻尼相空间模型联系起来,产生了一个Lyapunov界限,突出了曲率与方差在步长、批次大小和正则化方面的权衡。 AI

影响 这项研究为无梯度优化方法提供了理论基础,有可能提高在梯度难以计算或无法计算时训练AI模型的效率。

排序理由 该集群包含一篇详细介绍优化方法新理论框架的学术论文。[lever_c_demoted from research: ic=1 ai=0.7]

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新的动力学理论正式化了零阶牛顿方法

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该集群包含一篇详细介绍优化方法新理论框架的学术论文。[lever_c_demoted from research: ic=1 ai=0.7]
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报道来源 [1]

  1. arXiv cs.AI TIER_1 English(EN) · Shihao Ji, Mingyu Li, Zihui Song ·

    零阶牛顿动力学的形式动力学理论:Stein校正Hessian估计与曲率-方差权衡

    arXiv:2607.22567v1 Announce Type: cross Abstract: Zeroth-order Newton-type methods are useful when gradients and Hessians are unavailable, but they behave quite differently from first-order gradient-free methods. We develop a kinetic framework for algorithms that estimate both gr…