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arXiv 1709.04562math.NAcs.NA
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通过导数估计实现高效的自适应稀疏网格插值方法

An efficient adaptive sparse grid collocation method through derivative estimation

Johns Hopkins University(约翰斯·霍普金斯大学)

Anindya Bhaduri, Lori Graham-Brady

AI总结:

本文提出一种基于导数估计的自适应稀疏网格方法,有效追踪局部行为并减少平滑区域的函数评估次数,适用于高维随机问题。

摘要:

对于高复杂性和/或非线性问题的不确定性传播,必须采用基于样本的非侵入性方法。在这些情况下,最小化评估响应面所需函数评估次数至关重要。稀疏网格方法已被证明能有效减少样本评估次数。例如,离散投影插值法在近似光滑函数时具有快速收敛率,但无法准确高效跟踪响应函数在输入域局部区域的波动、突变或不连续。另一方面,分段线性插值法可以高效跟踪这些局部变化,但在平滑区域收敛较慢。所提出的方法基于现有的自适应分层稀疏网格插值算法,通过在所有维度上使用基于有限差分的一维导数评估技术,能够跟踪局部行为并避免在平滑区域进行不必要的函数评估。该导数评估技术在平滑区域的收敛速度比现有插值方法更快。示例表明,该方法适用于高维随机问题,且可有效处理随机椭圆问题,其随机维度高达100。

英文摘要:

For uncertainty propagation of highly complex and/or nonlinear problems, one must resort to sample-based non-intrusive approaches [1]. In such cases, minimizing the number of function evaluations required to evaluate the response surface is of paramount importance. Sparse grid approaches have proven effective in reducing the number of sample evaluations. For example, the discrete projection collocation method has the notable feature of exhibiting fast convergence rates when approximating smooth functions; however, it lacks the ability to accurately and efficiently track response functions that exhibit fluctuations, abrupt changes or discontinuities in very localized regions of the input domain. On the other hand, the piecewise linear collocation interpolation approach can track these localized variations in the response surface efficiently, but it converges slowly in the smooth regions. The proposed methodology, building on an existing work on adaptive hierarchical sparse grid collocation algorithm [2], is able to track localized behavior while also avoiding unnecessary function evaluations in smoother regions of the stochastic space by using a finite difference based one-dimensional derivative evaluation technique in all the dimensions. This derivative evaluation technique leads to faster convergence in the smoother regions than what is achieved in the existing collocation interpolation approaches. Illustrative examples show that this method is well suited to high-dimensional stochastic problems, and that stochastic elliptic problems with stochastic dimension as high as 100 can be dealt with effectively.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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