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通过核密度估计学习转移算子

Learning Transfer Operators by Kernel Density Estimation

Yale University(耶鲁大学);Yale School of Public Health(耶鲁公共卫生学院);Clarkson University(克拉克森大学)

Sudam Surasinghe, Jeremie Fish, Erik M. Bollt

AI总结:

本文从统计密度估计视角重新表述转移算子推断问题,通过偏差-方差分析比较直方图与核密度估计,证明KDE在估计Frobenius-Perron算子特征向量时通常更准确,并指出其边界局限性及未来高维应用方向。

摘要:

从数据中推断转移算子通常被表述为一个依赖于Ulam方法的经典问题。传统描述称为Ulam-Galerkin方法,其做法是将问题投影到由细密矩形网格上支撑的示性函数所表示的基函数上。从这一视角看,Ulam-Galerkin方法可以被解释为使用直方图方法进行密度估计。在本研究中,我们在统计密度估计的框架下重新表述该问题。这一替代视角使得对偏差和方差进行显式且严格的分析成为可能,从而有助于讨论均方误差。通过使用logistic映射和一个Markov映射的综合示例,我们证明了该方法在估计Frobenius-Perron算子特征向量方面的有效性和可靠性。我们比较了直方图密度估计(Histogram Density Estimation, HDE)和核密度估计(Kernel Density Estimation, KDE)方法的性能,发现KDE在准确性方面通常优于HDE。然而,需要指出的是,KDE在边界点和跳跃点附近表现出局限性。基于我们的研究发现,我们提出将其他密度估计方法引入该领域的可能性,并建议未来研究将基于KDE的估计应用于高维映射。这些发现为从事Frobenius-Perron算子估计的研究人员和实践者提供了有价值的见解,并凸显了密度估计技术在该研究领域的潜力。

英文摘要:

Inference of transfer operators from data is often formulated as a classical problem that hinges on the Ulam method. The conventional description, known as the Ulam-Galerkin method, involves projecting onto basis functions represented as characteristic functions supported over a fine grid of rectangles. From this perspective, the Ulam-Galerkin approach can be interpreted as density estimation using the histogram method. In this study, we recast the problem within the framework of statistical density estimation. This alternative perspective allows for an explicit and rigorous analysis of bias and variance, thereby facilitating a discussion on the mean square error. Through comprehensive examples utilizing the logistic map and a Markov map, we demonstrate the validity and effectiveness of this approach in estimating the eigenvectors of the Frobenius-Perron operator. We compare the performance of Histogram Density Estimation(HDE) and Kernel Density Estimation(KDE) methods and find that KDE generally outperforms HDE in terms of accuracy. However, it is important to note that KDE exhibits limitations around boundary points and jumps. Based on our research findings, we suggest the possibility of incorporating other density estimation methods into this field and propose future investigations into the application of KDE-based estimation for high-dimensional maps. These findings provide valuable insights for researchers and practitioners working on estimating the Frobenius-Perron operator and highlight the potential of density estimation techniques in this area of study. Keywords: Transfer Operators; Frobenius-Perron operator; probability density estimation; Ulam-Galerkin method; Kernel Density Estimation; Histogram Density Estimation.

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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