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arXiv 2009.04142stat.MLcs.LGmath.DSphysics.comp-ph
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具有未知观测函数的动力系统的核参数估计

Kernel-based parameter estimation of dynamical systems with unknown observation functions

Yale University(耶鲁大学);Columbia University(哥伦比亚大学);UC San Diego(加州大学圣地亚哥分校);Technion - Israel Institute of Technology(以色列理工学院)

Ofir Lindenbaum, Amir Sagiv, Gal Mishne, Ronen Talmon

摘要:

在实验中,低维动力系统被观察为高维信号;例如,混沌混沌系统的视频。假设我们知道一些未知参数的动力学模型,我们可以通过测量其时间演化来估计潜在系统的参数吗?用于执行该估计的关键信息在于信号和模型之间的时间相互依赖性。我们提出了一个基于内核的分数来比较这些依赖关系。我们的分数推广了线性模型的极大似然估计到未知特征空间中的一般非线性设置。我们估计系统的基本参数最大化建议的分数。我们使用两个混沌动力系统-双摆和Lorenz '63模型证明了该方法的准确性和效率。

英文摘要:

A low-dimensional dynamical system is observed in an experiment as a high-dimensional signal; for example, a video of a chaotic pendulums system. Assuming that we know the dynamical model up to some unknown parameters, can we estimate the underlying system's parameters by measuring its time-evolution only once? The key information for performing this estimation lies in the temporal inter-dependencies between the signal and the model. We propose a kernel-based score to compare these dependencies. Our score generalizes a maximum likelihood estimator for a linear model to a general nonlinear setting in an unknown feature space. We estimate the system's underlying parameters by maximizing the proposed score. We demonstrate the accuracy and efficiency of the method using two chaotic dynamical systems - the double pendulum and the Lorenz '63 model.

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