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arXiv 2012.07269stat.MLcs.LG
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变分状态与参数估计

Variational State and Parameter Estimation

University of Newcastle(纽卡斯尔大学);Uppsala University(乌普萨拉大学)

Jarrad Courts, Johannes Hendriks, Adrian Wills, Thomas Schön, Brett Ninness

摘要:

本文研究了非线性状态空间模型的状态和模型参数的贝叶斯估计问题。一般来说,这个问题没有一个易于处理的解决方案,必须使用近似。在这项工作中,变分的方法是用来提供一个假设的密度近似所需的,棘手的,分布。该方法是确定性的,结果在一个标准形式的优化问题。由于假设密度的参数化,选择的一阶和二阶导数是现成的,这允许有效的解决方案。所提出的方法进行了比较,对国家的最先进的哈密顿蒙特卡罗在两个数值例子。

英文摘要:

This paper considers the problem of computing Bayesian estimates of both states and model parameters for nonlinear state-space models. Generally, this problem does not have a tractable solution and approximations must be utilised. In this work, a variational approach is used to provide an assumed density which approximates the desired, intractable, distribution. The approach is deterministic and results in an optimisation problem of a standard form. Due to the parametrisation of the assumed density selected first- and second-order derivatives are readily available which allows for efficient solutions. The proposed method is compared against state-of-the-art Hamiltonian Monte Carlo in two numerical examples.

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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