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arXiv 2108.04715math.STstat.MEstat.TH
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高斯过程回归模型协方差核的可辨识性

Identifiability of Covariance Kernels in the Gaussian Process Regression Model

Jaehoan Kim, Jaeyong Lee

摘要:

高斯过程回归(GPR)模型是一种流行的非参数回归模型。在探地雷达中,回归函数的特征,如不同程度的平滑性和周期性,通过组合各种协方差核来建模,这些协方差核被认为是对某些效应的建模。协方差核具有通过EM算法或马尔可夫链蒙特卡罗估计的未知参数。估计的参数是推断回归函数特征的关键,但这些参数的可辨识性尚未得到研究。本文证明了两种径向基混合核探地雷达和径向基与周期混合核探地雷达中协方差核参数的可辨识性。我们还提供了一些例子,在这种混合内核GPR的不可识别的情况下。

英文摘要:

Gaussian process regression (GPR) model is a popular nonparametric regression model. In GPR, features of the regression function such as varying degrees of smoothness and periodicities are modeled through combining various covarinace kernels, which are supposed to model certain effects. The covariance kernels have unknown parameters which are estimated by the EM-algorithm or Markov Chain Monte Carlo. The estimated parameters are keys to the inference of the features of the regression functions, but identifiability of these parameters has not been investigated. In this paper, we prove identifiability of covariance kernel parameters in two radial basis mixed kernel GPR and radial basis and periodic mixed kernel GPR. We also provide some examples about non-identifiable cases in such mixed kernel GPRs.

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