Learning Gaussian Process Kernels via Hierarchical Bayes

Learning Gaussian Process Kernels via Hierarchical Bayes
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发表时间:
2004-12
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通讯作者:
A. Schwaighofer;Volker Tresp;Kai Yu
A. Schwaighofer;Volker Tresp;Kai Yu
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作者:
A. Schwaighofer;Volker Tresp;Kai Yu

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我们提出了一种新的方法,学习高斯过程回归的分层贝叶斯框架。在第一步骤中,使用简单且有效的EM算法从数据学习固定输入点集合上的核矩阵。这个步骤是非参数的,因为它不需要协方差函数的参数形式。在第二步中,使用广义Nystrom方法拟合核函数以近似学习的协方差矩阵,这导致复杂的数据驱动核。我们评估我们的方法作为艺术图像的推荐引擎,其中提出的分层贝叶斯方法导致出色的预测性能。
We present a novel method for learning with Gaussian process regression in a hierarchical Bayesian framework. In a first step, kernel matrices on a fixed set of input points are learned from data using a simple and efficient EM algorithm. This step is nonparametric, in that it does not require a parametric form of covariance function. In a second step, kernel functions are fitted to approximate the learned covariance matrix using a generalized Nystrom method, which results in a complex, data driven kernel. We evaluate our approach as a recommendation engine for art images, where the proposed hierarchical Bayesian method leads to excellent prediction performance.