Understanding Probabilistic Sparse Gaussian Process Approximations
Understanding Probabilistic Sparse Gaussian Process Approximations
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发表时间:
2016-06
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通讯作者:
M. Bauer;Mark van der Wilk;C. Rasmussen
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作者:
M. Bauer;Mark van der Wilk;C. Rasmussen
Good sparse approximations are essential for practical inference in Gaussian Processes as the computational cost of exact methods is prohibitive for large datasets. The Fully Independent Training Conditional (FITC) and the Variational Free Energy (VFE) approximations are two recent popular methods. Despite superficial similarities, these approximations have surprisingly different theoretical properties and behave differently in practice. We thoroughly investigate the two methods for regression both analytically and through illustrative examples, and draw conclusions to guide practical application.