Bayesian Optimization by 2023
Author:2023
Language: eng
Format: epub
Chapter 4 Gaussian proCess reGression with GpytorCh
Figure 4-2. Visualizing the initial ten noisy observations
Before fitting a GP model, we must define the mean and covariance (kernel) functions for the prior GP. There are multiple mean functions available in GPyTorch, including the zero mean function gpytorch.means.ZeroMean(), the constant mean function gpytorch.means.
ConstantMean(), and the linear mean function gpytorch.means.LinearMean(). In this case, we use the constant mean function, assuming that there is no systematic trend in the data.
As for the kernel function, we choose one of the most widely used kernels: the RBF
x x 2
kernel, or the squared exponential kernel k x x
1
2
, exp
, where l is the
1
2
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