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Improve hyperparameters theta bounds handling #272

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Improve hyperparameters theta bounds handling #272

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@relf relf commented Jun 4, 2025

This PR is related to hyperparameters (theta) handling, it contains:

  • Python bindings: Allow to not optimize hyperparameters via n_start being set to a negative number
  • theta for squared exponential kernel is equivalent to the lenghtscale l inverse (was 1/(2*l^2) before) as for the other kernels
  • bounds of theta now depend on dimension and kernel used (cf. paper, p9)

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