Update HSGP with changes from PyMC #7342

[bwengals]

• Update usage of pm.gp.hsgp_approx.approx_hsgp_hyperparams
• Replace Xs input with X on .prior_linearized
• Add reference to Stan prior rec's for student-t degrees of freedom
• Tweak priors on example 2 for better results

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📚 Documentation preview 📚: https://pymc-examples--665.org.readthedocs.build/en/665/

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AlexAndorra commented on 2024-06-02T16:17:04Z ----------------------------------------------------------------

Line #12.    X_center = (np.max(X, axis=0) - np.min(X, axis=0)) / 2.0

IIUC, this is computing the radius, not the mid point. For the latter, I think, we need to change the formula to:

X_center = (np.max(X, axis=0) + np.min(X, axis=0)) / 2

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