FIX Convergence Warnings in Gaussian process examples (#18019)
FIX Convergence Warnings in Gaussian process examples (#18019)

Co-authored-by: Maren Westermann <2764d0ad945b02c38510f10bbe79b4d26e816d85@free-now.com>
Co-authored-by: Thomas J. Fan <5e8796a332fafc9c261437cd1787ae2709a896a7@gmail.com>
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