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Is it specified anywhere what the backend is for the Bayesian optimization related functionality in Mathematica v11? I'm specifically referring to the Bayesian* functions like BayesianMinimization. Are they based on an open-source package like Spearmint, or on a brand new implementation? For example the neural network functionality is based on MXNet, but I couldn't find any information in the docs about the backend that's being used for Bayesian optimization.

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    $\begingroup$ it seems to use the same implementation of Gaussian Processes as is used by the Predict/Classify framework. this suggests it's probably a brand new implementation. $\endgroup$ – Michael Curry Jan 17 '18 at 2:35

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