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Any support for hyperparameter selection? That's otherwise a bit of a black art. I skimmed the documentation but didn't see it mentioned.

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Not currently. We are looking to introduce easy interfacing with Spearmint, a library which does bayesian hyperparameter search. This should be part of the v1 release.

Have you taken a look at this ? https://github.com/HIPS/autograd and paper http://arxiv.org/pdf/1502.03492.pdf

They reverse the computation of the gradient to calculate the derivative wrt the hyper parameters.

You also might want to check out Whetlab: https://www.whetlab.com/.

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