Handle unconstrained priors in randomize_hyperparameters #796
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Related issue(s)/PRs: #793
Summary
Fix randomize_hyperparameters to handle unconstrained priors.
Also change the logic for handling Sigmoid constraints: we now prioritise sampling from the prior if there is one, and sample from the constrained domain only if there isn't.
Fully backwards compatible: no
New Sigmoid behaviour is more logical and flexible, and old behaviour can be easily obtained by removing any prior.
PR checklist