ReactiveNestedSampler finishing on the first iteration about ultranest HOT 3 CLOSED

As the debug log will confirm, you have a likelihood plateau, with multiple likelihood points having the same value. To support plateaus within nested sampling, the live points need to be reduced. If all live points have the same value, the problem seems trivially solved (uninformative likelihood, prior=posterior).

I would suggest you modify your likelihood so that you do not return just -1e300, but introduce a slight slope which increases towards the physical space. For example, in the else clause, set log_like = -1e300 * np.abs(val - 0.6)

Even better would be if you defined your prior so that that unphysical space cannot be proposed.

from ultranest.

To your last question, this is independent of the proposal.

from ultranest.

Thank you @JohannesBuchner! I will try both approaches!

from ultranest.