Restrict sampler to only draw from the prior for a particular variable

Questions v5
3

Oh no, I had two notebooks open last night and was looking at the wrong one when making some of those edits.

For anyone else who finds this, I did have to make a change to the step sampler. The astep function should be implemented as follows:

    	def astep(self, q0: RaveledVars) -> RaveledVars:
        	point_Amap_info = q0.point_map_info
        	q0 = q0.data
        	q = self.proposal_dist(size=self.ndim)

        	return RaveledVars(q, point_map_info), []

So it should return a tuple of the RaveledVars and an empty list. The list is expected by the parent class ArrayStep and should contain a dictionary of “stats” related to the step (for example related to tuning). Here, we don’t have anything that we want to keep track of, so it’s left empty