[WIP] Implement Proposals.HSlice

[SaranjeetKaur]

[codecov[bot]]

Codecov Report

Merging #45 into master will decrease coverage by 0.19%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
- Coverage   88.23%   88.03%   -0.20%     
==========================================
  Files           9        9              
  Lines         442      443       +1     
==========================================
  Hits          390      390              
- Misses         52       53       +1     

Flag	Coverage Δ
#unittests	88.03% <ø> (-0.20%)	:arrow_down:

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Impacted Files	Coverage Δ
src/proposals/Proposals.jl	93.75% <ø> (ø)
src/bounds/Bounds.jl	80.00% <0.00%> (-3.34%)	:arrow_down:

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[cpfiffer]

Also, all the tests are failing. Definitely a good idea to fix those before we can make any meaningful comments.

[mileslucas]

Also, this is a general question for this repo, how is the actual accuracy of these proposals being tested? Like if I give it a simple model, does it get the mean/variance right?

Right now I'm testing some trivial properties of the proposals, such as "does the proposed point have higher likelihood than the critical value?" Implicitly it also makes sure we don't hit any of those errors related to extremely inefficient sampling (this is all in test/proposals.jl). In addition, they're being used inside the sampling integration tests, which do have analytical outputs we can test against (this is in test/sampling.jl).

Looking at other nested sampling libraries this actually seems like more coverage already. For example, dynesty's tests are almost all integration tests that don't even test all combos of proposals and bounds.

I'd love to get some more granularity to be able to test the corner cases and expectations of the proposals, but this work isn't directly part of my current research so I can't commit as much time to this package to polish off the corners.