Run CI against new DPPL / VNT

[penelopeysm]

The usual game of trying to see if DPPL breaks anything upstream.

(20 minutes later)

Okay, maybe 'if DPPL breaks anything upstream' was a bit optimistic. More like seeing what DPPL broke upstream.

[penelopeysm]

Ok, MH is totally borked. I refrain from using a stronger word. It basically needs to be rewritten. I'd say though, that InitContext actually gives us a really good way of doing this.

[github-actions]

Turing.jl documentation for PR #2756 is available at:
https://TuringLang.github.io/Turing.jl/previews/PR2756/

[codecov]

Codecov Report

❌ Patch coverage is 43.81443% with 109 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.12%. Comparing base (2eb47a0) to head (3718d77).

Files with missing lines	Patch %	Lines
src/mcmc/mh.jl	38.20%	55 Missing ⚠️
src/mcmc/gibbs_conditional.jl	0.00%	20 Missing ⚠️
src/mcmc/abstractmcmc.jl	7.14%	13 Missing ⚠️
src/mcmc/gibbs.jl	62.06%	11 Missing ⚠️
src/mcmc/particle_mcmc.jl	50.00%	2 Missing ⚠️
src/optimisation/Optimisation.jl	0.00%	2 Missing ⚠️
src/optimisation/init.jl	60.00%	2 Missing ⚠️
src/variational/Variational.jl	0.00%	2 Missing ⚠️
src/mcmc/ess.jl	95.23%	1 Missing ⚠️
src/mcmc/external_sampler.jl	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (2eb47a0) and HEAD (3718d77). Click for more details.

HEAD has 16 uploads less than BASE

Flag	BASE (2eb47a0)	HEAD (3718d77)
	24	8

Additional details and impacted files

@@              Coverage Diff              @@
##           breaking    #2756       +/-   ##
=============================================
- Coverage     85.31%   43.12%   -42.20%     
=============================================
  Files            23       22        -1     
  Lines          1430     1389       -41     
=============================================
- Hits           1220      599      -621     
- Misses          210      790      +580     

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