Revive GPU tests

[ErikQQY]

Fix: #429

Instead of completely removing the current ReTest.jl test suite, this PR moves the GPU tests to another test environment so that we can only use Test.

[ErikQQY]

It occurs to me that while we no longer throw warning messages for numerical errors, we can safely use ReTest.jl for GPU tests as well?

AdvancedHMC.jl/test/hamiltonian.jl

Lines 34 to 36 in 7067a90

	# (HongGe) we no longer throw warning messages for numerical errors.
	# @test_logs (:warn, "The current proposal will be rejected due to numerical error(s).") init_z1()
	# @test_logs (:warn, "The current proposal will be rejected due to numerical error(s).") init_z2()

[yebai]

@sunxd3, can you review this PR and help set up buildkite for this repo?

[sunxd3]

The changes looks sensible.

I messaged Tim who manages JuliaGPU on slack and I'll update when he returns.

In the meantime, I don't know AHMC code in close detail. I remember ReTest's purpose is to allow writing tests in source files. Are we using this pattern in AHMC? If not, are there other reasons we would still need ReTest?

[ErikQQY]

ReTest.jl is introduced in #287 with the intention of allowing a subset of testing and providing a better summary of test results, see https://github.com/TuringLang/AdvancedHMC.jl/blob/main/test/README.md

[sunxd3]

Got it, thanks.

I wonder if we can use Pkg.test directly now, it also takes a test_args argument. (I am not sure if this was not true back then, or ReTest simply has a better interface.)

[ErikQQY]

I wonder if we can use Pkg.test directly now, it also takes a test_args argument.

I may not quite understand here, we can directly call Pkg.test() to test the package. And while the CUDA tests are no longer affected by ReTest.jl, I don't think it really matters if we are using Test or ReTest.

[sunxd3]

You are right -- this current PR is not discussing the use of ReTest 👍

[yebai]

I'm merging this now since we need the Buildkite script to be on main to be activated

[sunxd3]

The GPU pipeline should be set up https://buildkite.com/julialang/advancedhmc-dot-jl