GPU Attempt 2

[willtebbutt]

Summary

Supercedes #470 . I messed up some of my gitconfig stuff and had commits with the wrong username etc. Easiest thing was to start again

Proposed changes

• ...

What alternatives have you considered?

Breaking changes

edit:

TODO:

1. sort out codecov on buildkite branch
2. sort out formatting

[codecov[bot]]

Codecov Report

Base: 90.00% // Head: 86.53% // Decreases project coverage by -3.47% :warning:

Coverage data is based on head (12fe669) compared to base (dede8a0). Patch coverage: 18.57% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #472      +/-   ##
==========================================
- Coverage   90.00%   86.53%   -3.48%     
==========================================
  Files          52       53       +1     
  Lines        1351     1478     +127     
==========================================
+ Hits         1216     1279      +63     
- Misses        135      199      +64     

Impacted Files	Coverage Δ
src/KernelFunctions.jl	100.00% <ø> (ø)
src/distances/cuda.jl	0.00% <0.00%> (ø)
src/TestUtils.jl	47.36% <6.55%> (-47.37%)	:arrow_down:
src/basekernels/fbm.jl	96.07% <77.77%> (-3.93%)	:arrow_down:
src/basekernels/exponential.jl	100.00% <100.00%> (ø)
src/basekernels/matern.jl	100.00% <100.00%> (ø)
src/basekernels/wiener.jl	92.85% <100.00%> (ø)
src/transform/scaletransform.jl	100.00% <0.00%> (+13.33%)	:arrow_up:
src/transform/periodic_transform.jl	50.00% <0.00%> (+20.00%)	:arrow_up:
src/transform/transform.jl	100.00% <0.00%> (+40.00%)	:arrow_up:
... and 5 more

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[willtebbutt]

@theogf there are a couple of minor things left to do, but I think this is defintely ready for review

[willtebbutt]

@willtebbutt Do you think it will take some time to sort out all remaining comments and issues in this PR? If so, we could add only the buildkite configuration as a first step to fix CI errors and add GPU-specific tests in a follow-up PR, similar to https://github.com/JuliaGaussianProcesses/AbstractGPs.jl/pull/335.

That would be ideal. I thought I was going to have time to follow up on this immediately, but it's actually going to be a little while. If you could open a PR like the one you made to AbstractGPs, that would be ideal.