CUDAAccelerator.setup_device: fix unrelated device init by matmul precision check

[bm371613]

Without this fix, CUDAAccelerator.setup_device may initialize an unrelated device, via

• _check_cuda_matmul_precision
• _is_ampere_or_later
• torch.cuda.get_device_capability
• torch.cuda.get_device_properties
• torch.cuda._lazy_init

What does this PR do?

Fixes #21725

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[justusschock]

Great! Is there a way for us to test this?

[bm371613]

Great! Is there a way for us to test this?

If you mean unit tests, I can see a simple test monkeypatching torch.cuda and checking that set_device is called before _lazy_init. If you don't mind digging into torch.cuda internals for testing.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87%. Comparing base (1120456) to head (239e437).
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Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21726   +/-   ##
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  Coverage      87%      87%           
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  Files         270      270           
  Lines       23975    23975           
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  Hits        20750    20750           
  Misses       3225     3225           

[justusschock]

If you mean unit tests, I can see a simple test monkeypatching torch.cuda and checking that set_device is called before _lazy_init. If you don't mind digging into torch.cuda internals for testing.

As long it is local to the specific test and doesn't have side-effects to other tests, i think that sounds like a good approach