add `require_triton` and enable `test_dynamo` work on xpu

[faaany]

What does this PR do?

test_dynamo works on xpu, but fails because it requires extra installation of the triton library. This PR adds the require_triton test marker and make test_dynamo device-agnostic.

[faaany]

Hmm, I always thought that triton comes with torch. I just created a test env and ran pip install torch and indeed triton was installed. Under what circumstances can it be missing, is it dependent on the device?

yes, it depends on the device. For the pytorch cuda distribution, triton is installed by default. But for XPU and CPU, triton will not be installed by default (at least for now). So if we think about the pro&cons about adding this marker:

Pros:

• larger device coverage
• explicit information for the user that this test case requires triton

Cons:

• more code in the codebase that is not used often (but I am not sure whether we will have more test case that needs pytoch dynamo)

[faaany]

Just let me know how you decide; I will update my code accordingly. Thanks so much for the review! @BenjaminBossan @SunMarc

[BenjaminBossan]

Thanks for providing further information on the triton dependency. In that case, I agree that adding an explicit check is fine.

As to whether we should potentially break the tests for other non-CUDA devices: It's hard to say if this would be a good thing or not, as we don't know how that will affect the corresponding maintainers. Probably it's best for Zach to judge when he's back.

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