[UnitTests][Ethos-N] Mark unit tests as requiring Ethos-N

[Lunderberg]

• Adds the decorator tvm.testing.requires_ethosn

• Marks all tests in tests/python/contrib/test_ethosn as requiring ethosn instead of directly checking ethosn_available(). This way, they show up as skipped rather than passing.

[tkonolige]

Thanks for this @Lunderberg!

[Mousius]

Thanks for this @Lunderberg, I was just curious whether we should have a tvm.testing.contrib ? Personally, I would rather have it as it is here, and it's an improvement either way 😸

[leandron]

In general LGTM. I remembered we have another test that can be marked with this new decorator, in tvmc.

See here: https://github.com/Lunderberg/tvm/blob/0b7319d6708df5b4ee7cf468a5214cb735107dfb/tests/python/driver/tvmc/test_compiler.py#L293-L297

[Lunderberg]

@Mousius: Thanks for this @Lunderberg, I was just curious whether we should have a tvm.testing.contrib ? Personally, I would rather have it as it is here, and it's an improvement either way smile_cat

I think I'd lean toward having it here. If some of the tools in contrib require a lot of testing functionality, then I think it would make sense to break it out, but so far it's only been single functions here and there.

@leandron: In general LGTM. I remembered we have another test that can be marked with this new decorator, in tvmc.

Thank you for pointing that out, and I've updated it as well. A quick grep doesn't show any other folders that reference ethosn, so we should be set there.

[leandron]

LGTM, just need to solve the conflicts, and get it past CI.

[Lunderberg]

Sounds good, and merge conflicts are now resolved.