Fix bark after #41445

[ydshieh]

What does this PR do?

Some Bark model classes are not GenerationMixin and have their own generation method.

#41445 makes change to GenerationMixin and those changes are not applied to those Bark model classes, then causes the bark tests to fail. One example is

tests/models/bark/test_modeling_bark.py::BarkModelIntegrationTests::test_generate_batching

This PR adds GenerationMixin to those models and the tests pass now.

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[ydshieh]

I didn't change class BarkFineModel(BarkPreTrainedModel): however. Too many tests fail when I enable it.

[ArthurZucker]

its good that it fixes is, tho a bit weird as the bark model is not semantically a gernerate model. IDT that's the best solution 👀

[ydshieh]

bark model is not semantically a gernerate model

I agree, but it has a generate method which makes it even confused ...

(and it definitely try to use generation config )

[ydshieh]

As @gante wrote in the codebase,

    def can_generate(cls) -> bool:
        # Bark has a unique model structure, where the external class (`BarkModel`) doesn't need to inherit from
        # `GenerationMixin` (it has a non-standard generation method), but one of the internal models do
        # (`BarkSemanticModel`). This means that the base `can_generate()` will return `False`, but we need to
        # override it so as to do `GenerationConfig` handling in multiple parts of the codebase.
        return True

we see BarkModel is:

• has generate method (although previously not inherits from GenerationMixin)
• set can_generate = True in order to handle GenerationConfig

So after the change #41445, the fix of the failing tests in this PR seems to be natural IMO.

[github-actions]

[For maintainers] Suggested jobs to run (before merge)

run-slow: bark

[ydshieh]

Merged as approved offline on slack