feat: add ignored_params support for fsdp2

[kmehant]

What does this PR do?

This allows reusing ignored_modules user facing FSDP API for FSDP v2 to set ignored_params.

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@SunMarc @zach-huggingface @S1ro1

[S1ro1]

Hello, thank you for the PR. Can you also include it in the tests?

[kmehant]

Hi 👋🏻 @S1ro1

Yes I will update the PR with the test.

[kmehant]

@S1ro1 Have added it.

[kmehant]

@S1ro1 Should I bump up the torch version FSDP2_PYTORCH_VERSION to 2.7.0 from 2.6.0? Since ignored_params is available from 2.7.0? Or you want me to handle it separately?

[kmehant]

@S1ro1 appreciate any update ?

[S1ro1]

@kmehant Sorry, missed the update. I think it should be handled separately, something in post_init of fsdp plugin, along the lines of if version < 2.7.0 and ignored_params not None and fsdp_version == 2

[kmehant]

@S1ro1 thank you for the response, does the current change sound good? Also, do you think we should expose ignored_params as an option for the user to provide apart from having ignored_modules as a proxy?

[S1ro1]

LGTM

[S1ro1]

@kmehant I think let's see if this gets some usage, can you think of some common use-cases where you'd like to use ignored_params directly? I feel like ignored_params/modules aren't that commonly used anyway.

[HuggingFaceDocBuilderDev]

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[kmehant]

@S1ro1

I think let's see if this gets some usage, can you think of some common use-cases where you'd like to use ignored_params directly?

I don't have a usecase for ignored_params we can keep it for future.

I feel like ignored_params/modules aren't that commonly used anyway.

We have a specific use case for this, this PR will be helpful.

[kmehant]

Failed test seems unrelated