Amoradzadeh/cp implicit filter

[moradza]

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What does this PR do ?

Reduce memory consumption of mixer kernels in context parallel setup.

Collection: [Note which collection this PR will affect]

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[jstjohn]

should this be and context_parallel_group.size() > 1:?

[moradza]

I see your point, if _hyena_use_cp set to False, this can be None. Slightly confusing code, b/c it sets cp_group to None.

[moradza]

@jstjohn You can test locally CP == 1 and CP == 2 with this command.
torchrun --nproc_per_node=2 tests/collections/llm/gpt/model/test_hyena_mixer_cp.py --operator_type hyena [--use_subquadratic_ops]

[pzelasko]

Closing this PR as "won't merge".
The following collections have been moved to separate repos in https://github.com/NVIDIA-NeMo organization: avlm, llm, multimodal, multimodal-autoregressive, vlm, speechlm, diffusion.
If you still wish to proceed with this contribution, please re-open it in the relevant repo.