[gradient_checkpointing] default to use it for torch 2.3

[ArthurZucker]

What does this PR do?

Fixes #28536 in preparation for next torch release

[younesbelkada]

Makes sense!

[hiyouga]

Why do we use reentrant gc by default? It said the non-reentrant gc can be more advantageous than the reentrant version: https://pytorch.org/docs/2.0/checkpoint.html#torch.utils.checkpoint.checkpoint

[younesbelkada]

@hiyouga the use_reentrant=True is used by default in PT anyway so if you set it to None, use_reentrant will be set to True

[github-actions]

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[HuggingFaceDocBuilderDev]

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[lucasjinreal]

I upgrade transformers to latest, still got this warning, and this warning is logged every single step

s/env-3.9.2/lib/python3.9/site-packages/torch/utils/checkpoint.py:460: UserWarning: torch.utils.checkpoint: please pass in use_reentrant=True or use_reentrant=False explicitly. The default value of use_reentrant will be updated to be False in the future. To maintain current behavior, pass use_reentrant=True. It is recommended that you use use_reentrant=False. Refer to docs for more details on the differences between the two variants.
  warnings.warn(
/data/miniconda3/envs/env-3.9.2/lib/python3.9/site-packages/torch/utils/checkpoint.py:90: UserWarning: None of the inputs have requires_grad=True. Gradients will be None
  warnings.warn(
/data/miniconda3/envs/env-3.9.2/lib/python3.9/site-packages/torch/utils/checkpoint.py:460: UserWarning: torch.utils.checkpoint: please pass in use_reentrant=True or use_reentrant=False explicitly. The default value of use_reentrant will be updated to be False in the future. To maintain current behavior, pass use_reentrant=True. It is recommended that you use use_reentrant=False. Refer to docs for more details on the differences between the two variants.
  warnings.warn(
/data/miniconda3/envs/env-3.9.2/lib/python3.9/site-packages/torch/utils/checkpoint.py:90: UserWarning: None of the inputs have requires_grad=True. Gradients will be None
  warnings.warn(
/data/miniconda3/envs/env-3.9.2/lib/python3.9/site-packages/torch/utils/checkpoint.py:460: UserWarning: torch.utils.checkpoint: please pass in use_reentrant=True or use_reentrant=False explicitly. The default value of use_reentrant will be updated to be False in the future. To maintain current behavior, pass use_reentrant=True. It is recommended that you use use_reentrant=False. Refer to docs for more details on the differences between the two variants.
  warnings.warn(
/data/miniconda3/envs/env-3.9.2/lib/python3.9/site-packages/torch/utils/checkpoint.py:90: UserWarning: None of the inputs have requires_grad=True. Gradients will be None
  warnings.warn(

how to disable it?

[ArthurZucker]

Can you open a new issue with a proper reproducer ?