[Checkpoint][2D][4/N] Add nested_dict for distributed checkpoint to core distributed #89537
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…ore distributed (pytorch#89537) This PR moves nested_dict and its test to torch.distributed.checkpoint. This is a pre-req for enabling 2D checkpoint. This provides the functionality to flatten a nested dict and unflatten a flattened dict. Docstring will be added in the following PR. Pull Request resolved: pytorch#89537 Approved by: https://github.com/fduwjj, https://github.com/wanchaol
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This PR moves nested_dict and its test to torch.distributed.checkpoint. This is a pre-req for enabling 2D checkpoint.
This provides the functionality to flatten a nested dict and unflatten a flattened dict.
Docstring will be added in the following PR.