Enable NamedTuple data type to work with DDP (#44220)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/44220
Closes https://github.com/pytorch/pytorch/issues/44009
Currently if a dataloader returns objects created with a
collections.namedtuple, this will incorrectly be cast to a tuple. As a result, if we have data of these types, there can be runtime errors during the forward pass if the module is expecting a named tuple.
Fix this in
`scatter_gather.py` to resolve the issue reported in
https://github.com/pytorch/pytorch/issues/44009
ghstack-source-id: 113423287
Test Plan: CI
Reviewed By: colesbury
Differential Revision: D23536752
fbshipit-source-id: 3838e60162f29ebe424e83e474c4350ae838180b
