Update DDP documentation to mention outputs not used in loss is supported (#60275)
Summary:
We recently landed a change to ensure that when running under ``find_unused_parameters=True``, not all module outputs have to be used in loss computation and DDP will work as expected. Mention this update in the documentation and add some additional clarification.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/60275
Reviewed By: SciPioneer
Differential Revision: D29502609
Pulled By: rohan-varma
fbshipit-source-id: ddb3129cff9492018e61813413b30711af212309
