Usage of DDP on a module that doesn't require gradients #25552
Description
Per #25550, this raises a terrible error message.
Instead, we can choose to do one of two things:
- Raise a nicer error message to say it's not needed to use DDP.
- Allow this and become a non-functional pass through.
@mrshenli @zhaojuanmao @pritamdamania87 Thoughts?
cc @pietern @mrshenli @pritamdamania87 @zhaojuanmao @satgera