[trainer] [deepspeed] refactor deepspeed setup devices #9880
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Following the discussion at #9798 (review) as we now have multiple integrations with complex unique setups, @sgugger and I agreed that it's better to have a small duplication of a few lines of code but to make it much easier to understand what goes on for a specific integration, so rather than further refactoring the recently added sage branch, this PR creates a dedicated branch for DeepSpeed and thus simplifies the general case when straight DDP is used.
There is no functionality change - just a small code reshuffle.
@sgugger