Fix device error while calculating loss in `Trainer`
Author: echo-yi
Pull request: yes

# What does this PR do?

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Fixes `ValueError` in `Trainer` when `tr_loss` and `tr_loss_step` are on different devices. This error happens when I use `device_map='auto'` and `ORPOTrainer` together.


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@amyeroberts 

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Comments:
Hi @echo-yi, thanks for opening this PR! 

Based on the warning message in the diff - it seems this is flagging device placement which should be handled elsewhere. cc @muellerzr who might know more 

Hey @echo-yi, I've opened up a PR to fix the issue you are facing. The fix should live in TRL instead. LMK if this solves your issue !