[BugFix] Added a missing .to(device) call in _from_transformers_generate_history

[michalgregor]

Description

I added the missing .to(device) call to TransformersWrapper's _from_transformers_generate_history.

Motivation and Context

It seems that TransformersWrapper's _from_transformers_generate_history misses a .to(device) call after it performs history.apply_chat_template, i.e. the resulting token tensor is not on the correct device and an exception gets raised later in the result = self._generate_from_tokens( call.

Types of changes

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• [ X ] Bug fix (non-breaking change which fixes an issue)

Checklist

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• [ X ] I have read the CONTRIBUTION guide (required)

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/3289

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[vmoens]

Hello @michalgregor
This looks sound to me, can you sign the CLA? Then happy to merge

[michalgregor]

I took care of the CLA just now; thank you! 🙂

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