Fix the unpack error and add code for transferring data to the GPU

[aurada]

Fixes #2687

Description

1. Fixed the unpack error
2. Add code for transferring data to the GPU

Checklist

• The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• Only one issue is addressed in this pull request
• Labels from the issue that this PR is fixing are added to this pull request
• No unnecessary issues are included into this pull request.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/2688

• 📄 Preview Python docs built from this PR

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✅ No Failures

As of commit e2495e5 with merge base 51a3f60 ():
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