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

[aur61]

Fixes https://github.com/pytorch/tutorials/issues/2687

Description

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

Checklist

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

[pytorch-bot[bot]]

:link: Helpful Links

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

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:white_check_mark: No Failures

As of commit e2495e56027ec41017ab23943f020a12102b2f42 with merge base 51a3f60672618b1c20bfca9099cc6d9165a76fcd (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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