Fix batch size calculation in dist_tuto

[petergtz]

Description

Batch size (bsz) must be an int, not a float. This change fixes it, basically doing the same as in https://github.com/seba-1511/dist_tuto.pth/blob/a552567061a9985cdcfe72ecb9b47e4630d6a7fe/train_dist.py#L85 (the sample linked from the tutorial).

Checklist

• This is a trivial tutorial fix. I have not created an issue for it.
• 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.

cc @wconstab @osalpekar @H-Huang @kwen2501

[pytorch-bot]

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[wconstab]

thanks for the fix!