Fix elapsed time computation from issue #3649

[starpiens]

Fixes #3649

Description

This PR fixes the timing helper used in the torch.compile tutorial by dividing the CUDA event elapsed time by 1000 (ms -> s) instead of 1024.

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.

cc @williamwen42 @msaroufim @anijain2305

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3650

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✅ No Failures

As of commit 5ccd9eb with merge base 86b1c62 ():
💚 Looks good so far! There are no failures yet. 💚

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