fix the path error in export.py

[miknyko]

Hi, guys

I found a small bug in export.py.

the variable f is a pathlib.Path , which cannot be directly passed in scriptmodel.save

it has to be callled .as_posix() to get a string representation of the path

at least in windows

or there will be an error saying

TorchScript: export failure: save(): incompatible function arguments. The following argument types are supported: 1. (self: torch._C.ScriptModule, filename: str, _extra_files: Dict[str, str] = {}) -> None

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

This PR appears to be a placeholder or an error since there are no code changes.

📊 Key Changes

• None, as the PR contains zero code changes.

🎯 Purpose & Impact

• No impact on users or the codebase as no modifications were made.

[github-actions]

👋 Hello @miknyko, thank you for submitting a 🚀 PR! To allow your work to be integrated as seamlessly as possible, we advise you to:

• ✅ Verify your PR is up-to-date with upstream/master. If your PR is behind upstream/master an automatic GitHub actions rebase may be attempted by including the /rebase command in a comment body, or by running the following code, replacing 'feature' with the name of your local branch:

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[glenn-jocher]

@miknyko export works correctly, it is verified in our CI checks every 24 hours and on every commit:
https://github.com/ultralytics/yolov5/actions/runs/1501652617

If you find a reproducible bug please submit a bug report, thank you!

[glenn-jocher]

[miknyko]

I am using torch 1.7.1, and i afraid that in pytorch1.7 there is still no support for pathlib.windowsPurepath

[miknyko]

and by the way im using python3.8

[glenn-jocher]

@miknyko ah ok got it. Can you submit a PR to use a str() wrapper then around the Path object?

[miknyko]

No problem