Fix missing ultralytics package on torch.hub.load()

[glenn-jocher]

May resolve #11945

🤖 Generated by Copilot at 97bc939

Summary

🗑️📦🛠️

Improved import handling and code style in utils/general.py. Added support for ultralytics package as an optional dependency.

We'll tidy up the code, me hearties, yo ho ho
We'll drop the math and try ultralytics, yo ho ho
We'll check the suffix and the whitespace, yo ho ho
And then we'll push the changes to the repo

Walkthrough

• Add ultralytics package as a dependency and try to import it or install it if not found (link)
• Move import math statement from the top of the file to the try_import function, where it is needed for some math operations (link, link)
• Remove whitespace after comma in suffix parameter of check_suffix function to follow Python style guide (link)

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Automatic ultralytics package check and installation.

📊 Key Changes

• Added a try-except block to models/common.py and utils/general.py.
• These blocks attempt to import the ultralytics package, verifying it's not just a local directory with a version attribute check.
• If the package is missing or the assertion fails, the script automatically runs a pip install command to install or update the ultralytics package.

🎯 Purpose & Impact

• Ensure dependency integrity: Guarantees that the ultralytics package is installed and up-to-date, avoiding errors due to missing or incorrect package versions.
• Simplify installation process: Users don't need to manually install the ultralytics package; it's managed automatically, which streamlines initial setup and updates.
• Potential impact: May improve user experience through reduced setup complexity, but could unexpectedly modify users' environments if they are unaware of the automatic installation process.