Ability to download older assets

[CristiFati]

Sometimes, one would need to download the assets for a previously released version. Instead of doing it manually (either from browser, either changing the URL), it's possible to make use of attempt_download's newly added parameter (and a small change in data/scripts/download_weights.sh):

The release can be specified in 2 ways:

• attempt_download(..., release='v5.0')

• attempt_download(..., release='tags/v5.0')

Of course, current existing behavior is the default.

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhanced attempt_download function to support specific GitHub release assets.

📊 Key Changes

• attempt_download now accepts an additional release parameter to specify the GitHub release version.
• Default behavior targets the latest release if no other is specified.
• Constructed the URL to fetch from GitHub API now includes the specified release.
• Added a check to prepend "tags/" to the release string if it is not the latest and does not already start with "tags/".

🎯 Purpose & Impact

• Users can now download model weights or other assets from a specific release, providing greater control over the version of files used.
• Enhances reproducibility and flexibility for developers and researchers who need specific versions of code or data.
• Reduces potential issues from always pulling the latest version which might not be compatible with certain codebases or project requirements.

[glenn-jocher]

@CristiFati PR is merged. Thank you for your contributions to YOLOv5 🚀 and Vision AI ⭐