Scope gitpyhon import in check_git_info()

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Refactor of git information retrieval in Ultralytics' codebase.

📊 Key Changes

• GIT global variable in utils/general.py is replaced with a function call to check_git_info(), which dynamically checks git information.
• GIT references within train.py, classify/train.py, and segment/train.py are updated to use GIT_INFO obtained from the new check_git_info() function call.
• The import statement of the git library is now included within the new check_git_info() function.
• Import statements for shutil and git modules are cleaned up from where they are no longer needed.
• The check_git_info() function includes a requirement check for the gitpython package before importing the git library.

🎯 Purpose & Impact

• Increased Maintainability: Wrapping the git information retrieval in a function reduces code duplication and centralizes the update process for git-related code.
• Better Error Handling: By checking for the gitpython requirement within the function, the code reduces potential import errors that could occur when the required package is missing.
• Enhanced Code Clarity: Removing global variables and unused imports declutters the codebase and makes the flow of data more comprehendible.

Overall, users can expect a more robust handling of git-related features with reduced chances of encountering import-related errors. Developers will benefit from a cleaner codebase that is easier to maintain and extend in the future. 🛠️📈