Update sys.path.append(str(ROOT))

[glenn-jocher]

🛠️ PR Summary

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🌟 Summary

Improved path management and requirements checking in the YOLOv5 codebase.

📊 Key Changes

• Updated sys.path appending logic to check whether the YOLOv5 root directory is already in sys.path before adding it.
• Modified requirement checks to reference the requirements.txt file using the new ROOT variable across various scripts.
• Removed commented code in utils/__init__.py.
• Standardized ROOT directory usage in multiple files to enhance consistency.

🎯 Purpose & Impact

• Avoids Redundancy: Ensures that the YOLOv5 root directory is not added to sys.path multiple times, preventing potential conflicts or issues from path redundancy.
• Consistent Requirement Checks: Centralizes the check for necessary packages, making code maintenance easier and the setup process more reliable for users.
• Cleaner Codebase: Removes unnecessary code and comments, making the code neater and easier to understand.
• Impact on Users: These changes make the setup process more straightforward and could reduce setup errors for new users. It also simplifies future code updates for developers working on YOLOv5.