Comment Cython

[glenn-jocher]

Ultralytics REST API fix, check_requirements fails to properly see that Cython is installed.

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Adjustments to library requirements for YOLOv5, enhancing compatibility and calculation features.

📊 Key Changes

• Commented out Cython: Cython is no longer a required dependency, suggesting it's an optional or indirect dependency now.
• Reordered thop: The thop library, which is used for FLOPS (Floating Point Operations Per Second) computation, has been moved in the list but remains a requirement.

🎯 Purpose & Impact

• Enhanced Flexibility: By making Cython an optional requirement, the YOLOv5 setup process may become more flexible, reducing the potential for installation issues related to the Cython package.
• Better Maintainability: Reordering dependencies can sometimes be a part of cleaning up the requirements file for better readability and maintainability.
• Minimal User Impact: These changes are minor and should not significantly impact most end-users, but developers who directly interact with the codebase may appreciate the clarified dependencies.

🔍 Note: For users unfamiliar with these terms, "FLOPS computation" is related to measuring the performance of a model or processing system, where a higher number indicates the system can handle more calculations per second. "COCO mAP" refers to a standard metric used to evaluate object detection models based on the COCO dataset.