Integrate offset into grid

[glenn-jocher]

Eliminate 1 op during training and inference.

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improved bounding box predictions in YOLOv5 🔍.

📊 Key Changes

• Corrected the equation used to calculate the x and y coordinates of bounding boxes.
• Introduced a grid offset of -0.5 when calculating grid values for positioning.

🎯 Purpose & Impact

• 🎯 Purpose: These modifications ensure more accurate and reliable bounding box outputs from the model by refining the coordinate calculations.
• 🌐 Impact: Users of the YOLOv5 model will experience better object detection performance with potentially higher precision in localizing objects.