Add optional transforms argument to LoadStreams()

[glenn-jocher]

Prepare for streaming classification support

Signed-off-by: Glenn Jocher glenn.jocher@ultralytics.com

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Simplified webcam and stream processing in YOLOv5 data loading code.

📊 Key Changes

• 🔍 Improved naming consistency (renamed img to im to match the rest of the codebase).
• 🔧 Removed unnecessary variable assignments for conciseness.
• 💼 Centralized image transformation and letterboxing logic for frames from videos and webcams.
• 🔄 Standardized image converting procedure (BGR to RGB, HWC to CHW).
• ✨ Added an optional transforms parameter to the stream loader to enable custom transformations.
• 🧹 Code cleanup for better readability and maintenance.

🎯 Purpose & Impact

• 🚀 Streamlines the data loading process for better performance and ease of further modifications.
• 💡 Makes the code more accessible for developers due to consistent naming and reduced complexity.
• 📈 Enhances flexibility with transform customizations, potentially improving the effectiveness of different use cases.
• 🔍 The potential increase in efficiency can benefit real-time applications relying on webcam and stream data, leading to smoother end-user experiences.