Add docstrings to functions and reformat

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improved documentation and function annotations across multiple files in the 'ultralytics/xview-yolov3' project. 📚✨

📊 Key Changes

• Added detailed docstrings explaining the functionality and parameters for functions and class constructors. 📘
• Refined import statements for clarity and updated code structure for consistency. 💼
• Enhanced readability and maintainability by clearly describing the purpose of major blocks of code. 🧐

🎯 Purpose & Impact

• Enhances Code Understanding: The newly added comments and docstrings make it easier for both new contributors and existing team members to grasp the code's functionality swiftly. 🤓
• Improves Maintainability: Clearer code and documentation mean future changes, optimizations, and bug fixes can be implemented more efficiently. 🛠️
• Facilitates Open Source Contributions: With improved documentation, external contributors can now participate more effectively, potentially accelerating feature development and issue resolution. 🌍
• Educational Value: For those learning about object detection models and image processing, the codebase serves as a richer resource. 🎓