Complete 'preprocessing' function for bounding boxes

[clementpoiret]

Implement the logic in hackathon/objectdetection.py's preprocessing function to correctly extract and process bounding box coordinates and labels from the input sample. Ensure output is structured for subsequent augmentation steps.

[bernardev254]

I'm a Python and machine learning enthusiast with a strong passion for developing efficient data processing solutions. My approach to implementing the logic in the preprocessing function involves extracting bounding box coordinates and labels from the input sample, normalizing these coordinates for consistency, and structuring the output to ensure compatibility with subsequent augmentation steps. I focus on writing clean, maintainable code and leveraging my experience with libraries such as TensorFlow and JAX to optimize performance. I'm excited to contribute to this project and ensure the preprocessing function meets the required standards for accuracy and efficiency.