subtopic

YOLO folder structure, label format and data.yaml

Learn the exact format YOLO needs: images/train, images/val, images/test and matching labels/train, labels/val, labels/test. Each image has a .txt file with the same name; each line is one box: class_id x_center y_center width height, all divided by the image width/height (values 0–1). Background images get an empty .txt. A data.yaml file lists the folders and class names.