prepare cocodatasets - preprocessing code example

Example: load training data python from coco

Metadata(evaluator_type='coco', image_root='./data/images', json_file='./data/trainval.json', name='fruits_nuts',
         thing_classes=['date', 'fig', 'hazelnut'], thing_dataset_id_to_contiguous_id={1: 0, 2: 1, 3: 2})