Load image paths and labels from a "frame list". Each line of the frame list contains: `original_vido_id video_id frame_id path labels` Args: frame_list_file (string): path to the frame list. prefix (str): the prefix for the path. return_list (bool): if True,
(frame_list_file, prefix="", return_list=False)
source not stored for this graph (policy: none)