Method __init__

(self,
                 img_scale=(640, 640),
                 ratio_range=(0.5, 1.5),
                 flip_ratio=0.5,
                 pad_val=114,
                 max_iters=15,
                 min_bbox_size=5,
                 min_area_ratio=0.2,
                 max_aspect_ratio=20,
                 bbox_clip_border=True,
                 skip_filter=True)