balloon dataset: https://github.com/matterport/Mask_RCNN/releases
$ python balloon.py train --dataset='<add>/balloon' --weights=coco --logs='<add>/weights'
$ python balloon.py splash --weights='<add>/mask_rcnn_balloon_0030.h5' --image='<add>/balloon/val/410488422_5f8991f26e_b.jpg'
