r-kanke

I followed the process.sh in README.md to make a bilayer mask annotation and it worked for me. ``` $ python -m detectron2.data.datasets.process_dataset datasets/coco/annotations/instances_train2017.json datasets/coco/train2017 coco_ 2017_train $ mv ann.json datasets/coco/annotations/instances_train2017_bcnet.json...