!3656 [东北大学][高校贡献][Mindspore][retinanet]-迁移训练模型提交

official/cv/retinanet/README_CN.md

official/cv/retinanet/config/finetune_config.yaml

official/cv/retinanet/data/facemask/train.txt

official/cv/retinanet/data/facemask/val.txt

official/cv/retinanet/eval.py

official/cv/retinanet/quick_start.py

official/cv/retinanet/src/data_split.py

official/cv/retinanet/src/dataset.py

official/cv/retinanet/src/init_params.py

official/cv/retinanet/src/lr_schedule.py

official/cv/retinanet/src/retinanet.py

official/cv/retinanet/train.py