mkdir COCO
cd COCO

wget http://images.cocodataset.org/zips/train2017.zip
wget http://images.cocodataset.org/zips/val2017.zip
wget http://images.cocodataset.org/annotations/annotations_trainval2017.zip
wget http://images.cocodataset.org/zips/test2017.zip
wget http://images.cocodataset.org/annotations/image_info_test2017.zip 

unzip train2017.zip
unzip val2017.zip
unzip annotations_trainval2017.zip
unzip test2017.zip
unzip image_info_test2017.zip

# rm -f train2017.zip
# rm -f val2017.zip
# rm -f annotations_trainval2017.zip
# rm -f test2017.zip
# rm -f image_info_test2017.zip