tankertyp

"mkdir /data/coco" and put all downloaded data into it,then "python download_and_convert_data.py",you should see this: ... None Annotations data/coco/train2014/COCO_train2014_000000284128.jpg >> Converting image 2151/82783 shard 0 >> Converting image 2201/82783 shard 0...

grep -Ril "xrange",find it and change it for "range".It is caused by the difference of python2.x and python3.x.