fixed bug: rand() for batches of images

AlexeyAB

2017-01-10 b831db5e58ad37c8f4adf39de7fb5db204209a1c

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classes= 80
train  = /home/pjreddie/data/coco/trainvalno5k.txt
valid  = coco_testdev
#valid = data/coco_val_5k.list
names = data/coco.names
backup = /home/pjreddie/backup/
eval=coco