fixed bug: rand() for batches of images

AlexeyAB

2017-01-10 b831db5e58ad37c8f4adf39de7fb5db204209a1c

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classes=1000
train  = /data/imagenet/imagenet1k.train.list
valid  = /data/imagenet/imagenet1k.valid.list
backup = /home/pjreddie/backup/
labels = data/imagenet.labels.list
names  = data/imagenet.shortnames.list
top=5