fixed bug: rand() for batches of images

AlexeyAB

2017-01-10 b831db5e58ad37c8f4adf39de7fb5db204209a1c

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classes= 20
train  = /home/pjreddie/data/voc/train.txt
valid  = /home/pjreddie/data/voc/2007_test.txt
names = data/voc.names
backup = /home/pjreddie/backup/