ext_output: flush stdout after printing output

Sam Beran

2018-07-10 5fc1e9a918bfb9229eec90d459dbfb6778ae6906

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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/