Minor fix - what pip-packages are required for Python scripts

AlexeyAB

2018-05-06 c9b8bdee1886df5f83973d91c3597c28f99a9e0c

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classes= 20
train  = data/train_voc.txt
valid  = data/2007_test.txt
#difficult = data/difficult_2007_test.txt
names = data/voc.names
backup = backup/