repair tabs spaces

Tino Hager

2018-06-27 170cebf8af215f8d7c20cbbe4e19a9356f235b60

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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/