fix detection paths

Philip Kahn

2018-05-04 1aadf29a51fcc985f46cee4f9c7bc23c44507834

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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/