Cleaning & commenting #2 - updating comments & docstrings

Edmond Yoo

2018-10-13 c59db54775606349f6ba5c6cab7fcb34498bb31d

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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/