Added F1 score to accuracy statistic

AlexeyAB

2018-03-01 be9ccb7d7f4135a41910e6401fbe0c604f1a4080

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