Update Readme.md - How to train with multi-GPU

Alexey

2016-12-13 94641733ce521e5a44f3c9414f9797b77b34a31e

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classes= 20
train  = /home/pjreddie/data/voc/train.txt
valid  = /home/pjreddie/data/voc/2007_test.txt
names = data/voc.names
backup = /home/pjreddie/backup/