Added __float2half_rn() and __half2float()

AlexeyAB

2018-02-22 b2b5756d86670b787dac440020922eeb5e8a1442

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classes= 80
train  = data/coco/trainvalno5k.txt
valid  = data/coco_testdev
#valid = data/coco_val_5k.list
names = data/coco.names
backup = backup/
eval=coco