Fixes for training Yolo on small objects

AlexeyAB

2018-02-07 9ff40baa4f0b005d50c4e3302b4103551160943f

1
2
3
+++++
val_eq (Val.add (Val.add (r3 PC) Vone) Vone) (Val.add (x2 PC) Vone)
*****