affinex and affiney in loss.py

[Chung-Yi]

affinex = tf.stack([tf.maximum(affine_pred[...,0],0.),affine_pred[...,1],affine_pred[...,2]],3)

affiney = tf.stack([affine_pred[...,3],tf.maximum(affine_pred[...,4],0.),affine_pred[...,5]],3)

affinex and affiney mismatch with the paper