Hi, thanks or your reply
I thought if I initialize the new layers in way that be the same as identity then first epoch be the same as first network and output be ok, but the new network’s output is not the same as the first network’s output in last epoch.
on the other hand, the new network takes much more time or each epoch (number of parameters in first network near 20000 and new network parameters near60)
and new network’s out put is not good at all. its output is a gray picture and in each epoch  change a little.