Solved by Joker in post #3 
              
              
                @Nikronic  Thanks  for your  help  ,  friend .I  solve  it . 
After  reading   your   posts   and  pytorch  doc    about   torch.clone()  , 
clone() → Tensor 
Returns a copy of the self tensor. The copy has the same size and data type as self.

NOTE

Unlike copy_(), this function is recorded in the …