code: def denorm(self,arr):
          
          if type(arr) is not np.ndarray: arr = to_np(arr)
          if len(arr.shape)==3: arr = arr[None]
          return self.transform.denorm(np.rollaxis(arr,1,4))
docs: Reverse the normalization done to a batch of images.
  
          Arguments:
              arr: of shape/size (N,3,sz,sz)