Solved by albanD in post #6 
              
              
                I’m afraid it is not   It will be once NestedTensor is merged though  
If you want to make sure not to do any extra copy, I would advise not to use advanced indexing (like data[i, j, :]) and only use the .select() and .narrow() methods. If you only use these two methods, you are 100% sure you’re not…