code: def tuple(self, r):
          
  
          m, n, t = self.args
          r, k = divmod(r, t)
          r, u = divmod(r, 2)
          i, j = divmod(r, n)
          return i, j, u, k
docs: Converts the linear_index `q` into an chimera_index
  
          Parameters
          ----------
          r : int
              The linear_index node label    
  
          Returns
          -------
          q : tuple
              The chimera_index node label corresponding to r