code: def convert_to_ieee(self, structure, initial_fit=True,
                          refine_rotation=True):
          
          rotation = self.get_ieee_rotation(structure, refine_rotation)
          result = self.copy()
          if initial_fit:
              result = result.fit_to_structure(structure)
          return result.rotate(rotation, tol=1e-2)
docs: Given a structure associated with a tensor, attempts a
          calculation of the tensor in IEEE format according to
          the 1987 IEEE standards.
  
          Args:
              structure (Structure): a structure associated with the
                  tensor to be converted to the IEEE standard
              initial_fit (bool): flag to indicate whether initial
                  tensor is fit to the symmetry of the structure.
                  Defaults to true. Note that if false, inconsistent
                  results may be obtained due to symmetrically
                  equivalent, but distinct transformations
                  being used in different versions of spglib.
              refine_rotation (bool): whether to refine the rotation
                  produced by the ieee transform generator, default True