code: def is_periodic_image(self, other, tolerance=1e-8, check_lattice=True):
          
          if check_lattice and self.lattice != other.lattice:
              return False
          if self.species != other.species:
              return False
  
          frac_diff = pbc_diff(self.frac_coords, other.frac_coords)
          return np.allclose(frac_diff, [0, 0, 0], atol=tolerance)
docs: Returns True if sites are periodic images of each other.
  
          Args:
              other (PeriodicSite): Other site
              tolerance (float): Tolerance to compare fractional coordinates
              check_lattice (bool): Whether to check if the two sites have the
                  same lattice.
  
          Returns:
              bool: True if sites are periodic images of each other.