code: def _get_weights(self):
          
          weights = []
          n = float(self._rot_grid_points.shape[1])
          for r_gps in self._rot_grid_points:
              weights.append(np.sqrt(len(np.unique(r_gps)) / n))
          return weights
docs: Returns weights used for collision matrix and |X> and |f>
  
          self._rot_grid_points : ndarray
              shape=(ir_grid_points, point_operations), dtype='uintp'
  
          r_gps : grid points of arms of k-star with duplicates
              len(r_gps) == order of crystallographic point group
              len(unique(r_gps)) == number of arms of the k-star
  
          Returns
          -------
          weights : list
              sqrt(g_k)/|g|, where g is the crystallographic point group and
              g_k is the number of arms of k-star.