code: def set_GW_options(self, nv_band=10, nc_band=10, n_iteration=5, n_grid=6,
                         dE_grid=0.5):
          
  
          self.GW_options.update(nv_corr=nv_band, nc_corr=nc_band,
                                 nit_gw=n_iteration)
          self.correlation_grid.update(dE_grid=dE_grid, n_grid=n_grid)
docs: Set parameters in cell.in for a GW computation
          :param nv__band: number of valence bands to correct with GW
          :param nc_band: number of conduction bands to correct with GW
          :param n_iteration: number of iteration
          :param n_grid and dE_grid:: number of points and spacing in eV for correlation grid