code: def plot_groups_unplaced(self, fout_dir=".", **kws_pltargs):
          
          hdrgos = self.grprobj.get_hdrgos_unplaced()
          pltargs = PltGroupedGosArgs(self.grprobj, fout_dir=fout_dir, **kws_pltargs)
          return self._plot_groups_hdrgos(hdrgos, pltargs)
docs: Plot GO DAGs for groups of user GOs which are not in a section.