code: def _get_goslimids_norel(self, dagslim):
          
          go_slims = set()
          go2obj = self.gosubdag.go2obj
          for goid in dagslim:
              goobj = go2obj[goid]
              if not goobj.relationship:
                  go_slims.add(goobj.id)
          return go_slims
docs: Get all GO slim GO IDs that do not have a relationship.