code: def get_relationship_targets(item_ids, relationships, id2rec):
      
      # Requirements to use this function:
      #     1) item Terms must have been loaded with 'relationships'
      #     2) item IDs in 'item_ids' arguement must be present in id2rec
      #     3) Arg, 'relationships' must be True or an iterable
      reltgt_objs_all = set()
      for goid in item_ids:
          obj = id2rec[goid]
          for reltype, reltgt_objs_cur in obj.relationship.items():
              if relationships is True or reltype in relationships:
                  reltgt_objs_all.update(reltgt_objs_cur)
      return reltgt_objs_all
docs: Get item ID set of item IDs in a relationship target set.