def unknown_actors(self, actor_decls):
        unknown_actors = [a for a, decl in actor_decls.iteritems() if not self.get_definition(decl['actor_type'])]
        return unknown_actors
Find unknown actors, i.e. actors that are declared in the script,
dataset/ETHPy150Open EricssonResearch/calvin-base/calvin/csparser/checker.py/Checker.unknown_actors