async def async_save_model(self, tokenizer, iteration):
        """Save actor model on rank 0.

        Returns:
            List: list of remote object refs.
        """
        save_tasks = [actor.save_model.remote(tokenizer, iteration) for actor in self._actor_handlers]
        return await asyncio.gather(*save_tasks)
Save actor model on rank 0.

        Returns:
            List: list of remote object refs.
        
orz/ppo/actors.py