code: def ray_get_and_free(object_ids):
      
  
      global _last_free_time
      global _to_free
  
      result = ray.get(object_ids)
      if type(object_ids) is not list:
          object_ids = [object_ids]
      _to_free.extend(object_ids)
  
      # batch calls to free to reduce overheads
      now = time.time()
      if (len(_to_free) > MAX_FREE_QUEUE_SIZE
              or now - _last_free_time > FREE_DELAY_S):
          ray.internal.free(_to_free)
          _to_free = []
          _last_free_time = now
  
      return result
docs: Call ray.get and then queue the object ids for deletion.
  
      This function should be used whenever possible in RLlib, to optimize
      memory usage. The only exception is when an object_id is shared among
      multiple readers.
  
      Args:
          object_ids (ObjectID|List[ObjectID]): Object ids to fetch and free.
  
      Returns:
          The result of ray.get(object_ids).