code: def rate_limit(iterable, qps: Union[int, float]):
      """Rate limit an iterator."""
      for item in iterable:
          yield item
          time.sleep(1.0 / qps)
  
imports: from collections.abc import Callable, Collection, Iterable, Iterator, Mapping, Sequence
  import itertools
  import queue
  import threading
  import time
  from typing import Any, Optional, TypeVar, Union
  import uuid
  from lit_nlp.api import types
  import numpy
label_desc: Use image node_id 9 for calling a global function with example usage: rate_limit(iterable, qps) without return types