code: def shutdown(self):
      self.worker_pool.close()
      for a_result in self.async_results_queue:
          # wait for remaining tasks to finish
          # process workers will hang otherwise
          a_result.wait(timeout=self.timeout)
      self.worker_pool.terminate()
      self.worker_pool.join()
  
imports: import multiprocessing.pool
  import os
  import typing
  import jax
  import jax.numpy
  import numpy
  from .data_adapter import DataAdapter
  from .utils import is_none_or_empty
label_desc: Use image node_id 5 for calling the MultiProcessIterator obj's underlying member method code with example usage: obj.shutdown() without return types