class_docstr: A ConcurrentVentilator handles ventilation of a pre-determined list of items to a worker pool and performs
  the ventilation concurrently in a separate thread. It will keep track of how many items are currently in the
  ventilation queue and prevent it from monotonically increasing in order to prevent boundless memory requirements.
  It allows for multiple (or infinite) iterations of ventilating the items, optionally randomizing the order of
  items being ventilated at the start of each iteration.
class_docstr_tok: ["A","ConcurrentVentilator","handles","ventilation","of","a","pre-determined","list","of","items","to","a","worker","pool","and","performs","the","ventilation","concurrently","in","a","separate","thread",".","It","will","keep","track","of","how","many","items","are","currently","in","the","ventilation","queue","and","prevent","it","from","monotonically","increasing","in","order","to","prevent","boundless","memory","requirements",".","It","allows","for","multiple","(","or","infinite",")","iterations","of","ventilating","the","items",",","optionally","randomizing","the","order","of","items","being","ventilated","at","the","start","of","each","iteration","."]
code: def completed(self):
      assert (
          self._iterations_remaining is None
          or self._iterations_remaining >= 0
      )
      return (
          self._stop_requested
          or self._iterations_remaining == 0
          or not self._items_to_ventilate
      )
  
imports: import numpy
  import threading
  from abc import ABCMeta, abstractmethod
  from time import sleep
  import six
label_desc: Use image node_id 4 for calling the ConcurrentVentilator obj's underlying member method code with example usage: obj.completed() and returns: unknown