code: def stop_call(self):
      # The explicit call to clear is required to break a cycling reference
      # to the futures.
      self._continue = False
      # wait for the future collection routine (self._backend._collect) to
      # finish in order to limit asyncio warnings due to aborting _collect
      # during a following backend termination call
      time.sleep(0.01)
      self.call_data_futures.clear()
  
imports: from __future__ import print_function, division, absolute_import
  import asyncio
  import concurrent.futures
  import contextlib
  import time
  from uuid import uuid4
  import weakref
  from .parallel import parallel_config
  from .parallel import AutoBatchingMixin, ParallelBackendBase
label_desc: Use image node_id 6 for calling the DaskDistributedBackend obj's underlying member method code with example usage: obj.stop_call() without return types