code: def cancel(self):
      if self.awthread is not None:
          self.awthread.stop_heartbeat = True
      self.notify_pub_socket.send(
          cellprofiler_core.constants.worker.NOTIFY_STOP
      )
  
imports: import io
  import queue
  import time
  import os
  import pytest
  import pickle
  import tempfile
  import threading
  import traceback
  import unittest
  import uuid
  import zlib
  import numpy
  import zmq
  import cellprofiler_core.analysis
  import cellprofiler_core.analysis.reply
  import cellprofiler_core.constants.measurement
  import cellprofiler_core.constants.worker
  import cellprofiler_core.measurement
  import cellprofiler_core.module._identify
  import cellprofiler_core.modules.namesandtypes
  import cellprofiler_core.pipeline
  import cellprofiler_core.preferences
  import cellprofiler_core.utilities.image
  import cellprofiler_core.utilities.measurement
  import cellprofiler_core.utilities.pathname
  import cellprofiler_core.utilities.zmq
  import cellprofiler_core.worker
  import cellprofiler_core.analysis.request
  from cellprofiler_core.constants.modules.namesandtypes import M_IMAGE_SET_ZIP_DICTIONARY
  from cellprofiler_core.pipeline import ImageFile
  from cellprofiler_core.pipeline import ImagePlane
  import tests.core
  import tests.core.modules
label_desc: Use image node_id 2 for calling the TestAnalysisWorker obj's underlying member method code with example usage: obj.cancel() without return types