docstr: Check for the existence of the resource tracker process.
docstr_tok: ["Check","for","the","existence","of","the","resource","tracker","process","."]
code: def _check_alive(self):
      """Check for the existence of the resource tracker process."""
      try:
          self._send("PROBE", "", "")
      except BrokenPipeError:
          return False
      else:
          return True
  
file_path: catboost/contrib/python/joblib/joblib/externals/loky/backend/resource_tracker.py
imports: import os
  import shutil
  import sys
  import signal
  import warnings
  import threading
  from _multiprocessing import sem_unlink
  from multiprocessing import util
  from .None import spawn
label_desc: Use image node_id 4 for calling the ResourceTracker obj's underlying member method code with example usage: obj._check_alive() and returns: True, False