code: def _Popen(process_obj):
      if sys.platform == "win32":
          from .popen_loky_win32 import Popen
      else:
          from .popen_loky_posix import Popen
      return Popen(process_obj)
  
file_path: catboost/contrib/python/joblib/joblib/externals/loky/backend/process.py
imports: import sys
  from multiprocessing.context import assert_spawning
  from multiprocessing.process import BaseProcess
label_desc: Use image node_id 2 for calling the LokyProcess obj's underlying member method code with example usage: obj._Popen(process_obj) and returns: Popen