code: def finalize_options(self):
      build_ext.finalize_options(self)
      if self.parallel is None:
          # Do not override self.parallel if already defined by
          # command-line flag (--parallel or -j)
  
          parallel = os.environ.get("SKLEARN_BUILD_PARALLEL")
          if parallel:
              self.parallel = int(parallel)
      if self.parallel:
          print("setting parallel=%d " % self.parallel)
  
imports: import importlib
  import os
  import platform
  import shutil
  import sys
  import traceback
  from os.path import join
  from setuptools import Command, Extension, setup
  from setuptools.command.build_ext import build_ext
  import sklearn
  import sklearn._min_dependencies
  from sklearn._build_utils import _check_cython_version
  from sklearn.externals._packaging.version import parse
label_desc: Use image node_id 1 for calling the build_ext_subclass obj's underlying member method code with example usage: obj.finalize_options() without return types