code: def check():
      _check_python_350()
      _check_osx_numpy_backend()
      _check_optional_dependencies()
  
file_path: chainer/chainer/_environment_check.py
imports: from __future__ import absolute_import
  import os
  import sys
  import warnings
  import numpy.distutils.system_info
  import pkg_resources
  import chainer
label_desc: Use image node_id 4 for calling a global function with example usage: check() without return types