old_contents: from xchainer._core import *  # NOQA
  
  _global_context = Context()
  _global_context.get_backend('native')
  set_global_default_context(_global_context)
  
new_contents: from xchainer._core import *  # NOQA
  
  _global_context = Context()
  set_global_default_context(_global_context)
  set_default_device('native')
  
subject: Set the default device to native in Python binding