code: def _compile(self, arch):
      compiler.compile_using_nvrtc("", arch=arch)
  
imports: import pickle
  import unittest
  from unittest import mock
  import cupy
  from cupy.cuda import compiler
label_desc: Use image node_id 6 for calling the TestNvrtcArch obj's underlying member method code with example usage: obj._compile(arch) without return types