code: def test_cuda_init_fork(self):
      ret, stdoutdata, stderrdata = _run_test_snippet(
          "cuda_init.py", "@cupy:0", "fork"
      )
      assert ret == 0, "[stdout]:{!r}\n" "[stderr]:{!r}".format(
          stdoutdata, stderrdata
      )
  
imports: import copy
  import os
  import subprocess
  import sys
  import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  import chainer.functions.math.minmax
  from chainer import initializers
  import chainer.reporter
  from chainer import testing
  from chainer.testing import attr
  import chainer.training.updaters.multiprocess_parallel_updater
label_desc: Use image node_id 1 for calling the TestCUDAContext obj's underlying member method code with example usage: obj.test_cuda_init_fork() without return types