code: def test_tuple_dataset_cpu(self):
      self.check_tuple_dataset(self.x0, self.x1)
  
file_path: chainer/tests/chainer_tests/datasets_tests/test_tuple_dataset.py
imports: import unittest
  import numpy
  from chainer.backends import cuda
  from chainer import datasets
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 3 for calling the TestTupleDataset obj's underlying member method code with example usage: obj.test_tuple_dataset_cpu() without return types