code: def test_tuple_dataset_gpu(self):
      self.check_tuple_dataset(
          cuda.to_gpu(self.x0), cuda.to_gpu(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 4 for calling the TestTupleDataset obj's underlying member method code with example usage: obj.test_tuple_dataset_gpu() without return types