code: def check_dict_dataset(self, x, y):
      dd = datasets.DictDataset(x=x, y=y)
      self.assertEqual(len(dd), len(x))
  
      for i in range(len(x)):
          example = dd[i]
          self.assertIn("x", example)
          self.assertIn("y", example)
  
          numpy.testing.assert_array_equal(
              cuda.to_cpu(example["x"]), cuda.to_cpu(x[i])
          )
          numpy.testing.assert_array_equal(
              cuda.to_cpu(example["y"]), cuda.to_cpu(y[i])
          )
  
      example_range = dd[0 : len(x)]
      for i in range(len(x)):
          example = example_range[i]
          self.assertIn("x", example)
          self.assertIn("y", example)
  
          numpy.testing.assert_array_equal(
              cuda.to_cpu(example["x"]), cuda.to_cpu(x[i])
          )
          numpy.testing.assert_array_equal(
              cuda.to_cpu(example["y"]), cuda.to_cpu(y[i])
          )
  
file_path: chainer/tests/chainer_tests/datasets_tests/test_dict_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 2 for calling the TestDictDataset obj's underlying member method code with example usage: obj.check_dict_dataset(x, y) without return types