code: def test_ade20k_dataset(self):
      indices = np.random.permutation(np.arange(len(self.dataset)))
      for i in indices[:10]:
          img = self.dataset[i]
          assert_is_image(img, color=True)
  
file_path: chainercv/tests/datasets_tests/ade20k_tests/test_ade20k.py
imports: import numpy
  import unittest
  from chainer import testing
  from chainer.testing import attr
  from chainercv.datasets import ade20k_semantic_segmentation_label_names
  from chainercv.datasets import ADE20KSemanticSegmentationDataset
  from chainercv.datasets import ADE20KTestImageDataset
  from chainercv.utils import assert_is_semantic_segmentation_dataset
  from chainercv.utils.testing.assertions.assert_is_image import assert_is_image
label_desc: Use image node_id 2 for calling the TestADE20KTestImageDataset obj's underlying member method code with example usage: obj.test_ade20k_dataset() without return types