code: def test_cityscapes_semantic_segmentation_dataset(self):
      assert_is_semantic_segmentation_dataset(
          self.dataset, self.n_class, n_example=10
      )
  
imports: import numpy
  import os
  import shutil
  import tempfile
  import unittest
  from chainer import testing
  from chainer.testing import attr
  from chainercv.datasets.cityscapes.cityscapes_utils import cityscapes_labels
  from chainercv.datasets import CityscapesSemanticSegmentationDataset
  from chainercv.datasets import CityscapesTestImageDataset
  from chainercv.utils import assert_is_semantic_segmentation_dataset
  from chainercv.utils.testing.assertions.assert_is_image import assert_is_image
  from chainercv.utils import write_image
label_desc: Use image node_id 4 for calling the TestCityscapesSemanticSegmentationDataset obj's underlying member method code with example usage: obj.test_cityscapes_semantic_segmentation_dataset() without return types