code: def test_assert_is_label_dataset(self):
      if hasattr(self, "option"):
          dataset = self.dataset(self.color, self.option)
      else:
          dataset = self.dataset(self.color)
  
      if self.valid:
          assert_is_label_dataset(dataset, 20, color=self.color)
      else:
          with self.assertRaises(AssertionError):
              assert_is_label_dataset(dataset, 20, color=self.color)
  
imports: import numpy
  import unittest
  from chainer.dataset import DatasetMixin
  from chainer import testing
  from chainercv.utils import assert_is_label_dataset
label_desc: Use image node_id 1 for calling the TestAssertIsLabelDataset obj's underlying member method code with example usage: obj.test_assert_is_label_dataset() without return types