code: def test_assert_is_semantic_segmentation_link(self):
      if self.valid:
          assert_is_semantic_segmentation_link(self.link, 21)
      else:
          with self.assertRaises(AssertionError):
              assert_is_semantic_segmentation_link(self.link, 21)
  
imports: import numpy
  import unittest
  import chainer
  from chainercv.utils import assert_is_semantic_segmentation_link
  from chainercv.utils import testing
label_desc: Use image node_id 1 for calling the TestAssertIsSemanticSegmentationLink obj's underlying member method code with example usage: obj.test_assert_is_semantic_segmentation_link() without return types