code: def testKnownAndUnknownDimensions(self):
      known = tensor_shape.Dimension(12)
      unknown = tensor_shape.Dimension(None)
      self.assertEqual(
          tensor_shape.Dimension(None).value, (known + unknown).value
      )
      self.assertEqual(
          tensor_shape.Dimension(None).value, (unknown + known).value
      )
      self.assertEqual(
          tensor_shape.Dimension(None).value, (known * unknown).value
      )
      self.assertEqual(
          tensor_shape.Dimension(None).value, (unknown * known).value
      )
      self.assertEqual(
          tensor_shape.Dimension(None).value, (known // unknown).value
      )
      self.assertEqual(
          tensor_shape.Dimension(None).value, (unknown // known).value
      )
      self.assertEqual(
          tensor_shape.Dimension(12), known.merge_with(unknown)
      )
      self.assertEqual(
          tensor_shape.Dimension(12), unknown.merge_with(known)
      )
      self.assertIsNone(
          tensor_shape.Dimension(12) < tensor_shape.Dimension(None)
      )
      self.assertIsNone(
          tensor_shape.Dimension(12) <= tensor_shape.Dimension(None)
      )
      self.assertIsNone(
          tensor_shape.Dimension(12) > tensor_shape.Dimension(None)
      )
      self.assertIsNone(
          tensor_shape.Dimension(12) >= tensor_shape.Dimension(None)
      )
      self.assertIsNone(
          tensor_shape.Dimension(None) < tensor_shape.Dimension(12)
      )
      self.assertIsNone(
          tensor_shape.Dimension(None) <= tensor_shape.Dimension(12)
      )
      self.assertIsNone(
          tensor_shape.Dimension(None) > tensor_shape.Dimension(12)
      )
      self.assertIsNone(
          tensor_shape.Dimension(None) >= tensor_shape.Dimension(12)
      )
  
imports: from absl.testing import parameterized
  from tensorflow.core.framework import tensor_shape_pb2
  from tensorflow.core.function import trace_type
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 3 for calling the DimensionTest obj's underlying member method code with example usage: obj.testKnownAndUnknownDimensions() without return types