code: def testGeneralizedUnknown(self):
      table = type_dispatch.TypeDispatchTable()
      table.add_target(make_shape_function_type(None, 1))
      table.add_target(make_shape_function_type(None, 2))
      table.add_target(make_shape_function_type(None, 3))
      self.assertEqual(
          table.try_generalizing_function_type(
              make_shape_function_type(None, 4, 3)
          ),
          make_shape_function_type(None, 4, 3),
      )
  
imports: from typing import Optional
  from tensorflow.core.function.polymorphism import function_type
  from tensorflow.core.function.polymorphism import type_dispatch
  from tensorflow.python.platform import test
  from tensorflow.python.types import trace
label_desc: Use image node_id 14 for calling the TypeDispatchTableTest obj's underlying member method code with example usage: obj.testGeneralizedUnknown() without return types