code: def testDeletion(self):
      table = type_dispatch.TypeDispatchTable()
      table.add_target(make_shape_function_type(None, None))
      table.add_target(make_shape_function_type(None, 1))
      table.add_target(make_shape_function_type(None, 2))
  
      self.assertEqual(
          list(table.targets),
          [
              make_shape_function_type(None, None),
              make_shape_function_type(None, 1),
              make_shape_function_type(None, 2),
          ],
      )
  
      table.delete(
          make_shape_function_type(None, 2)
      )  # Should remove the target
  
      self.assertEqual(
          list(table.targets),
          [
              make_shape_function_type(None, None),
              make_shape_function_type(None, 1),
          ],
      )
  
      table.delete(
          make_shape_function_type(None, 2)
      )  # Should have no effect
  
      self.assertEqual(
          list(table.targets),
          [
              make_shape_function_type(None, None),
              make_shape_function_type(None, 1),
          ],
      )
  
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 4 for calling the TypeDispatchTableTest obj's underlying member method code with example usage: obj.testDeletion() without return types