code: def experimental_as_proto(self):
      if isinstance(self, SerializableFromSuperClassOne):
          return serialization_test_pb2.MyMultiClassRepresentation(id=1)
  
      if isinstance(self, SerializableFromSuperClassTwo):
          return serialization_test_pb2.MyMultiClassRepresentation(id=2)
  
      if isinstance(self, SerializableFromSuperClassThree):
          return serialization_test_pb2.MyMultiClassRepresentation(id=3)
  
      raise NotImplementedError
  
imports: from tensorflow.core.function.trace_type import serialization
  from tensorflow.core.function.trace_type import serialization_test_pb2
  from tensorflow.python.platform import test
label_desc: Use image node_id 3 for calling the MySerializableSuperClass obj's underlying member method code with example usage: obj.experimental_as_proto() and returns: serialization_test_pb2, serialization_test_pb2, serialization_test_pb2