code: def do_execute(self):
          
          generator = datagen.DataGenerator.make_copy(self.resolve_option("setup"))
          generator.dataset_format = generator.define_data_format()
          if bool(self.resolve_option("incremental")) and generator.single_mode_flag:
              for i in range(generator.num_examples_act):
                  self._output.append(Token(generator.generate_example()))
          else:
              data = generator.generate_examples()
              self._output.append(Token(data))
          return None
docs: The actual execution of the actor.
  
          :return: None if successful, otherwise error message
          :rtype: str