code: def _loop_no_cache(self, helper_function, num, fragment):
          
          self.log([u"Examining fragment %d (no cache)...", num])
          # synthesize and get the duration of the output file
          voice_code = self._language_to_voice_code(fragment.language)
          self.log(u"Calling helper function")
          succeeded, data = helper_function(
              text=fragment.filtered_text,
              voice_code=voice_code,
              output_file_path=None,
              return_audio_data=True
          )
          # check output
          if not succeeded:
              self.log_crit(u"An unexpected error occurred in helper_function")
              return (False, None)
          self.log([u"Examining fragment %d (no cache)... done", num])
          return (True, data)
docs: Synthesize all fragments without using the cache