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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def summary_pb(self):
 """Create a top-level experiment summary describing this experiment. The resulting summary should be written to a log directory that encloses all the individual sessions' log directories. Analogous to the low-level `experiment_pb` function in the `hparams.summary` module. """

    hparam_infos = []
    for hparam in self._hparams:
      info = api_pb2.HParamInfo(
          name=hparam.name,
          description=hparam.description,
          display_name=hparam.display_name,
      )
      domain = hparam.domain
      if domain is not None:
        domain.update_hparam_info(info)
      hparam_infos.append(info)
    metric_infos = [metric.as_proto() for metric in self._metrics]
    return summary.experiment_pb(
        hparam_infos=hparam_infos,
        metric_infos=metric_infos,
        user=self._user,
        description=self._description,
        time_created_secs=self._time_created_secs,
    )