def METHOD_NAME(self) -> _FabricExperimentWriter:
    r"""
    Actual _ExperimentWriter object. To use _ExperimentWriter features in your
    :class:`~lightning.pytorch.core.module.LightningModule` do the following.
    Example::
        self.logger.experiment.some_experiment_writer_function()
    """
    if self._experiment is not None:
        return self._experiment
    self._fs.makedirs(self.root_dir, exist_ok=True)
    self._experiment = ExperimentWriter(log_dir=self.log_dir)
    return self._experiment