How to use the autogalaxy.GalaxyModel function in autogalaxy

hyper_galaxy=hyper_galaxy,
                )

        else:

            if source_as_model:

                return ag.GalaxyModel(
                    redshift=af.last.instance.galaxies.source.redshift,
                    pixelization=af.last.hyper_combined.instance.galaxies.source.pixelization,
                    regularization=af.last.hyper_combined.model.galaxies.source.regularization,
                )

            else:

                return ag.GalaxyModel(
                    redshift=af.last.instance.galaxies.source.redshift,
                    pixelization=af.last[
                        index
                    ].hyper_combined.instance.galaxies.source.pixelization,
                    regularization=af.last[
                        index
                    ].hyper_combined.instance.galaxies.source.regularization,
                    hyper_galaxy=hyper_galaxy,
                )

1) The lens light model uses the light model of the Light pipeline.
        2) The lens light is returned as a model if *fix_lens_light* is *False, an instance if *True*.

        Parameters
        ----------
        redshift_lens : float
            The redshift of the lens galaxy.
        mass : ag.MassProfile
            The mass model of the len galaxy.
        shear : ag.ExternalShear
            The external shear of the lens galaxy.
        """

        if self.mass.fix_lens_light:

            return ag.GalaxyModel(
                redshift=redshift_lens,
                bulge=af.last.instance.galaxies.lens.bulge,
                disk=af.last.instance.galaxies.lens.disk,
                mass=mass,
                shear=shear,
                hyper_galaxy=af.last.hyper_combined.instance.optional.galaxies.lens.hyper_galaxy,
            )

        else:

            return ag.GalaxyModel(
                redshift=redshift_lens,
                bulge=af.last.model.galaxies.lens.bulge,
                disk=af.last.model.galaxies.lens.disk,
                mass=mass,
                shear=shear,

hyper_galaxy.contribution_factor = (
                af.last.hyper_combined.instance.optional.galaxies.source.hyper_galaxy.contribution_factor
            )
            hyper_galaxy.noise_power = (
                af.last.hyper_combined.instance.optional.galaxies.source.hyper_galaxy.noise_power
            )

        else:

            hyper_galaxy = None

        if self.source.type_tag in "sersic":

            if source_as_model:

                return ag.GalaxyModel(
                    redshift=af.last[index].model.galaxies.source.redshift,
                    sersic=af.last[index].model.galaxies.source.sersic,
                    hyper_galaxy=hyper_galaxy,
                )

            else:

                return ag.GalaxyModel(
                    redshift=af.last[index].instance.galaxies.source.redshift,
                    sersic=af.last[index].instance.galaxies.source.sersic,
                    hyper_galaxy=hyper_galaxy,
                )

        else:

            if source_as_model:

hyper_galaxy=hyper_galaxy,
                )

            else:

                return ag.GalaxyModel(
                    redshift=af.last[index].instance.galaxies.source.redshift,
                    sersic=af.last[index].instance.galaxies.source.sersic,
                    hyper_galaxy=hyper_galaxy,
                )

        else:

            if source_as_model:

                return ag.GalaxyModel(
                    redshift=af.last.instance.galaxies.source.redshift,
                    pixelization=af.last.hyper_combined.instance.galaxies.source.pixelization,
                    regularization=af.last.hyper_combined.model.galaxies.source.regularization,
                )

            else:

                return ag.GalaxyModel(
                    redshift=af.last.instance.galaxies.source.redshift,
                    pixelization=af.last[
                        index
                    ].hyper_combined.instance.galaxies.source.pixelization,
                    regularization=af.last[
                        index
                    ].hyper_combined.instance.galaxies.source.regularization,
                    hyper_galaxy=hyper_galaxy,

hyper_galaxy = None

        if self.source.type_tag in "sersic":

            if source_as_model:

                return ag.GalaxyModel(
                    redshift=af.last[index].model.galaxies.source.redshift,
                    sersic=af.last[index].model.galaxies.source.sersic,
                    hyper_galaxy=hyper_galaxy,
                )

            else:

                return ag.GalaxyModel(
                    redshift=af.last[index].instance.galaxies.source.redshift,
                    sersic=af.last[index].instance.galaxies.source.sersic,
                    hyper_galaxy=hyper_galaxy,
                )

        else:

            if source_as_model:

                return ag.GalaxyModel(
                    redshift=af.last.instance.galaxies.source.redshift,
                    pixelization=af.last.hyper_combined.instance.galaxies.source.pixelization,
                    regularization=af.last.hyper_combined.model.galaxies.source.regularization,
                )

            else: