def plot(self, *args, **kwargs):
        """
        Plot latent space X in 1D:

        See  GPy.plotting.matplot_dep.variational_plots
        """
        import sys
        assert "matplotlib" in sys.modules, "matplotlib package has not been imported."
        from ...plotting.matplot_dep import variational_plots
        return variational_plots.plot_SpikeSlab(self,*args, **kwargs)