code: def plot(self, *args, **kwargs):
          
          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)
docs: Plot latent space X in 1D:
  
          See  GPy.plotting.matplot_dep.variational_plots