code: def get_size(self_or_cls, plot):
          
          if isinstance(plot, Plot):
              plot = plot.state
          elif not isinstance(plot, Model):
              raise ValueError('Can only compute sizes for HoloViews '
                               'and bokeh plot objects.')
          return compute_plot_size(plot)
docs: Return the display size associated with a plot before
          rendering to any particular format. Used to generate
          appropriate HTML display.
  
          Returns a tuple of (width, height) in pixels.