Given a HoloViews Viewable return a corresponding plot instance.

def get_plot(self_or_cls, obj, renderer=None, **kwargs):
        """
        Given a HoloViews Viewable return a corresponding plot instance.
        """
        if isinstance(obj, DynamicMap) and obj.unbounded:
            dims = ', '.join('%r' % dim for dim in obj.unbounded)
            msg = ('DynamicMap cannot be displayed without explicit indexing '
                   'as {dims} dimension(s) are unbounded. '
                   '\nSet dimensions bounds with the DynamicMap redim.range '
                   'or redim.values methods.')
            raise SkipRendering(msg.format(dims=dims))

        # Initialize DynamicMaps with first data item
        initialize_dynamic(obj)

        if not isinstance(obj, Plot):
            if not displayable(obj):
                obj = collate(obj)
                initialize_dynamic(obj)
            obj = Compositor.map(obj, mode='data', backend=self_or_cls.backend)

        if not renderer:
            renderer = self_or_cls
            if not isinstance(self_or_cls, Renderer):
                renderer = self_or_cls.instance()
        if not isinstance(obj, Plot):
            obj = Layout.from_values(obj) if isinstance(obj, AdjointLayout) else obj
            plot_opts = dict(self_or_cls.plot_options(obj, self_or_cls.size),
                             **kwargs)
            plot = self_or_cls.plotting_class(obj)(obj, renderer=renderer,
                                                   **plot_opts)
            defaults = [kd.default for kd in plot.dimensions]
            init_key = tuple(v if d is None else d for v, d in
                             zip(plot.keys[0], defaults))
            plot.update(init_key)
        else:
            plot = obj
        return plot