code: def get_default_mapping(self, z, cmapper):
          
  
          map_annular = dict(x=self.max_radius, y=self.max_radius,
                             inner_radius="inner_radius",
                             outer_radius="outer_radius",
                             start_angle="start_angle",
                             end_angle="end_angle",
                             fill_color={'field': z, 'transform': cmapper})
  
          map_seg_label = dict(x="x", y="y", text="text",
                               angle="angle", text_align="center")
  
          map_ann_label = dict(x="x", y="y", text="text",
                               angle="angle", text_align="center",
                               text_baseline="bottom")
  
          map_xmarks = dict(xs="xs", ys="ys")
  
          map_ymarks = dict(x= self.max_radius, y=self.max_radius,
                            start_angle=0, end_angle=2*np.pi, radius="radius")
  
          return {'annular_wedge_1': map_annular,
                  'text_1': map_seg_label,
                  'text_2': map_ann_label,
                  'multi_line_1': map_xmarks,
                  'arc_1': map_ymarks}
docs: Create dictionary containing default ColumnDataSource glyph to data
          mappings.