docstr: Generate ColumnDataSource dictionary for segment labels.
code: def _get_seg_labels_data(self, order_seg, bins_seg):
      """
      Generate ColumnDataSource dictionary for segment labels.
      """
      if self.xticks is None:
          return dict(x=[], y=[], text=[], angle=[])
  
      mapping = self._compute_tick_mapping("angle", order_seg, bins_seg)
  
      values = [
          (text, ((end - start) / 2) + start)
          for text, (start, end) in mapping.items()
      ]
  
      labels, radiant = zip(*values)
      radiant = np.array(radiant)
  
      y_coord = np.sin(radiant) * self.max_radius + self.max_radius
      x_coord = np.cos(radiant) * self.max_radius + self.max_radius
  
      return dict(
          x=x_coord, y=y_coord, text=labels, angle=1.5 * np.pi + radiant
      )
  
imports: import numpy
  import param
  from bokeh.models.glyphs import AnnularWedge
  from ...core.data import GridInterface
  from ...core.spaces import HoloMap
  from ...core.util import dimension_sanitizer, is_nan
  from .element import ColorbarPlot, CompositeElementPlot
  from .selection import BokehOverlaySelectionDisplay
  from .styles import base_properties, fill_properties, line_properties, text_properties
label_desc: Use image node_id 11 for calling the RadialHeatMapPlot obj's underlying member method code with example usage: obj._get_seg_labels_data(order_seg, bins_seg) and returns: dict, dict