code: def _draw_markers(self, plot, element, marks, axis="x"):
      if marks is None or self.radial:
          return
      self.param.warning(
          "Only radial HeatMaps supports marks, to make the"
          "HeatMap quads for distinguishable set a line_width"
      )
  
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 5 for calling the HeatMapPlot obj's underlying member method code with example usage: obj._draw_markers(plot, element, marks, axis) without return types