code: def test_hex_tiles_gridsize_tuple_flat_orientation(self):
      tiles = HexTiles(
          [(0, 0), (0.5, 0.5), (-0.5, -0.5), (-0.4, -0.4)]
      ).opts(gridsize=(5, 10), orientation="flat")
      plot = bokeh_renderer.get_plot(tiles)
      glyph = plot.handles["glyph"]
      self.assertEqual(glyph.size, 0.13333333333333333)
      self.assertEqual(glyph.aspect_scale, 0.5)
  
imports: import numpy
  from holoviews.core import Dimension
  from holoviews.element import HexTiles
  from holoviews.plotting.bokeh.hex_tiles import hex_binning
  from holoviews.plotting.bokeh.util import property_to_dict
  from .test_plot import TestBokehPlot, bokeh_renderer
label_desc: Use image node_id 5 for calling the TestHexTilesPlot obj's underlying member method code with example usage: obj.test_hex_tiles_gridsize_tuple_flat_orientation() without return types