code: def test_get_data_yseparators(self):
      plot = mpl_renderer.get_plot(self.element.opts(ymarks=4))
      data, style, ticks = plot.get_data(
          self.element, {"z": {"combined": (0, 3)}}, {}
      )
      yseparators = data["yseparator"]
      for circle, r in zip(yseparators, [0.25, 0.375]):
          self.assertEqual(circle.radius, r)
  
file_path: holoviews/holoviews/tests/plotting/matplotlib/test_radialheatmap.py
imports: from itertools import product
  import numpy
  from holoviews.core.spaces import HoloMap
  from holoviews.element.raster import HeatMap
  from .test_plot import TestMPLPlot, mpl_renderer
label_desc: Use image node_id 4 for calling the RadialHeatMapPlotTests obj's underlying member method code with example usage: obj.test_get_data_yseparators() without return types