code: def test_polygon():
      p = p0 + stat_density_2d(
          aes(fill=after_stat("level")), geom="polygon"
      )
      assert p == "polygon"
  
imports: import pandas
  from plotnine import aes, after_stat, geom_density_2d, geom_point, ggplot, lims, scale_size_radius, stat_density_2d
label_desc: Use image node_id 3 for calling a global function with example usage: test_polygon() without return types