code: def test_no_duplicate_definition():
      fig = Figure()
      axs = fig.subplots(4, 4, subplot_kw=dict(projection="polar"))
      for ax in axs.flat:
          ax.set(xticks=[], yticks=[])
          ax.plot([1, 2])
      fig.suptitle("hello, world")
  
      buf = io.StringIO()
      fig.savefig(buf, format="eps")
      buf.seek(0)
  
      wds = [
          ln.partition(" ")[0]
          for ln in buf.readlines()
          if ln.startswith("/")
      ]
  
      assert max(Counter(wds).values()) == 1
  
imports: from collections import Counter
  from pathlib import Path
  import io
  import re
  import tempfile
  import numpy
  import pytest
  from matplotlib import cbook, path, patheffects, font_manager
  from matplotlib.figure import Figure
  from matplotlib.patches import Ellipse
  from matplotlib.testing._markers import needs_ghostscript, needs_usetex
  from matplotlib.testing.decorators import check_figures_equal, image_comparison
  import matplotlib
  import matplotlib.collections
  import matplotlib.colors
  import matplotlib.pyplot
label_desc: Use image node_id 19 for calling a global function with example usage: test_no_duplicate_definition() without return types