code: def test_binary_skelpe():
      def fn(x):
          d = scipy.ndimage.distance_transform_edt(x)
          pe = centrosome.filter.poisson_equation(x)
          return centrosome.cpmorphology.skeletonize(x, ordering=pe * d)
  
      binary_tteesstt("skelpe", fn)
  
imports: import io
  import centrosome.cpmorphology
  import centrosome.filter
  import numpy
  import pytest
  import scipy.ndimage
  import cellprofiler_core.image
  import cellprofiler_core.measurement
  import cellprofiler.modules.morph
  import cellprofiler_core.object
  import cellprofiler_core.pipeline
  import cellprofiler_core.setting
  import cellprofiler_core.workspace
  import tests.frontend.modules
label_desc: Use image node_id 21 for calling a global function with example usage: test_binary_skelpe() and returns: centrosome