code: def testClusteringOrderVisualizer(self):
      sample = read_sample(SIMPLE_SAMPLES.SAMPLE_SIMPLE4)
  
      optics_instance = optics(sample, 6.0, 3, 5)
      optics_instance.process()
  
      analyser = ordering_analyser(optics_instance.get_ordering())
      ordering_visualizer.show_ordering_diagram(analyser, 5)
  
imports: import unittest
  import matplotlib
  from pyclustering.cluster.tests.optics_templates import OpticsTestTemplates
  from pyclustering.cluster.optics import optics, ordering_analyser, ordering_visualizer
  from pyclustering.utils import read_sample
  from pyclustering.samples.definitions import SIMPLE_SAMPLES, FCPS_SAMPLES
label_desc: Use image node_id 33 for calling the OpticsUnitTest obj's underlying member method code with example usage: obj.testClusteringOrderVisualizer() without return types