code: def testVisualizeRectangeRepresentation3x5(self):
      visualizer = cluster_visualizer(15, 5)
  
      for i in range(15):
          sample = read_sample(SIMPLE_SAMPLES.SAMPLE_SIMPLE1)
          visualizer.append_clusters([sample], None, i, markersize=5)
  
      figure = visualizer.show()
      visualizer.close(figure)
  
imports: import unittest
  import matplotlib
  import matplotlib.pyplot
  import numpy
  import random
  from pyclustering.samples.definitions import SIMPLE_SAMPLES, FCPS_SAMPLES
  from pyclustering.utils import read_sample
  from pyclustering.cluster import cluster_visualizer
  from pyclustering.cluster.dbscan import dbscan
  from pyclustering.cluster.cure import cure
label_desc: Use image node_id 16 for calling the Test obj's underlying member method code with example usage: obj.testVisualizeRectangeRepresentation3x5() without return types