code: def testVisualizerNoFailure(self):
      stimulus = [
          5,
          5,
          5,
          5,
          10,
          10,
          10,
          10,
          15,
          15,
          15,
          15,
          20,
          20,
          20,
          20,
      ]
      PcnnTestTemplates.visualize(
          16,
          20,
          conn_type.ALL_TO_ALL,
          conn_represent.MATRIX,
          stimulus,
          4,
          4,
          False,
      )
  
imports: import unittest
  from pyclustering.nnet.tests.pcnn_templates import PcnnTestTemplates
  from pyclustering.nnet import conn_type, conn_represent
label_desc: Use image node_id 20 for calling the PcnnUnitTest obj's underlying member method code with example usage: obj.testVisualizerNoFailure() without return types