code: def testDynamicLengthGridEightConnectionFastLinking(self):
      PcnnTestTemplates.templateDynamicLengthFastLinking(
          25,
          20,
          conn_type.GRID_EIGHT,
          conn_represent.MATRIX,
          [0] * 25,
          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 6 for calling the PcnnUnitTest obj's underlying member method code with example usage: obj.testDynamicLengthGridEightConnectionFastLinking() without return types