code: def testDynamicLengthGridFourConnectionByCore(self):
      PcnnTestTemplates.templateDynamicLength(
          25, 20, conn_type.GRID_FOUR, None, [0] * 25, True
      )
  
imports: import unittest
  from pyclustering.nnet.tests.pcnn_templates import PcnnTestTemplates
  from pyclustering.nnet import conn_type, conn_represent
  from pyclustering.core.tests import remove_library
label_desc: Use image node_id 2 for calling the PcnnIntegrationTest obj's underlying member method code with example usage: obj.testDynamicLengthGridFourConnectionByCore() without return types