code: def CoefficientOfNetworkComplexity_metric(bpmn_graph):
      
  
      return float(len(bpmn_graph.get_flows())) / float(len(bpmn_graph.get_nodes()))
docs: Returns the value of the Coefficient of Network Complexity metric
      ("Ratio of the total number of arcs in a process model to its total number of nodes.")
      for the BPMNDiagramGraph instance.
  
      :param bpmn_graph: an instance of BpmnDiagramGraph representing BPMN model.