中文说明：
该代码是计算节点介数，分析网络的个体的重要性。简单地讲，一个节点的Betweenness表示所有的节点对之间通过该节点的最短路径条数。Betweenness很好地描述了一个网络中节点可能需要承载的流量。
English Description：
The code is to calculate the node betweenness and analyze the importance of the individual network. In short, the betweenness of a node represents the number of shortest paths between all pairs of nodes passing through the node. Betweenness well describes the traffic that nodes in a network may need to carry.