本程序是稀疏矩阵(三列)的SIS模型，用于上万个节点的大型网络。因为传统的算法是基于邻接矩阵，对于大型网络并不适用。-This procedure is sparse (three) of the SIS model for large-scale network of tens of thousands of nodes. Because the traditional algorithm is based on adjacency matrix, does not apply to large networks.