代码具体实现了simerank的算法实现，适用于小规模的图中计算，大规模的则需要使用分布式算法，第一个算法是基础实现，第二个是使用了平方缓存，加速了算法的收敛速度。(The code realizes the implementation of the algorithm of simerank, which is suitable for computing in small scale. The large scale needs to use distributed algorithm. The first one is the basic realization and the second is the use of square caching to accelerate the convergence speed of the algorithm.)