/// <summary>
/// 计算下一轮PageRank
/// </summary>
public void NextCircle()
{
_mapReduce = new MapReduce <T>();
}
/// <summary>
///
/// </summary>
/// <param name="totalCount">项目总数</param>
/// <param name="stayProbability">保持留在某个项目, 不跳转的概率</param>
public PageRank(int totalCount, double stayProbability = 0.8)
{
_mapReduce = new MapReduce <T>();
_stayProbability = stayProbability;
_averageRank = 1.0 / totalCount;
}