In fact, the traditional speedup model is a special case of the node-oriented one. 事实上，传统的加速比模型是面向结点加速比模型的一个特例。
A lot of computation researches indicate that at most of time the effect of model parameters on the computed results is larger than that of the model itself. 大量计算研究表明，许多时候模型参数变化对计算结果的影响比模型本身的影响还要大。
