Then, via building a Measure function to represent gap between forecast-rainfall and actual-rainfall. Eventually, to take minimum of the sum of distance as evaluation function.
而后，创建了一种距离函数来表征预测与实际降雨量之间的差距，最后用距离和的最小作为评价函数。
GNP USES node coordinates and distance function to calculate network distance, not to measure distance with a lot of communications traffic.
GNP利用节点坐标和距离函数来计算网络距离，不会为了测量距离附带产生很多的通信流量，在优化性能上是一种轻量级的算法机制。
Mean distance in graphs was very important in analysing function of network. It serves as a measure of efficiency of a heavily used network.
图的平均距离在网络的性能分析中很重要，是度量整个互联网络通信效率的重要参数。
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