Before we can calculate the final F-score first we must calculate your individual precision and recall. When a player does a cube there are four possible outcomes for every segment in that cube: a true positive result, a false positive result, a false negative result and a true negative result. A true positive (tp) result is when a player adds a segment that should be added. A false positive (fp) is when a player adds a segment that should not be added. A false negative (fn) is when a player misses a segment they should have added. A true negative (tn) is when a player correctly leaves out a segment that does not belong. In the figure below you can see an example of false negative and of false positive.
在计算最终的F分数时,要提前计算好玩家个人的准确率和召回。方块由玩家搭建完后,程序识别并输出4种判断的结果:正确的阳性结果、错误的阳性结果、正确的阴性结果、错误的阴性结果。正确的阳性结果(tp)是你正确添加的小区块个数;错误的阳性结果(fp)是你错误添加了不该有的小区块;正确的阴性结果(tn)是你移除原来模型中错误的小区块;错误的阴性结果(fn)是你遗漏了需要添加的小区块。你可以在下图看到错误的阳性与错误的阴性的区别。