- 皮尔逊相关系数[r=frac{operatorname{Cov}left(operatorname{sim}_{o u t}, operatorname{sim}_{ ext {label}} ight)}{sqrt{operatorname{Var}left(operatorname{sim}_{ ext {out}} ight) operatorname{Var}left( ext {sim}_{ ext {label}} ight)}} ]
表示预测结果和真实结果的相关性，取值范围为[-1,1],越接近1说明相关性越强；作为衡量预测结果的一种评价指标