covariance
n. [数] 协方差;共分散
例句
The distinction between covariance and contravariance is important for computations with tensors, which often have mixed variance.
协变和逆变的区别对于张量的计算尤为重要,这往往会出现混合方差。
Another concept that's very basic here is covariance.
另一个基本的概念是协方差。
Covariance is a measure of how much two variables move together.
协方差衡量的是两个变量一起变动的情况。