inverse covariance的用法和样例：
例句
- A new covariance matrix estimator is developed, and a formula for fast estimation of regularization parameters is derived.
发展了一种新的协方差矩阵估计器，导出了一个快速估计正则化参数的公式。 - Covariance analysis was used to analyze herbicide efficacy data from rapeseed experiments.
摘要采用协方差分析方法，对油菜田除草剂的试验结果进行了分析。
