英语语法分析

Range reduct based on variable precision rough set model;

变精度粗集模型是一种有参数的粗集扩充模型。

To consistent decision tables, the minimal reduct has been proved to be NP-hard.

最优属性约简是NP困难问题，目前出现的启发式算法多是以决策表的核为起点。

Reduct calculation is the key issue of the research of rough set based data mining.

简约的计算是基于粗糙集理论的数据采掘研究的关键问题。