The ascertainment of the core attribute set is the important process for discovering decision rules from mass data.
核属性集的确定是从海量数据中发现决策规则的重要步骤。
The ascertainment of the core attribute set of large database is an important process of generating the classifying rules.
大型数据库中核属性集的确定是生成分类规则算法的重要步骤。
Knowledge reduction is the core of Rough set. It obtains the reduction attribute and classification rules while holding the ability of classification unchanged.
知识约简是其中的核心内容，是在保持分类能力基本不变的情况下，获得系统的约简属性和分类规则。
Acquiring optimal relative reduction by descending approach to core of attribute from original set of conditional attribute and combining with operator.
以原始条件属性集为起点并结合算子，通过向属性核的递减式逼近，得到属性的最小相对约简。
Attribute reduction is one of the core issues of the rough set theory and it has become a hot topic of the rough set theory research.
属性约简是粗糙集理论的一个核心问题，近年来已经成为粗集研究的热点。
Attribute reduction is one of the key problems in rough set theory, and determination of core attribute is the basis to solve the problem of attribute reduction.
属性约简是粗糙集理论研究的一个核心问题，而核属性的确定往往是决策表中属性约简的基础。
Attribute reduction is one of the key problems in rough set theory, and determination of core attribute is the basis to solve the problem of attribute reduction.
属性约简是粗糙集理论研究的一个核心问题，而核属性的确定往往是决策表中属性约简的基础。
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