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。
In this algorithm, Y-conditional cloud generator is used as the cross operator, and basic cloud generator as the mutation operator.
该算法由正态云模型的Y条件云发生器实现交叉操作，由基本云发生器实现变异操作。
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