Extended approach one: the hierarchical reduction approach of RST to incomplete information system. This approach represents knowledge with complete and incomplete attributes layers, and then conduct reduction hierarchically at each layer.
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- 拓展算法一:不完備信息系統的粗糙集分層遞階約簡(jiǎn)算法將屬性分為完備屬性層和不完備屬性層,然后分層遞階約簡(jiǎn)。