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搜索引擎返回结果的好坏如何直接决定了系统的性能。传统的对于搜索引擎的评价标准有查全率和查准率。(1)查全率R(Recall)：又被称为召回率，它是指对于系统的每一次查询，检索出的和查询相关的的文档占全部相关文档的比例，它反映的是搜索引擎能够查询到的信息的全面性。(…

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