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    • 21. 发明授权
    • Simple approach to case-based reasoning for data navigation tasks
    • 用于数据导航任务的基于案例推理的简单方法
    • US5717835A
    • 1998-02-10
    • US371182
    • 1995-01-11
    • Joseph Hellerstein
    • Joseph Hellerstein
    • G06F9/44G06F17/30G06N5/02G06N5/04G06F17/00
    • G06N5/02
    • An architecture and key algorithms are presented that simplify the implementation and improve the functionality of knowledge-based systems that employ case-based reasoning for data navigation tasks (e.g., solving help desk problems using a database of past problem instances). The various embodiments of the invention improve on the state-of-the-art in several respects: (a) provides greatly increased flexibility in choosing attributes relevant to a case in that choices are made dynamically at case acquisition instead of statically when the knowledge-based system is designed; (b) increased system flexibility and decreased system complexity by not requiring designers to specify the manner in which attribute values are compared; (c) simplified system design by avoiding the use of similarity metrics; (d) allows for the incremental acquisition of data in problem instances, instead of requiring that all potentially relevant data be collected; and (e) provides a way to explain why a problem solution was chosen. Case acquisition is accomplished by having end-users replay the steps taken to solve a problem instance. Each such step constitutes a navigation element that consists of: (i) a test expressing the conditions under which the navigation is done; (ii) a text description explaining the step; and (iii) a database query expressing the next navigation. Algorithms are presented for case acquisition, case retrieval, and case removal. The case repository is structured as a graph of navigation elements that, under appropriate circumstances, combines into a single node those navigation elements common to multiple cases.
    • 提出了一种架构和关键算法,其简化了实现和改进基于知识的系统的功能,该系统使用基于案例的推理数据导航任务(例如,使用过去问题实例的数据库来解决帮助台问题)。 本发明的各种实施例在几个方面改进了最先进的技术:(a)在选择与案例相关的属性方面提供了极大增加的灵活性,因为在获取案件时动态地进行选择,而不是静态地进行选择, 基于系统设计; (b)通过不要求设计者指定属性值进行比较的方式,增加系统灵活性并降低系统复杂性; (c)通过避免使用相似性度量来简化系统设计; (d)允许在问题实例中增量采集数据,而不是要求收集所有潜在的相关数据; 和(e)提供了一种解释为什么选择问题解决方案的方法。 案例获取是通过让最终用户重播解决问题实例所采取的步骤来实现的。 每个这样的步骤构成导航元件,其包括:(i)表示导航完成的条件的测试; (ii)解释步骤的文字说明; 和(iii)表示下一个导航的数据库查询。 提供算法用于案例获取,案例检索和案例删除。 案件存储库被构造为导航元素的图形,在适当的情况下,将多个情况通用的导航元素组合成单个节点。