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arXiv 1604.04403cs.GTcs.AIcs.CCcs.DScs.MA
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树上单峰偏好的诱导

Elicitation for Preferences Single Peaked on Trees

Indian Institute of Science(印度科学学院);Indian Institute of Technology, Gandhinagar(印度理工学院甘地纳加尔分校)

Palash Dey, Neeldhara Misra

摘要:

在多智能体系统中,我们经常有一组代理,其中每个代理都有一个偏好排序的一组项目和一个想知道这些偏好排序的各种任务,例如,数据分析,偏好聚合,投票等,但是,我们往往有大量的项目,这使得它不切实际的要求他们完整的偏好排序的代理。在这种情况下,我们通常通过询问(希望是少量的)比较查询来引出这些代理的偏好-要求代理比较两个项目。以往的偏好提取工作主要集中在非限制域和单峰偏好域上,并表明单峰域中的偏好可以通过比非限制域少得多的查询次数来提取。我们延长这条线的研究和研究的单峰偏好树,这是一个严格的超集的单峰偏好域的偏好启发。我们发现,查询的复杂性关键取决于叶子的数量,路径覆盖数,以及从路径的基本单峰树的距离,而其他自然参数,如最大程度,直径,路径宽度不发挥任何直接的作用,在确定查询的复杂性。然后,我们调查的查询复杂性,找到一个弱孔多塞优胜者的偏好单峰的树,并表明,这项任务的查询复杂性比偏好启发少得多。在这里,我们再次观察到,在潜在的单峰树和树的路径覆盖数的叶子的数量影响问题的查询复杂度。

英文摘要:

In multiagent systems, we often have a set of agents each of which have a preference ordering over a set of items and one would like to know these preference orderings for various tasks, for example, data analysis, preference aggregation, voting etc. However, we often have a large number of items which makes it impractical to ask the agents for their complete preference ordering. In such scenarios, we usually elicit these agents' preferences by asking (a hopefully small number of) comparison queries --- asking an agent to compare two items. Prior works on preference elicitation focus on unrestricted domain and the domain of single peaked preferences and show that the preferences in single peaked domain can be elicited by much less number of queries compared to unrestricted domain. We extend this line of research and study preference elicitation for single peaked preferences on trees which is a strict superset of the domain of single peaked preferences. We show that the query complexity crucially depends on the number of leaves, the path cover number, and the distance from path of the underlying single peaked tree, whereas the other natural parameters like maximum degree, diameter, pathwidth do not play any direct role in determining query complexity. We then investigate the query complexity for finding a weak Condorcet winner for preferences single peaked on a tree and show that this task has much less query complexity than preference elicitation. Here again we observe that the number of leaves in the underlying single peaked tree and the path cover number of the tree influence the query complexity of the problem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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