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arXiv 1608.06408cs.LG
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利用Top-k反馈进行排名的在线学习

Online Learning to Rank with Top-k Feedback

University of Michigan(密歇根大学)

Sougata Chaudhuri, Ambuj Tewari

摘要:

我们考虑两种设置的在线学习排名反馈限制在排名靠前的项目。该问题被转换为学习者和用户序列之间的在线游戏,经过$T$回合。在这两种设置中,学习者的目标是向用户呈现项目的排名列表。学习者的表现是根据整个排名列表和项目的真实相关性来判断的。然而,学习者在每轮结束时接收高度受限的反馈,其形式为仅最高$k$排名的项目的相关性,其中$k \ll m$。第一个设置是\emph{non-contextual},其中要排名的项目列表是固定的。第二个设置是\emph{contextual},其中项目列表以传统查询文档列表的形式变化。没有对项目和语境的相关性的生成过程进行随机假设。我们为这两种设置提供了有效的排名策略。策略实现$O(T^{2/3})$遗憾,其中遗憾是基于流行的排名措施在第一设置和排名代理人在第二设置。我们还提供了不可能的结果,某些排名措施和一定类别的代理人,当反馈仅限于排名靠前的项目,即$k=1$。我们经验证明我们的算法在模拟和真实世界的数据集上的性能。

英文摘要:

We consider two settings of online learning to rank where feedback is restricted to top ranked items. The problem is cast as an online game between a learner and sequence of users, over $T$ rounds. In both settings, the learners objective is to present ranked list of items to the users. The learner's performance is judged on the entire ranked list and true relevances of the items. However, the learner receives highly restricted feedback at end of each round, in form of relevances of only the top $k$ ranked items, where $k \ll m$. The first setting is \emph{non-contextual}, where the list of items to be ranked is fixed. The second setting is \emph{contextual}, where lists of items vary, in form of traditional query-document lists. No stochastic assumption is made on the generation process of relevances of items and contexts. We provide efficient ranking strategies for both the settings. The strategies achieve $O(T^{2/3})$ regret, where regret is based on popular ranking measures in first setting and ranking surrogates in second setting. We also provide impossibility results for certain ranking measures and a certain class of surrogates, when feedback is restricted to the top ranked item, i.e. $k=1$. We empirically demonstrate the performance of our algorithms on simulated and real world datasets.

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