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arXiv 2006.08421cs.NI
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缓存网络中联合缓存和推荐的近似算法

An approximation algorithm for joint caching and recommendations in cache networks

Dimitra Tsigkari, Thrasyvoulos Spyropoulos

摘要:

流媒体平台,如Netflix和YouTube,努力在比特率、延迟等方面提供高流媒体质量(SQ),to their其users用户.与此同时,这些平台的内容消费中有很大一部分受到推荐的影响。在该设置中,用户的整体体验是用户对推荐内容的兴趣,即,推荐质量(RQ)和该内容的SQ。然而,影响SQ的网络决策(如缓存)通常是在不考虑推荐者行为的情况下做出的。同样,建议的选择与潜在的交付质量无关。在本文中,我们定义了一个度量流体验(MoSE),捕捉SQ和RQ之间的基本权衡。我们的目标是共同优化缓存和建议在一个通用的网络缓存,最大限度地提高这一指标的目标。这与内容提供方同时充当内容分发网络所有者的最近趋势一致,这意味着同一实体可以处理缓存和推荐决策。我们制定这个联合优化问题,并证明它可以近似到一个常数因子。据我们所知,这是第一个多项式算法,以实现一个恒定的近似比的联合问题。此外,我们的数值实验表明,我们的算法的基线计划和现有的算法在文献中的重要性能增益。

英文摘要:

Streaming platforms, like Netflix and YouTube, strive to offer high streaming quality (SQ), in terms of bitrate, delays, etc., to their users. Meanwhile, a significant share of content consumption of these platforms is heavily influenced by recommendations. In this setting, the user's overall experience is a product of both the user's interest in a recommended content, i.e., the recommendation quality (RQ), and the SQ of this content. However, network decisions (like caching) that affect the SQ are usually made without considering the recommender's actions. Likewise, recommendations are chosen independently of the potential delivery quality. In this paper, we define a metric of streaming experience (MoSE) that captures the fundamental tradeoff between the SQ and RQ. We aim to jointly optimize caching and recommendations in a generic network of caches, with the objective of maximizing this metric. This is in line with the recent trend for content providers to simultaneously act as Content Delivery Network owners, implying that the same entity may handle both caching and recommendation decisions. We formulate this joint optimization problem and prove that it can be approximated up to a constant factor. To the best of our knowledge, this is the first polynomial algorithm to achieve a constant approximation ratio for the joint problem. Moreover, our numerical experiments show important performance gains of our algorithm over baseline schemes and existing algorithms in the literature.

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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