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arXiv 2209.08403cs.LGcs.IR
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基于高维Bandits的广告媒体与目标受众优化

Advertising Media and Target Audience Optimization via High-dimensional Bandits

Stanford University(斯坦福大学)

Wenjia Ba, J. Michael Harrison, Harikesh S. Nair

摘要:

我们提出了一个数据驱动的算法,广告商可以使用它来自动化他们的数字广告活动在在线出版商。该算法使广告商能够搜索可用的目标受众和广告媒体,通过在线实验为其活动找到最佳组合。找到最佳受众广告组合的问题因许多独特的挑战而变得复杂,包括(a)需要积极探索以解决先前的不确定性并加速搜索有利可图的组合,(b)许多组合可供选择,从而产生高维搜索公式,以及(c)非常低的成功概率,通常只有百分之一的一小部分。我们的算法(命名为LRDL,是Logistic Regression with Debiased Lasso的首字母缩写)通过结合四个元素来解决这些挑战:用于主动探索的多臂强盗框架;用于处理高维的Lasso惩罚函数;处理Lasso引起的正则化偏差的内置去偏内核;以及用于促进跨臂交叉学习的结果的半参数回归模型。该算法被实现为汤普森采样器,据我们所知,它是第一个可以实际解决上述所有挑战的算法。真实数据和合成数据的仿真结果表明,该方法是有效的,并证明了其优越的性能对最近的高维bandit文献的几个基准。

英文摘要:

We present a data-driven algorithm that advertisers can use to automate their digital ad-campaigns at online publishers. The algorithm enables the advertiser to search across available target audiences and ad-media to find the best possible combination for its campaign via online experimentation. The problem of finding the best audience-ad combination is complicated by a number of distinctive challenges, including (a) a need for active exploration to resolve prior uncertainty and to speed the search for profitable combinations, (b) many combinations to choose from, giving rise to high-dimensional search formulations, and (c) very low success probabilities, typically just a fraction of one percent. Our algorithm (designated LRDL, an acronym for Logistic Regression with Debiased Lasso) addresses these challenges by combining four elements: a multiarmed bandit framework for active exploration; a Lasso penalty function to handle high dimensionality; an inbuilt debiasing kernel that handles the regularization bias induced by the Lasso; and a semi-parametric regression model for outcomes that promotes cross-learning across arms. The algorithm is implemented as a Thompson Sampler, and to the best of our knowledge, it is the first that can practically address all of the challenges above. Simulations with real and synthetic data show the method is effective and document its superior performance against several benchmarks from the recent high-dimensional bandit 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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