arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0901.3754cs.GTcs.DS
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宽匹配广告拍卖中的出价优化

Bid Optimization in Broad-Match Ad auctions

Eyal Even-dar, Yishay Mansour, Vahab Mirrokni, S. Muthukrishnan, Uri Nadav

摘要:

赞助搜索中的广告拍卖支持“广泛匹配”,允许广告客户瞄准大量查询,同时只对有限的数量进行出价。在为广告商提供更多表现力的同时,此功能使优化出价以最大化其回报具有挑战性:选择对查询进行出价作为广泛匹配,因为它提供高利润,而对相关查询的一次出价可能产生低利润甚至负利润。我们抽象和研究的{ \em出价优化问题},这是确定一个广告客户的关键字的子集上的出价(可能使用广泛的匹配),使她的利润最大化的复杂性。在查询语言模型中,当广告商被允许对所有的查询作为广泛的匹配出价时,我们提出了一个基于线性规划(LP)的多项式时间算法,以获得最佳的利润。在广告商只能对关键词出价的模型中,一个子集的关键字作为一个确切的或广泛的匹配,我们表明,这个问题是不可近似的任何合理的近似因子,除非P=NP。为了处理这个困难的结果,当最佳利润显着超过成本时,我们提出了一个常数因子近似。该算法是基于舍入的自然LP制定的问题。最后,我们研究了预算的问题的变体,并表明,在查询语言模型中,可以找到两个预算约束的广告活动在多项式时间,实现最优的投标策略。我们的研究结果是第一个解决出价优化下的广泛匹配功能,这是常见的广告拍卖。

英文摘要:

Ad auctions in sponsored search support ``broad match'' that allows an advertiser to target a large number of queries while bidding only on a limited number. While giving more expressiveness to advertisers, this feature makes it challenging to optimize bids to maximize their returns: choosing to bid on a query as a broad match because it provides high profit results in one bidding for related queries which may yield low or even negative profits. We abstract and study the complexity of the {\em bid optimization problem} which is to determine an advertiser's bids on a subset of keywords (possibly using broad match) so that her profit is maximized. In the query language model when the advertiser is allowed to bid on all queries as broad match, we present an linear programming (LP)-based polynomial-time algorithm that gets the optimal profit. In the model in which an advertiser can only bid on keywords, ie., a subset of keywords as an exact or broad match, we show that this problem is not approximable within any reasonable approximation factor unless P=NP. To deal with this hardness result, we present a constant-factor approximation when the optimal profit significantly exceeds the cost. This algorithm is based on rounding a natural LP formulation of the problem. Finally, we study a budgeted variant of the problem, and show that in the query language model, one can find two budget constrained ad campaigns in polynomial time that implement the optimal bidding strategy. Our results are the first to address bid optimization under the broad match feature which is common in ad auctions.

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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