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COPR: Consistency-Oriented Pre-Ranking for Online Advertising

Published: 21 October 2023 Publication History

Abstract

Cascading architecture has been widely adopted in large-scale advertising systems to balance efficiency and effectiveness. In this architecture, the pre-ranking model is expected to be a lightweight approximation of the ranking model, which handles more candidates with strict latency requirements. Due to the gap in model capacity, the pre-ranking and ranking models usually generate inconsistent ranked results, thus hurting the overall system effectiveness. The paradigm of score alignment is proposed to regularize their raw scores to be consistent. However, it suffers from inevitable alignment errors and error amplification by bids when applied in online advertising. To this end, we introduce a consistency-oriented pre-ranking framework for online advertising, which employs a chunk-based sampling module and a plug-and-play rank alignment module to explicitly optimize consistency of ECPM-ranked results. A ΔNDCG-based weighting mechanism is adopted to better distinguish the importance of inter-chunk samples in optimization. Both online and offline experiments have validated the superiority of our framework. When deployed in Taobao display advertising system, it achieves an improvement of up to +12.3% CTR and +5.6% RPM.

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    cover image ACM Conferences
    CIKM '23: Proceedings of the 32nd ACM International Conference on Information and Knowledge Management
    October 2023
    5508 pages
    ISBN:9798400701245
    DOI:10.1145/3583780
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    Published: 21 October 2023

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    Author Tags

    1. cascading architecture
    2. consistency
    3. pre-ranking

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