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arXiv 2108.04468cs.IRcs.AI
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基于点进RatePrediction模型的端到端用户行为检索

End-to-End User Behavior Retrieval in Click-Through RatePrediction Model

Alibaba Group(阿里巴巴集团)

Qiwei Chen, Changhua Pei, Shanshan Lv, Chao Li, Junfeng Ge, Wenwu Ou

摘要:

点击率预测是推荐系统的核心任务之一。它预测每个用户-项目对的个性化点击概率。近年来,研究人员发现,考虑用户行为序列,特别是长期用户行为序列,可以大大提高CTR模型的性能。某电子商务网站的报告显示,23%的用户在过去5个月内的点击量超过1000次。虽然有大量的工作集中在建模连续的用户行为,很少有工作可以处理长期的用户行为序列,由于严格的推理时间限制,在现实世界的系统。提出了两阶段方法来推动极限以获得更好的性能。在第一阶段,设计了一个辅助任务,用于从长期用户行为序列中检索前$k$相似项。在第二阶段,经典注意力机制在候选项目和第一阶段中选择的$k$项目之间进行。然而,在检索阶段和主要的CTR任务之间存在信息差。这种目标偏离会大大降低长期用户序列的性能增益。本文受Reformer的启发,提出了一种局部敏感哈希(LSH)方法ETA(End-to-end Target Attention),该方法可以大大降低训练和推理的代价,使长时间用户行为序列的端到端训练成为可能。离线和在线实验都证实了我们模型的有效性。我们将ETA部署到一个大规模的真实世界的电子商务系统中,并实现了额外的3.1%的GMV(总销售价值)相比,两个阶段的长用户序列CTR模型。

英文摘要:

Click-Through Rate (CTR) prediction is one of the core tasks in recommender systems (RS). It predicts a personalized click probability for each user-item pair. Recently, researchers have found that the performance of CTR model can be improved greatly by taking user behavior sequence into consideration, especially long-term user behavior sequence. The report on an e-commerce website shows that 23\% of users have more than 1000 clicks during the past 5 months. Though there are numerous works focus on modeling sequential user behaviors, few works can handle long-term user behavior sequence due to the strict inference time constraint in real world system. Two-stage methods are proposed to push the limit for better performance. At the first stage, an auxiliary task is designed to retrieve the top-$k$ similar items from long-term user behavior sequence. At the second stage, the classical attention mechanism is conducted between the candidate item and $k$ items selected in the first stage. However, information gap happens between retrieval stage and the main CTR task. This goal divergence can greatly diminishing the performance gain of long-term user sequence. In this paper, inspired by Reformer, we propose a locality-sensitive hashing (LSH) method called ETA (End-to-end Target Attention) which can greatly reduce the training and inference cost and make the end-to-end training with long-term user behavior sequence possible. Both offline and online experiments confirm the effectiveness of our model. We deploy ETA into a large-scale real world E-commerce system and achieve extra 3.1\% improvements on GMV (Gross Merchandise Value) compared to a two-stage long user sequence CTR model.

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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