arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2402.09176cs.IR
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用于冷启动推荐的大型语言模型模拟器

Large Language Model Simulator for Cold-Start Recommendation

Feiran Huang, Yuanchen Bei, Zhenghang Yang, Junyi Jiang, Hao Chen, Qijie Shen, Senzhang Wang, Fakhri Karray, Philip S. Yu

AI总结:

针对十亿规模推荐系统冷启动物品缺乏历史行为数据的问题,提出LLM Simulator框架并设计耦合漏斗ColdLLM,通过耦合过滤器缩减候选用户规模后利用LLM模拟用户交互,显著提升冷启动推荐效果与GMV。

摘要:

在十亿规模的在线推荐系统中,推荐冷启动物品仍然是一个重大挑战。热启动物品得益于历史用户行为,而冷启动物品仅依赖内容特征,这限制了其推荐性能并影响用户体验与收入。当前模型从内容特征生成合成行为嵌入,但未能解决核心问题:缺乏历史行为数据。为解决此问题,我们引入了LLM Simulator框架,利用大型语言模型模拟冷启动物品的用户交互,从根本上解决冷启动问题。然而,在十亿规模系统中,简单使用LLM遍历所有用户会引入显著复杂性。为管理计算复杂性,我们提出用于在线推荐的耦合漏斗ColdLLM框架。ColdLLM通过训练的耦合过滤器,高效将候选用户数从数十亿缩减至数百,使LLM能在过滤后的集合上高效运行。大量实验表明,ColdLLM在冷启动推荐中显著超越基线,包括Recall和NDCG指标。为期两周的A/B测试也验证了ColdLLM能有效提升冷启动期GMV。

英文摘要:

Recommending cold items remains a significant challenge in billion-scale online recommendation systems. While warm items benefit from historical user behaviors, cold items rely solely on content features, limiting their recommendation performance and impacting user experience and revenue. Current models generate synthetic behavioral embeddings from content features but fail to address the core issue: the absence of historical behavior data. To tackle this, we introduce the LLM Simulator framework, which leverages large language models to simulate user interactions for cold items, fundamentally addressing the cold-start problem. However, simply using LLM to traverse all users can introduce significant complexity in billion-scale systems. To manage the computational complexity, we propose a coupled funnel ColdLLM framework for online recommendation. ColdLLM efficiently reduces the number of candidate users from billions to hundreds using a trained coupled filter, allowing the LLM to operate efficiently and effectively on the filtered set. Extensive experiments show that ColdLLM significantly surpasses baselines in cold-start recommendations, including Recall and NDCG metrics. A two-week A/B test also validates that ColdLLM can effectively increase the cold-start period GMV.

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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