Profiling What Matters: Context-Aware Item Profiles from Large-Scale Metadata for LLM Recommenders

2026-08-21

AI Summary

针对推荐系统中利用物品信息的挑战，提出CAIRO框架，通过结构化元数据和用户上下文生成简洁、相关的物品描述，以提高基于大语言模型的重排序效果。

Abstract

While Large Language Models (LLMs) have significantly advanced reranking in recommendation, effectively leveraging item-side information remains challenging. Real-world items are described by vast, heterogeneous, and unstructured metadata, where decision-relevant signals are often implicit, noisy, or buried in long descriptions. Moreover, feature salience is highly context-dependent, varying not only across items but also across users. Existing methods often rely on item titles, fixed attributes, or static item summaries, which limit personalized and fine-grained item understanding. To bridge this gap, we propose CAIRO, a user context-aware item profiling framework for LLM-based reranking. CAIRO first structures raw metadata and reviews into objective features and subjective traits, and employs a lightweight profiler to select the most relevant information for each user-item pair with limited serving-time overhead. The resulting profiles are concise and context-specific, providing relevant item-side evidence for the LLM's ranking decision. Experiments show that CAIRO consistently improves LLM-based reranking, highlighting the importance of item profiling that effectively exploits vast item-side information.

Problem

• Large Language Models
• item-side information
• metadata
• context-dependent
• personalized

Innovation

• Context-Aware
• Item Profiling
• Large-Scale Metadata
• LLM-based Reranking
• Personalized Item Understanding