Entities as Retrieval Signals: A Systematic Study of Coverage, Supervision, and Evaluation in Entity-Oriented Ranking
实体作为检索信号：面向实体导向排序的系统研究
AI总结 研究探讨了实体导向排序中覆盖、监督与评估的系统性问题，发现实体通道限制导致覆盖与区分度难以兼得，强调需改进评估方法以区分条件与开放世界场景。
Comments v2: Corrects RelCov@20 in Table 6 (previously approximated from entity document frequencies; now computed exactly at document level). Reframes the evaluation axis as leaked vs. clean entity supervision rather than document-pool restriction. Adds discussion of Boudens et al. (SIGIR 2026), linking density statistics, and an OER-oracle diagnostic
