CNEQ: Incorporating numbers into Knowledge Graph Reasoning

摘要

Complex logical reasoning over knowledge graphs lies at the heart of many semantic downstream applications and thus has been extensively explored in recent years. However, nearly all of them overlook the rich semantics of numerical entities (e.g., magnitude, unit, and distribution) and are simply treated as common entities, or even directly removed. It may severely hinder the performance of answering queries involving numerical comparison or numerical computation. To address this issue, we propose the Complex Number and Entity Query model (CNEQ), which comprises a Number-Entity Predictor and an Entity Filter. The Number-Entity Predictor can independently learn the structural and semantic features of entities and numerical values, thereby enabling better prediction of entities as well as numerical values. The Entity Filter can compare or calculate numerical values to filter out entities that meet certain numerical constraints. To evaluate our model, we generated a variety of multi-hop complex logical queries including numerical values on three widely-used Knowledge Graphs: FB15K, DB15K, and YAGO15K. Experimental results demonstrate that CNEQ achieves state-of-the-art results.