Knowledge Base Completion for Long-Tail Entities
Lihu Chen Simon Razniewski Gerhard Weikum
Despite their impressive scale, knowledge bases (KBs), such as Wikidata,
still contain significant gaps. Language models (LMs) have been proposed as a
source for filling these gaps. However, prior works have focused on prominent
entities with rich coverage by LMs, neglecting the crucial case of long-tail
entities. In this paper, we present a novel method for LM-based-KB completion
that is specifically geared for facts about long-tail entities. The method
leverages two different LMs in two stages: for candidate retrieval and for
candidate verification and disambiguation. To evaluate our method and various
baselines, we introduce a novel dataset, called MALT, rooted in Wikidata. Our
method outperforms all baselines in F1, with major gains especially in recall.