2022

TIARA: Multi-grained Retrieval for Robust Question Answering over Large Knowledge Bases

Shu, Yiheng, Yu, Zhiwei, Li, Yuhan et al.

Understand

Pre-trained language models (PLMs) have shown their effectiveness in multiple scenarios.

  • However, KBQA remains challenging, especially regarding coverage and generalization settings.
  • This is due to two main factors: i) understanding the semantics of both questions and relevant knowledge from the KB; ii) generating executable logical forms with both semantic and syntactic correctness.
  • In this paper, we present a new KBQA model, TIARA, which addresses those issues by applying multi-grained retrieval to help the PLM focus on the most relevant KB contexts, viz., entities, exemplary logical forms, and schema items.

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