Zhiyu Gong


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Multi-step Entity-centric Information Retrieval for Multi-Hop Question Answering
Rajarshi Das | Ameya Godbole | Dilip Kavarthapu | Zhiyu Gong | Abhishek Singhal | Mo Yu | Xiaoxiao Guo | Tian Gao | Hamed Zamani | Manzil Zaheer | Andrew McCallum
Proceedings of the 2nd Workshop on Machine Reading for Question Answering

Multi-hop question answering (QA) requires an information retrieval (IR) system that can find multiple supporting evidence needed to answer the question, making the retrieval process very challenging. This paper introduces an IR technique that uses information of entities present in the initially retrieved evidence to learn to ‘hop’ to other relevant evidence. In a setting, with more than 5 million Wikipedia paragraphs, our approach leads to significant boost in retrieval performance. The retrieved evidence also increased the performance of an existing QA model (without any training) on the benchmark by 10.59 F1.