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 HOTPOTQA benchmark by 10.59 F1. * Equal contribution. Correspondence to {agodbole, ra-jarshi}@cs.umass.edu 1 According to Yang et al. (2018), the easy (hard) subset primarily requires single (multi) hop reasoning. We only consider queries that have answers as spans in at least one paragraph.Question : What county is Ron Teachworth from? Ronald S. Teachworth is an American artist, writer and film director from Rochester Hills, Michigan.Rochester Hills is a city in northeast Oakland County of the U.S. state of Michigan, in the northern outskirts of Metropolitan Detroit area. As of the 2010 census, the city had a total population of 70,995.
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