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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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This paper investigates temporal and weather-related variation in taxi trips in New York City. A taxi trip data-set with 147 million records covering 10 months of activity is used. It is shown that there are substantial variations in ridership, taxi supply, trip distance, and pickup frequency for different time periods and weather conditions. These variations, in turn, cause variations in driver revenues which is one of the main measures of taxi supply-demand equilibrium. The findings are then used to discuss the anticipated impacts of two recently enacted taxi regulation changes: the first fare increase since 2006 and the E-Hail pilot program which allows taxi hailing with smart phone applications. The fare increase is estimated to cause varying levels of revenue increase for different time periods. E-Hail apps are not expected to offer considerable improvements at all times, but rather when both adequate taxi supply and demand occur simultaneously.

Background:Neonates often develop thrombocytopenia at some time during hospital stay. Platelet transfusion are frequently given to them and are likely to result in unnecessary transfusion.Material and Methods:Thus, we analyzed thrombocytopenia in neonates, its prevalence, and relationship if any, between clinical condition and platelet transfusion in neonates, which would have been helpful in developing guidelines and/or protocols for platelet transfusion (and reducing the donor exposure) in neonates.Results:A total of 870 neonates who were admitted in Neonatal Intensive Care Unit (NICU) with various morbidities had platelets count done; of these, 146 (16.7%) neonate revealed thrombocytopenia.Discussion:Low birth weight babies (P 0.009) and babies born with mother having hypertension (P 0.04) showed significant thrombocytopenia. Neonates with intrauterine growth retardation (IUGR) diagnosed during antenatal screening showed lower platelet count (P 0.022). Neonates having associated illness, such as sepsis, gastrointestinal, and respiratory problems, and on vasopressor drugs were found to be associated with low platelet count.Conclusion:In our study, 16.40% of thrombocytopenic neonates required platelet transfusion either alone or with other blood component during their stay in NICU.

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