Hema Raghavan

Hema Raghavan

Mountain View, California, United States
7K followers 500+ connections

About

15+ years of industry experience in Search, Advertising and Recommendations. My strength…

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  • Kumo.AI Graphic

    Kumo.AI

    Mountain View, CA

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    Mountain View, California, United States

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    Mountain View, California

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    Mountain View, CA

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    Mountain View, Ca

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Education

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Publications

  • Learning to Rank for Robust Question Answering

    ACM International Conference on Information and Knowledge Management (CIKM)

    This paper aims to solve the problem of improving the ranking of answer candidates for factoid based questions in a state-of-the-art Question Answering system. We first provide an extensive comparison of 5 ranking algorithms on two datasets – from the Jeopardy quiz show and a medical domain. We then show the effectiveness of a cascading approach, where the ranking produced by one ranker is used as input to the next stage. The cascading approach shows sizeable gains on both datasets. We finally…

    This paper aims to solve the problem of improving the ranking of answer candidates for factoid based questions in a state-of-the-art Question Answering system. We first provide an extensive comparison of 5 ranking algorithms on two datasets – from the Jeopardy quiz show and a medical domain. We then show the effectiveness of a cascading approach, where the ranking produced by one ranker is used as input to the next stage. The cascading approach shows sizeable gains on both datasets. We finally evaluate several rank aggregation techniques to combine these algorithms, and find that Supervised Kemeny aggregation is a robust technique that always beats the baseline ranking approach used by Watson for the Jeopardy competition. We further corroborate our results on TREC
    Question Answering datasets.

    See publication

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