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Contextualized PACRR for Complex Answer Retrieval

In this work, we present our submission to the TREC Complex Answer Retrieval (CAR) task. Our approach uses a variation of the Position-Aware Convolutional Recurrent Relevance Matching (PACRR) [2] deep neural model to re-rank passages. Modifications include an expanded convolutional kernel size, and contextual vectors to capture heading type (e.g. title), heading frequency, and query term occurrence frequency. We submitted three runs for human relevance judgments by TREC varying which contextual vectors are included, and the number of negative samples used when training. Our approach yields a MAP of 0.241, R-Prec of 0.321, and MRR of 0.520 when using the term occurrence frequency run in the lenient evaluation environment.