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GDQA: Graph Driven Question Answering System - NTCIR-4 QAC2 Experiments

This paper is a detailed presentation of a question answering system developed for NTCIR-4. Our question answering system, GDQA, employs both a new text retrieval algorithm that is specialized for QA and a new algorithm for sorting the answer candidates. Using our new algorithm for text retrieval, articles containing the answer for the question can be retrieved with high precision. Our algorithm for sorting answer candidates uses a graphic structure based on the result of the dependency analysis of retrieved articles. Using this sorting algorithm, GDQA can present the correct answer in a higher rank than other candidates.