A Semantic Expansion-Based Joint Model for Answer Ranking in Chinese Question Answering Systems

摘要

Answer ranking is one of essential steps in open domain question answering systems. The ranking of the retrieved answers directly affects user satisfaction. This paper proposes a new joint model for answer ranking by leveraging context semantic features, which balances both question-answer similarities and answer ranking scores. A publicly available dataset containing 40,000 Chinese questions and 369,919 corresponding answer passages from Sogou Lab is used for experiments. Evaluation on the joint model shows a Precison@l of 72.6%, which outperforms the state-of-the-art baseline methods.