Discussion boards and online forums provide a platform for users to share ideas, discuss issues and communicate with each other. Nowadays most of the discussion boards are used as problem-solving platforms which can be seen as question-answering knowledge bases. Therefore, if system can automatically locate the similar questions which have appeared previously, then the same answers could be returned to users to eliminate the time users wait for. In this paper, a novel question retrieval method is proposed. Keywords based inverted index is chosen as the basis technology, and dependency information, language model, and simple semantic information is used to extend it. Experimental results show the effectiveness and benefits of our approach.
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