The question answering system
The question answering (QA) system is a one hot topic related to IR, IE, NLP, data mining, and so on. A QA system mines a large set of texts to find a short phrase or sentence that answers a user's question with a certain precision. If the source is the Web or, even further, the whole information world, the challenge of the QA system increases dramatically.
There are basically three kinds of QA systems: slot filling, for which the format of the query and answer are similar; limited domain, for which the domains are limited with dictionaries and ontologies; and open domain, for which there is no limitation of domains.
One of the conceptual architectures among various solutions is illustrated in the following image. The ...
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