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BACKGROUND

In many Software applications, statistical classifiers are used to predict potential outputs. A statistical classifier assigns a probability distribution on all potential outputs. The system can select the top in outputs with highest probabilities. This is called n-best selection method, which has been used in speech recognition, natural language understanding, machine translation and other applications. Traditionally n is a fixed number.

Dialog systems are systems in which a person speaks or otherwise enters input to a computer in natural language, in order to accomplish a result. With the rise of microprocessor controlled appliances and equipment, dialog systems are increasingly used to facilitate the man-machine interface in many applications such as computers, automobiles, home appliances, phone-based customer service, and so on. Dialog systems process the query and access one or more databases …