Composition in the form of information, there are many, such as text, images, video, etc., and is currently the main carrier of information in text form, for the field of information processing research also focused on the text message, and therefore, information filtering, also known as text filtering. Information filtering concept was first proposed in 1982, aims to broaden the scope of the discussion of information collected [1]. Refers to the text representation on the model can be measured and a mathematical calculation of a structure represented by the natural language text composed of unstructured. Commonly used text representation model has a Boolean model, probabilistic model and vector space model.
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