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Introduction to Information Retrieval

Online edition (c) 2009 Cambridge UPDRAFT! April 1, 2009 Cambridge University Press. Feedback classification and NaiveBayesThus far, this book has mainly discussed the process ofad hoc Retrieval , whereusers have transient Information needs that they try to address by posingone or more queries to a search engine. However, many users have ongoinginformation needs. For example, you might need to track developments inmulticore computer chips. One way of doing this is to issue the querymulti-coreANDcomputerANDchipagainst an index of recent newswire articles eachmorning. In this and the following two chapters we examine the question:How can this repetitive task be automated? To this end, many systems sup-portstanding queries. A standing query is like any other query except that itS TANDI NG Q UERYis periodically executed on a collection to which new documents are incre-mentally added over your standing query is justmulticoreANDcomputerANDchip, you will tendto miss many relevant new articles which use other terms suchasmulticoreprocessors.

Apr 01, 2009 · We begin this chapter with a general introduction to the text classification problem including a formal definition (Section 13.1); we then cover Naive Bayes, aparticularlysimple andeffectiveclassification method (Sections 13.2– 13.4). All of the classification algorithms we study represent documents in high-dimensional spaces.

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