The Classic Model for Information Retrieval Information retrieval (IR) can be understood as the task of finding material (usually documents) of an unstructured nature (usually text), which satisfies information need from within large collections (usually stored on computers). Formal retrieval models have formed the basis of IR research. Since early 1960s, a number of different models have been developed to describe aspects of the retrieval task: document content and structure, inter-document linkage, queries, users, their information needs and the context in which the retrieval task is embedded. The reliability on formal retrieval models is one of the great strengths of IR research [1,2,3, 4]. While using an IR system, a user, driven by an information need, constructs a query in some query language. The query is then submitted to a system that selects from a collection of documents (corpus), those documents which match the query as ind
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