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probabilistic or weighted indexing

Weighted indexing designed in order to decrease semantic noises in information retrieval. Therefore, when indexing, a suitable weigh should be assigned for any keyword in accordance with the rate of its relevance with document’s content. Additionally, probabilistic indexing implies that the probable relevance of a document to a given request can be computed and that the output of the search can be presented to the user in a ranked order of probable relevance rather than in a random order.