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Key:

• Increases ["Recall"]

• Not necessary for many queries and are generally of marginal use.

Using information about the relevance of results from previous searches to modify current queries is a form of RelevanceFeedback.

Types?

• Reweighting without Query expansion - This is where we reweight the terms
• Query expansion without reweightng - Ideally, query expansion should be done using a thesaurus that adds sysnonyms.
• Query expansion with reweighting

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