IIR Chapter 9
Query Refinement
--Local: Rocchio algorithm (relevance feedback: the optimal query is the vector difference between the centroids of the relevant and nonrelevant documents); Probabilistic relevance feedback (Naive Bayes probabilistic model); when to work (make query close to document; relevant documents are clustered); Pseudo relevance feedback (assume top k are relevant w/o interaction); indirect relevance feedback (DirectHit).
--Global: vocabulary tools; query expansion (by thesaurus (automatic generated by exploiting word concurrence and grammatical analysis)).
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