Web Information retrieval (Web IR)

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Presentation transcript:

Web Information retrieval (Web IR) Handout #8:Probabilistic information retrieval Ali Mohammad Zareh Bidoki ECE Department, Yazd University alizareh@yaduni.ac.ir Autumn 2011

Outline R(q,d)= P(d,|q) Autumn 2011

Okapi BM25 Algorithm f(qi,D) is the occurrences of qi in the document D f(qi;Q) is the occurrences of qi in the query Q |D| is the length of the document D (i.e., the number of words), and avgdl is the average document length k1, k3 and b are free parameters. Usually set k1 = 2.5, k3 = 0 and b = 0.8. Autumn 2011

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