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Lecture 3: Pivoted Document Length Normalization   
摘  要:   In this lecture, we examine the impact of the length of a document on its relevance to queries. We show that document relevance is positively correlated with document length, and see that relevance scores that use the normalization techniques we’ve studied so far (L∞, L1, L2) do not capture this correlation correctly. Finally, we present the “pivoted document length normalization ” technique introduced by Singhal et al. in [SBM96], which addresses this issue. 1
发  表:   2010

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