Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu


  • Tetsuya SakaiEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_80618


Intent-aware ERR; Intent-aware expected reciprocal rank


ERR-IA, an intent-aware version of expected reciprocal rank (ERR), is an evaluation measure for diversified search. In diversified search evaluation, it is assumed that a topic q has multiple possible intents { i} and that intent probabilities Pr( i| q) and per-intent relevance assessments are available. Given the ERR score computed for each intent, denoted by ERR i, ERR-IA is given by
$$ \displaystyle \begin{aligned} \mathrm {ERR}\mbox{-}\mathrm {IA}=\sum\limits_{i} \mathit{Pr}(i|q)\mathrm {ERR}_{i}. \end{aligned} $$
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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Waseda UniversityTokyoJapan