Synonyms
Intent-aware ERR; Intent-aware expected reciprocal rank
Definition
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 ERRi, ERR-IA is given by
The per-intent ERR is computed as follows. For a particular intent, let Pr(r) denote the probability that the user is satisfied with a document at rank r. For example, we can assume that Pr(r) = 0 if the document at r is nonrelevant to the intent; if we have partially relevant, relevant, and highly relevant documents for the intent (i.e., three relevance levels), we may let Pr(r) be (21 − 1)∕23=...
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Sakai, T. (2018). ERR-IA. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_80618
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DOI: https://doi.org/10.1007/978-1-4614-8265-9_80618
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Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4614-8266-6
Online ISBN: 978-1-4614-8265-9
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