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Relevance Feedback

https://en.wikipedia.org/wiki/Relevance_feedback

Relevance feedback is a feature of some information retrieval systems. The idea behind relevance feedback is to take the results that are initially returned from a given query, to gather user feedback, and to use information about whether or not those results are relevant to perform a new query. We can usefully distinguish between three types of feedback: explicit feedback, implicit feedback, and blind or “pseudo” feedback.

§ Explicit feedback

§ Implicit Feedback