1. A computer-implemented method comprising: calculating, by a computing system, raw scores for a plurality of media items based on a classifier model and a target concept; ranking, by the computing system, the plurality of media items based on the raw scores; determining, by the computing system, a review set of the plurality of media items, the review set comprising a subset of the plurality of media items; associating, by the computing system, each of the media items of the review set with a content depiction determination, wherein the content depiction determination is indicative of whether a media item depicts the target concept; and calculating, by the computing system, a normalized score formula based on the raw scores and the content depiction determinations for the media items of the review set.
2. The computer-implemented method of claim 1 , wherein the review set is determined based on a sampling rate.