import { MatchFunc } from "./MatchFunc";
import { Primitive } from "./Primitive";
/**
  Calculate [Recall@K](https://datascience.stackexchange.com/questions/92247/precisionk-and-recallk)
  Assesses how many relevant items were retrieved in the top-k retrievals, counting only the first match for each relevant item.
  @param relevantItems - List of relevant items
  @param retrievedItems - List of retrieved items
  @param matchFunc - Function to compare items for equality
  @param k - Value of k (top-k results to consider)
  @returns Recall@K
 */
export declare function recallAtK<T extends Primitive>(relevantItems: T[], retrievedItems: T[], matchFunc: MatchFunc<T>, k: number): number;
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