export interface KMeansPlusPlusResult {
    centers: number[][];
    indices: number[];
}
/**
 * Initialize cluster centers according to the kmeans++ strategy.
 * @param X samples matrix
 * @param n_clusters number of clusters
 * @param sampleWeight weights for each sample
 * @param randomState optional random generator
 * @returns selected centers and their indices
 */
export declare function kmeansPlusPlus(X: number[][], n_clusters: number, sampleWeight?: number[], randomState?: () => number): KMeansPlusPlusResult;