import { BaseEstimator } from '../base';
import { Params } from '../base/estimator';
import { Distance } from '../metrics';
export type NeighborsAlgorithm = 'auto' | 'ballTree' | 'kdTree' | 'brute';
export interface NearestNeighborsProps {
    nNeighbors?: number;
    radius?: number;
    algorithm?: NeighborsAlgorithm;
    leafSize?: number;
    metric?: Distance.IDistanceType;
    p?: number;
}
/** Unsupervised nearest-neighbor search over the existing KDTree/BallTree primitives. */
export declare class NearestNeighbors extends BaseEstimator {
    private nNeighbors;
    private radius;
    private algorithm;
    private leafSize;
    private metric;
    private p;
    private trainingState;
    private nFeaturesState;
    constructor(props?: NearestNeighborsProps);
    getParams(): Params;
    fit(X: number[][]): void;
    private validateQueries;
    private resolvedAlgorithm;
    private query;
    kneighbors(X?: number[][], nNeighbors?: number, returnDistance?: boolean): number[][] | {
        distances: number[][];
        indices: number[][];
    };
    radiusNeighbors(X?: number[][], radius?: number, returnDistance?: boolean, sortResults?: boolean): number[][] | {
        distances: number[][];
        indices: number[][];
    };
}