import { int } from '../randUtils';
import { Serialize } from '../simpleSerializer';
export declare type ImpurityMeasure = 'gini' | 'entropy' | 'squared_error';
export declare function giniCoefficient(labelFreqs: int[], nSamples: int): number;
export declare function entropy(labelFreqs: int[], nSamples: int): number;
export declare function mse(ySquaredSum: number, ySum: number, nSamples: int): number;
export declare class ClassificationCriterion extends Serialize {
    y: int[];
    impurityMeasure: ImpurityMeasure;
    start: int;
    end: int;
    pos: int;
    nLabels: int;
    labelFreqsTotal: int[];
    labelFreqsLeft: int[];
    labelFreqsRight: int[];
    nSamples: int;
    nSamplesLeft: int;
    nSamplesRight: int;
    name: string;
    constructor({ impurityMeasure, y }: {
        impurityMeasure: ImpurityMeasure;
        y: number[];
    });
    init(start: int, end: int, sampleMap: Int32Array): void;
    reset(): void;
    update(newPos: int, sampleMap: Int32Array): void;
    childrenImpurities(): {
        impurityLeft: number;
        impurityRight: number;
    };
    impurityImprovement(): number;
    nodeImpurity(): number;
    nodeValue(): number[];
    static fromJson(model: string): any;
}
export declare class RegressionCriterion extends Serialize {
    y: number[];
    impurityMeasure: 'squared_error';
    start: int;
    end: int;
    pos: int;
    squaredSum: number;
    squaredSumLeft: number;
    squaredSumRight: number;
    sumTotal: number;
    sumTotalLeft: number;
    sumTotalRight: number;
    nSamples: int;
    nSamplesLeft: int;
    nSamplesRight: int;
    name: string;
    constructor({ impurityMeasure, y }: {
        impurityMeasure: 'squared_error';
        y: number[];
    });
    init(start: int, end: int, sampleMap: Int32Array): void;
    reset(): void;
    update(newPos: int, sampleMap: Int32Array): void;
    childrenImpurities(): {
        impurityLeft: number;
        impurityRight: number;
    };
    impurityImprovement(): number;
    nodeImpurity(): number;
    nodeValue(): number[];
    static fromJson(model: string): any;
}