import { ClusterBase } from '../base';
import { Params } from '../base/estimator';
export interface BirchProps {
    threshold?: number;
    branchingFactor?: number;
    nClusters?: number | null;
}
/** Balanced CF-tree with threshold absorption and optional agglomerative global clustering. */
export declare class Birch extends ClusterBase {
    private threshold;
    private branchingFactor;
    private nClusters;
    private rootState?;
    private subclusterCentersState;
    private subclusterLabelsState;
    private nFeaturesState;
    constructor(props?: BirchProps);
    getParams(): Params;
    private center;
    private singleton;
    private aggregate;
    private nearest;
    private tryAbsorb;
    /** Split an overflowing node around its farthest pair; mutate node to the left half and return the right sibling. */
    private split;
    /** Insert one sample, returning a new sibling when this node overflows. */
    private insert;
    private leafSubclusters;
    private finalize;
    partialFit(X: number[][]): this;
    fit(X: number[][]): void;
    predict(X: number[][]): number[];
    fitPredict(X: number[][]): number[];
    get subclusterCenters(): number[][];
    get subclusterLabels(): number[];
}