import { TransformerBase } from '../base';
import { Params } from '../base/estimator';
import { CSRMatrix, NumericMatrix } from '../data';
export type FeatureDictionary = Record<string, number | string>;
export interface DictVectorizerProps {
    sparse?: boolean;
    sort?: boolean;
    separator?: string;
}
export declare class DictVectorizer extends TransformerBase<any, any> {
    private sparse;
    private sort;
    private separator;
    private vocabularyState;
    constructor(props?: DictVectorizerProps);
    getParams(): Params;
    private entries;
    fit(X: FeatureDictionary[]): void;
    transform(X: FeatureDictionary[]): CSRMatrix | number[][];
    inverseTransform(X: NumericMatrix): Array<Record<string, number>>;
    restrict(features: number[] | boolean[], support?: boolean): this;
    getFeatureNamesOut(): string[];
    get vocabulary(): ReadonlyMap<string, number>;
}