export interface BleuOptions {
    maxNgramSize?: number;
    smoothing?: number;
}
export interface BleuResult {
    score: number;
    precisions: number[];
    brevityPenalty: number;
    candidateLength: number;
    referenceLength: number;
}
export declare const calculateBleu: (candidate: string, reference: string, options?: BleuOptions) => BleuResult;
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