export * from './utils';
/** Options for ROUGE-N evaluation */
export interface RougeNOptions {
    /** The size of the ngram used (default: 1) */
    n?: number;
    /** The beta value used for the f-measure (default: 1.0) */
    beta?: number;
    /** Whether comparison is case-sensitive (default: true) */
    caseSensitive?: boolean;
    /** Custom ngram generator function */
    nGram?: (tokens: string[], n: number) => string[];
    /** Custom string tokenizer */
    tokenizer?: (input: string) => string[];
}
/** Options for ROUGE-S (skip-bigram) evaluation */
export interface RougeSOptions {
    /** The beta value used for the f-measure (default: 1.0) */
    beta?: number;
    /** Whether comparison is case-sensitive (default: true) */
    caseSensitive?: boolean;
    /** Maximum skip distance between words (default: Infinity) */
    maxSkip?: number;
    /** Custom skip-bigram generator function */
    skipBigram?: (tokens: string[], maxSkip?: number) => string[];
    /** Custom string tokenizer */
    tokenizer?: (input: string) => string[];
}
/** Options for ROUGE-L (LCS) evaluation */
export interface RougeLOptions {
    /** The beta value used for the f-measure (default: 1.0) */
    beta?: number;
    /** Whether comparison is case-sensitive (default: true) */
    caseSensitive?: boolean;
    /** Custom LCS function */
    lcs?: (a: string[], b: string[]) => string[];
    /** Custom sentence segmenter */
    segmenter?: (input: string) => string[];
    /** Custom string tokenizer */
    tokenizer?: (input: string) => string[];
}
/**
 * Computes the ROUGE-N score for a candidate summary.
 *
 * Configuration object schema and defaults:
 * ```
 * {
 * 	n: 1                            // The size of the ngram used
 * 	beta: 1.0                       // The beta value used for the f-measure
 * 	caseSensitive: true             // Whether comparison is case-sensitive
 * 	nGram: <inbuilt function>,      // The ngram generator function
 * 	tokenizer: <inbuilt function>   // The string tokenizer
 * }
 * ```
 *
 * `nGram` has a type signature of ((Array<string>, number) => Array<string>)
 * `tokenizer` has a type signature of ((string) => Array<string)
 *
 * @method n
 * @param  {string}     cand        The candidate summary to be evaluated
 * @param  {string}     ref         The reference summary to be evaluated against
 * @param  {Object}     opts        Configuration options (see example)
 * @return {number}                 The ROUGE-N F-score
 */
export declare function n(cand: string, ref: string, opts?: RougeNOptions): number;
/**
 * Computes the ROUGE-S score for a candidate summary.
 *
 * Configuration object schema and defaults:
 * ```
 * {
 * 	beta: 1.0                           // The beta value used for the f-measure
 * 	caseSensitive: true                 // Whether comparison is case-sensitive
 * 	maxSkip: Infinity                   // Maximum skip distance between words
 * 	skipBigram: <inbuilt function>,     // The skip-bigram generator function
 * 	tokenizer: <inbuilt function>       // The string tokenizer
 * }
 * ```
 *
 * `skipBigram` has a type signature of ((Array<string>, number) => Array<string>)
 * `tokenizer` has a type signature of ((string) => Array<string)
 *
 * @method s
 * @param  {string}     cand        The candidate summary to be evaluated
 * @param  {string}     ref         The reference summary to be evaluated against
 * @param  {Object}     opts        Configuration options (see example)
 * @return {number}                 The ROUGE-S score
 */
export declare function s(cand: string, ref: string, opts?: RougeSOptions): number;
/**
 * Computes the ROUGE-L score for a candidate summary
 *
 * Configuration object schema and defaults:
 * ```
 * {
 * 	beta: 1.0                           // The beta value used for the f-measure
 * 	caseSensitive: true                 // Whether comparison is case-sensitive
 * 	lcs: <inbuilt function>             // The least common subsequence function
 * 	segmenter: <inbuilt function>,      // The sentence segmenter
 * 	tokenizer: <inbuilt function>       // The string tokenizer
 * }
 * ```
 *
 * `lcs` has a type signature of ((Array<string>, Array<string>) => Array<string>)
 * `segmenter` has a type signature of ((string) => Array<string)
 * `tokenizer` has a type signature of ((string) => Array<string)
 *
 * @method l
 * @param  {string}     cand        The candidate summary to be evaluated
 * @param  {string}     ref         The reference summary to be evaluated against
 * @param  {Object}     opts        Configuration options (see example)
 * @return {number}                 The ROUGE-L score
 */
export declare function l(cand: string, ref: string, opts?: RougeLOptions): number;
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