import { type NumericMatrix } from '../data';
export declare function validateMatrix(X: NumericMatrix): void;
export declare function validateXY(X: NumericMatrix, y: number[]): void;
export declare function sortedUniqueLabels(y: number[]): number[];
export declare function ensureClassPrior(classPrior: number[] | null | undefined, nClasses: number, label: 'priors' | 'classPrior'): number[] | null;
export declare function classLogPriorFromCounts(classCount: number[], fitPrior: boolean, classPrior: number[] | null): number[];
export declare function argmax(values: number[]): number;