/**
 * Represents a split of a dataset into training and validation sets.
 */
export type SplitData<T> = {
    trainingData: T[];
    validationData: T[];
};
/**
 * Splits an array of objects into training and validation datasets, grouped by a specific feature and shuffled randomly within each group.
 */
export declare function splitData<T>(data: T[], features: (keyof T)[], splitRatio: number): SplitData<T>;
/**
 * Shuffles the given array in place using the Fisher-Yates shuffle algorithm.
 */
export declare function shuffleData<T>(data: T[]): void;