import * as tf from '../backend/adapter';
/**
 * Optimised Euclidean pairwise distance using the identity
 * ‖x − y‖² = ‖x‖² + ‖y‖² − 2·xᵀy to avoid building an (n,n,d) tensor.
 */
export declare function pairwise_euclidean_matrix(points: tf.Tensor2D): tf.Tensor2D;
export declare function pairwise_distance_matrix(points: tf.Tensor2D, metric?: 'euclidean' | 'manhattan' | 'cosine'): tf.Tensor2D;
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