/**
 * Shared label-comparison helpers for clustering parity tests.
 *
 * Cluster ids are arbitrary, so reference comparisons must be invariant to
 * relabelling. Noise (`-1`) is identity, never permuted.
 */
/** Exact label equality up to a bijective cluster-id permutation (noise fixed). */
export declare function labels_equivalent_with_noise(a: number[], b: number[]): boolean;
/**
 * Cluster-assignment agreement in `[0, 1]` under the optimal greedy
 * cluster-id alignment, with noise (`-1`) treated as its own label. Used
 * where tie-ordering differences make exact equivalence too strict.
 */
export declare function alignment_agreement(mine: number[], reference: number[]): number;