import type { SearchResult } from '../../core/types.js';
/**
 * Softmax: competitive normalization over an array of scores.
 * Returns probabilities that sum to 1.
 */
export declare function softmax(scores: number[]): number[];
/**
 * Normalize search results within a block to 0-1 range.
 * Prevents blocks with many entries from dominating via raw score magnitude.
 */
export declare function normalizeBlock(results: SearchResult[]): SearchResult[];
/**
 * Select blocks whose softmax attention exceeds the threshold.
 * Returns indices of selected blocks.
 */
export declare function selectBlocks(blockScores: number[], threshold?: number): number[];
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