/**
 * 语义搜索类 - 基于向量嵌入的文档搜索
 */
export interface SemanticSearchOptions {
    model?: string;
    topK?: number;
    minScore?: number;
}
export interface SemanticSearchResult {
    text: string;
    score: number;
    index: number;
}
export interface DocumentChunk {
    text: string;
    embedding?: number[];
    metadata?: Record<string, unknown>;
}
export declare class SemanticSearch {
    private embedder;
    private modelName;
    private chunks;
    constructor(modelName?: string);
    /**
     * 初始化嵌入模型
     */
    private getEmbedder;
    /**
     * 生成文本的向量嵌入
     */
    embed(text: string): Promise<number[]>;
    /**
     * 将文档分割成块并索引
     */
    indexDocument(text: string, chunkSize?: number, overlap?: number): Promise<number>;
    /**
     * 添加预处理的块
     */
    addChunk(text: string, metadata?: Record<string, unknown>): Promise<void>;
    /**
     * 语义搜索
     */
    search(query: string, options?: SemanticSearchOptions): Promise<SemanticSearchResult[]>;
    /**
     * 计算余弦相似度
     */
    private cosineSimilarity;
    /**
     * 将文本分割成块
     */
    private splitIntoChunks;
    /**
     * 清空索引
     */
    clear(): void;
    /**
     * 获取索引块数量
     */
    getChunkCount(): number;
    /**
     * 释放资源
     */
    dispose(): Promise<void>;
}
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