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* AgentKits — Reranker Module (Enhanced)
*
* Cross-encoder and API-based reranking for RAG quality.
* Supports: Cohere Rerank, Jina, custom scoring.
*
* Usage:
* import { createCrossEncoder } from 'agentkits/reranker';
* const reranker = createCrossEncoder({ provider: 'cohere', apiKey: '...' });
* const results = await reranker.rerank('query', documents);
*/
// ── Types ──────────────────────────────────────────────────────────
export type RerankerProvider = 'cohere' | 'jina' | 'custom';
export interface RerankerConfig {
provider?: RerankerProvider;
apiKey?: string;
model?: string;
baseUrl?: string;
topK?: number;
}
export interface RerankedDocument {
index: number;
text: string;
score: number;
}
export interface RerankerClient {
/** Rerank documents by relevance to query */
rerank(query: string, documents: string[], options?: { topK?: number }): Promise<RerankedDocument[]>;
/** Score a single query-document pair */
score(query: string, document: string): Promise<number>;
}
interface ProviderDefaults {
model: string;
baseUrl: string;
}
const PROVIDER_DEFAULTS: Record<RerankerProvider, ProviderDefaults> = {
cohere: { model: 'rerank-v3.5', baseUrl: 'https://api.cohere.com/v2' },
jina: { model: 'jina-reranker-v2-base-multilingual', baseUrl: 'https://api.jina.ai/v1' },
custom: { model: 'rerank', baseUrl: 'http://localhost:8080' },
};
const ENV_MAP: Record<RerankerProvider, string[]> = {
cohere: ['COHERE_API_KEY'],
jina: ['JINA_API_KEY'],
custom: ['RERANKER_API_KEY'],
};
// ── Simple TF-IDF based fallback scorer ────────────────────────────
function tfidfScore(query: string, document: string): number {
const qTokens = query.toLowerCase().split(/\W+/).filter(Boolean);
const dTokens = document.toLowerCase().split(/\W+/).filter(Boolean);
const dSet = new Set(dTokens);
let hits = 0;
for (const t of qTokens) {
if (dSet.has(t)) hits++;
}
return qTokens.length > 0 ? hits / qTokens.length : 0;
}
// ── Factory ────────────────────────────────────────────────────────
export function createCrossEncoder(config: RerankerConfig = {}): RerankerClient {
const provider = config.provider ?? 'cohere';
const defaults = PROVIDER_DEFAULTS[provider];
const model = config.model ?? defaults.model;
const baseUrl = config.baseUrl ?? defaults.baseUrl;
const apiKey = config.apiKey ?? ENV_MAP[provider].map(k => process.env[k]).find(Boolean);
const defaultTopK = config.topK ?? 10;
async function callAPI(query: string, documents: string[], topK: number): Promise<RerankedDocument[]> {
if (!apiKey) {
// Fallback to TF-IDF scoring
const scored = documents.map((text, index) => ({
index,
text,
score: tfidfScore(query, text),
}));
scored.sort((a, b) => b.score - a.score);
return scored.slice(0, topK);
}
const url = provider === 'cohere'
? `${baseUrl}/rerank`
: `${baseUrl}/rerank`;
const body = provider === 'cohere'
? { model, query, documents, top_n: topK }
: { model, query, documents, top_n: topK };
const resp = await fetch(url, {
method: 'POST',
headers: {
'Content-Type': 'application/json',
'Authorization': `Bearer ${apiKey}`,
},
body: JSON.stringify(body),
});
if (!resp.ok) {
throw new Error(`[AgentKits] Reranker API error: ${resp.status} ${await resp.text()}`);
}
const data: any = await resp.json();
const results = data.results ?? data.data ?? [];
return results.map((r: any) => ({
index: r.index,
text: documents[r.index],
score: r.relevance_score ?? r.score ?? 0,
}));
}
return {
async rerank(query, documents, options) {
const topK = options?.topK ?? defaultTopK;
return callAPI(query, documents, Math.min(topK, documents.length));
},
async score(query, document) {
const results = await callAPI(query, [document], 1);
return results[0]?.score ?? 0;
},
};
}
/**
* Quick rerank with TF-IDF (no API needed).
*/
export function localRerank(query: string, documents: string[], topK = 10): RerankedDocument[] {
const scored = documents.map((text, index) => ({
index,
text,
score: tfidfScore(query, text),
}));
scored.sort((a, b) => b.score - a.score);
return scored.slice(0, topK);
}
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