Feature: Add Jina AI Rerank Retriever (#3898)

2026-06-29 15:01:11 +03:00 · 2025-01-20 19:33:42 +07:00
parent 5c9f17814b
commit 9c2203be62
3 changed files with 185 additions and 0 deletions
@@ -0,0 +1,51 @@
+import { Callbacks } from '@langchain/core/callbacks/manager'
+import { Document } from '@langchain/core/documents'
+import axios from 'axios'
+import { BaseDocumentCompressor } from 'langchain/retrievers/document_compressors'
+
+export class JinaRerank extends BaseDocumentCompressor {
+    private jinaAPIKey: string
+    private readonly JINA_RERANK_API_URL = 'https://api.jina.ai/v1/rerank'
+    private model: string = 'jina-reranker-v2-base-multilingual'
+    private readonly topN: number
+
+    constructor(jinaAPIKey: string, model: string, topN: number) {
+        super()
+        this.jinaAPIKey = jinaAPIKey
+        this.model = model
+        this.topN = topN
+    }
+    async compressDocuments(
+        documents: Document<Record<string, any>>[],
+        query: string,
+        _?: Callbacks | undefined
+    ): Promise<Document<Record<string, any>>[]> {
+        if (documents.length === 0) {
+            return []
+        }
+        const config = {
+            headers: {
+                Authorization: `Bearer ${this.jinaAPIKey}`,
+                'Content-Type': 'application/json'
+            }
+        }
+        const data = {
+            model: this.model,
+            query: query,
+            documents: documents.map((doc) => doc.pageContent),
+            top_n: this.topN
+        }
+        try {
+            let returnedDocs = await axios.post(this.JINA_RERANK_API_URL, data, config)
+            const finalResults: Document<Record<string, any>>[] = []
+            returnedDocs.data.results.forEach((result: any) => {
+                const doc = documents[result.index]
+                doc.metadata.relevance_score = result.relevance_score
+                finalResults.push(doc)
+            })
+            return finalResults
+        } catch (error) {
+            return documents
+        }
+    }
+}