first commit

packages/@n8n/nodes-langchain/nodes/retrievers/RetrieverMultiQuery/RetrieverMultiQuery.node.ts

@@ -0,0 +1,117 @@
+import type { BaseLanguageModel } from '@langchain/core/language_models/base';
+import type { BaseRetriever } from '@langchain/core/retrievers';
+import { MultiQueryRetriever } from '@langchain/classic/retrievers/multi_query';
+import {
+	NodeConnectionTypes,
+	type INodeType,
+	type INodeTypeDescription,
+	type ISupplyDataFunctions,
+	type SupplyData,
+} from 'n8n-workflow';
+
+import { logWrapper } from '@n8n/ai-utilities';
+
+export class RetrieverMultiQuery implements INodeType {
+	description: INodeTypeDescription = {
+		displayName: 'MultiQuery Retriever',
+		name: 'retrieverMultiQuery',
+		icon: 'fa:box-open',
+		iconColor: 'black',
+		group: ['transform'],
+		version: 1,
+		description:
+			'Automates prompt tuning, generates diverse queries and expands document pool for enhanced retrieval.',
+		defaults: {
+			name: 'MultiQuery Retriever',
+		},
+		codex: {
+			categories: ['AI'],
+			subcategories: {
+				AI: ['Retrievers'],
+			},
+			resources: {
+				primaryDocumentation: [
+					{
+						url: 'https://docs.n8n.io/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.retrievermultiquery/',
+					},
+				],
+			},
+		},
+
+		inputs: [
+			{
+				displayName: 'Model',
+				maxConnections: 1,
+				type: NodeConnectionTypes.AiLanguageModel,
+				required: true,
+			},
+			{
+				displayName: 'Retriever',
+				maxConnections: 1,
+				type: NodeConnectionTypes.AiRetriever,
+				required: true,
+			},
+		],
+		outputs: [
+			{
+				displayName: 'Retriever',
+				maxConnections: 1,
+				type: NodeConnectionTypes.AiRetriever,
+			},
+		],
+		builderHint: {
+			inputs: {
+				ai_languageModel: { required: true },
+				ai_retriever: { required: true },
+			},
+		},
+		properties: [
+			{
+				displayName: 'Options',
+				name: 'options',
+				placeholder: 'Add Option',
+				description: 'Additional options to add',
+				type: 'collection',
+				default: {},
+				options: [
+					{
+						displayName: 'Query Count',
+						name: 'queryCount',
+						default: 3,
+						typeOptions: { minValue: 1 },
+						description: 'Number of different versions of the given question to generate',
+						type: 'number',
+					},
+				],
+			},
+		],
+	};
+
+	async supplyData(this: ISupplyDataFunctions, itemIndex: number): Promise<SupplyData> {
+		this.logger.debug('Supplying data for MultiQuery Retriever');
+
+		const options = this.getNodeParameter('options', itemIndex, {}) as { queryCount?: number };
+
+		const model = (await this.getInputConnectionData(
+			NodeConnectionTypes.AiLanguageModel,
+			itemIndex,
+		)) as BaseLanguageModel;
+
+		const baseRetriever = (await this.getInputConnectionData(
+			NodeConnectionTypes.AiRetriever,
+			itemIndex,
+		)) as BaseRetriever;
+
+		// TODO: Add support for parserKey
+
+		const retriever = MultiQueryRetriever.fromLLM({
+			llm: model,
+			retriever: baseRetriever,
+			...options,
+		});
+
+		return {
+			response: logWrapper(retriever, this),
+		};
+	}
+}