70 lines
2.5 KiB
TypeScript
70 lines
2.5 KiB
TypeScript
import { BaseRetriever } from '@langchain/core/retrievers'
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import { BaseLanguageModel } from '@langchain/core/language_models/base'
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import { RetrievalQAChain } from 'langchain/chains'
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import { ConsoleCallbackHandler, CustomChainHandler, additionalCallbacks } from '../../../src/handler'
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import { ICommonObject, INode, INodeData, INodeParams } from '../../../src/Interface'
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import { getBaseClasses } from '../../../src/utils'
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class RetrievalQAChain_Chains implements INode {
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label: string
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name: string
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version: number
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type: string
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icon: string
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category: string
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baseClasses: string[]
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description: string
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inputs: INodeParams[]
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constructor() {
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this.label = 'Retrieval QA Chain'
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this.name = 'retrievalQAChain'
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this.version = 1.0
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this.type = 'RetrievalQAChain'
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this.icon = 'qa.svg'
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this.category = 'Chains'
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this.description = 'QA chain to answer a question based on the retrieved documents'
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this.baseClasses = [this.type, ...getBaseClasses(RetrievalQAChain)]
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this.inputs = [
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{
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label: 'Language Model',
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name: 'model',
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type: 'BaseLanguageModel'
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},
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{
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label: 'Vector Store Retriever',
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name: 'vectorStoreRetriever',
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type: 'BaseRetriever'
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}
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]
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}
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async init(nodeData: INodeData): Promise<any> {
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const model = nodeData.inputs?.model as BaseLanguageModel
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const vectorStoreRetriever = nodeData.inputs?.vectorStoreRetriever as BaseRetriever
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const chain = RetrievalQAChain.fromLLM(model, vectorStoreRetriever, { verbose: process.env.DEBUG === 'true' ? true : false })
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return chain
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}
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async run(nodeData: INodeData, input: string, options: ICommonObject): Promise<string> {
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const chain = nodeData.instance as RetrievalQAChain
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const obj = {
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query: input
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}
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const loggerHandler = new ConsoleCallbackHandler(options.logger)
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const callbacks = await additionalCallbacks(nodeData, options)
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if (options.socketIO && options.socketIOClientId) {
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const handler = new CustomChainHandler(options.socketIO, options.socketIOClientId)
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const res = await chain.call(obj, [loggerHandler, handler, ...callbacks])
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return res?.text
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} else {
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const res = await chain.call(obj, [loggerHandler, ...callbacks])
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return res?.text
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}
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}
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}
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module.exports = { nodeClass: RetrievalQAChain_Chains }
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