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import { BaseLanguageModel } from 'langchain/base_language'
import { ICommonObject, INode, INodeData, INodeParams, VectorStoreRetriever } from '../../../src/Interface'
import { CustomChainHandler, getBaseClasses } from '../../../src/utils'
import { MultiRetrievalQAChain } from 'langchain/chains'
class MultiRetrievalQAChain_Chains implements INode {
label: string
name: string
type: string
icon: string
category: string
baseClasses: string[]
description: string
inputs: INodeParams[]
constructor() {
this.label = 'Multi Retrieval QA Chain'
this.name = 'multiRetrievalQAChain'
this.type = 'MultiRetrievalQAChain'
this.icon = 'chain.svg'
this.category = 'Chains'
this.description = 'QA Chain that automatically picks an appropriate vector store from multiple retrievers'
this.baseClasses = [this.type, ...getBaseClasses(MultiRetrievalQAChain)]
this.inputs = [
{
label: 'Language Model',
name: 'model',
type: 'BaseLanguageModel'
},
{
label: 'Vector Store Retriever',
name: 'vectorStoreRetriever',
type: 'VectorStoreRetriever',
list: true
},
{
label: 'Return Source Documents',
name: 'returnSourceDocuments',
type: 'boolean',
optional: true
}
]
}
async init(nodeData: INodeData): Promise<any> {
const model = nodeData.inputs?.model as BaseLanguageModel
const vectorStoreRetriever = nodeData.inputs?.vectorStoreRetriever as VectorStoreRetriever[]
const returnSourceDocuments = nodeData.inputs?.returnSourceDocuments as boolean
const retrieverNames = []
const retrieverDescriptions = []
const retrievers = []
for (const vs of vectorStoreRetriever) {
retrieverNames.push(vs.name)
retrieverDescriptions.push(vs.description)
retrievers.push(vs.vectorStore.asRetriever((vs.vectorStore as any).k ?? 4))
}
const chain = MultiRetrievalQAChain.fromLLMAndRetrievers(model, {
retrieverNames,
retrieverDescriptions,
retrievers,
retrievalQAChainOpts: { verbose: process.env.DEBUG === 'true' ? true : false, returnSourceDocuments }
})
return chain
}
async run(nodeData: INodeData, input: string, options: ICommonObject): Promise<string | ICommonObject> {
const chain = nodeData.instance as MultiRetrievalQAChain
const returnSourceDocuments = nodeData.inputs?.returnSourceDocuments as boolean
const obj = { input }
if (options.socketIO && options.socketIOClientId) {
const handler = new CustomChainHandler(options.socketIO, options.socketIOClientId, 2, returnSourceDocuments)
const res = await chain.call(obj, [handler])
if (res.text && res.sourceDocuments) return res
return res?.text
} else {
const res = await chain.call(obj)
if (res.text && res.sourceDocuments) return res
return res?.text
}
}
}
module.exports = { nodeClass: MultiRetrievalQAChain_Chains }
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