122 lines
4.0 KiB
TypeScript
122 lines
4.0 KiB
TypeScript
import { VectorStore } from 'langchain/vectorstores/base'
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import { INode, INodeData, INodeParams } from '../../../src/Interface'
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import { HydeRetriever, HydeRetrieverOptions, PromptKey } from 'langchain/retrievers/hyde'
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import { BaseLanguageModel } from 'langchain/base_language'
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import { PromptTemplate } from 'langchain/prompts'
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class HydeRetriever_Retrievers implements INode {
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label: string
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name: string
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description: string
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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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inputs: INodeParams[]
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constructor() {
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this.label = 'Hyde Retriever'
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this.name = 'HydeRetriever'
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this.type = 'HydeRetriever'
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this.icon = 'hyderetriever.svg'
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this.category = 'Retrievers'
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this.description = 'Use HyDE retriever to retrieve from a vector store'
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this.baseClasses = [this.type, 'BaseRetriever']
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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',
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name: 'vectorStore',
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type: 'VectorStore'
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},
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{
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label: 'Prompt Key',
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name: 'promptKey',
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type: 'options',
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options: [
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{
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label: 'websearch',
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name: 'websearch'
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},
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{
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label: 'scifact',
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name: 'scifact'
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},
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{
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label: 'arguana',
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name: 'arguana'
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},
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{
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label: 'trec-covid',
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name: 'trec-covid'
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},
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{
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label: 'fiqa',
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name: 'fiqa'
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},
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{
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label: 'dbpedia-entity',
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name: 'dbpedia-entity'
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},
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{
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label: 'trec-news',
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name: 'trec-news'
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},
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{
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label: 'mr-tydi',
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name: 'mr-tydi'
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}
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],
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default: 'websearch'
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},
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{
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label: 'Custom Prompt',
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name: 'customPrompt',
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description: 'If custom prompt is used, this will override Prompt Key',
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placeholder: 'Please write a passage to answer the question\nQuestion: {question}\nPassage:',
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type: 'string',
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rows: 4,
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additionalParams: true,
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optional: true
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},
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{
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label: 'Top K',
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name: 'topK',
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description: 'Number of top results to fetch. Default to 4',
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placeholder: '4',
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type: 'number',
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default: 4,
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additionalParams: true,
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optional: true
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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 llm = nodeData.inputs?.model as BaseLanguageModel
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const vectorStore = nodeData.inputs?.vectorStore as VectorStore
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const promptKey = nodeData.inputs?.promptKey as PromptKey
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const customPrompt = nodeData.inputs?.customPrompt as string
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const topK = nodeData.inputs?.topK as string
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const k = topK ? parseInt(topK, 10) : 4
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const obj: HydeRetrieverOptions<any> = {
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llm,
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vectorStore,
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k
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}
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if (customPrompt) obj.promptTemplate = PromptTemplate.fromTemplate(customPrompt)
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else if (promptKey) obj.promptTemplate = promptKey
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const retriever = new HydeRetriever(obj)
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return retriever
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}
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}
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module.exports = { nodeClass: HydeRetriever_Retrievers }
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