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add conversational retrieval agent

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This commit is contained in:
Henry
2023-08-06 19:45:21 +01:00
parent d208eae868
commit 0ae6f53295
18 changed files with 1018 additions and 103 deletions
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packages/components/nodes/chains/ConversationalRetrievalQAChain/ConversationalRetrievalQAChain.ts
+16 -28
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@@ -1,10 +1,9 @@
import { BaseLanguageModel } from 'langchain/base_language'
import { ICommonObject, IMessage, INode, INodeData, INodeParams } from '../../../src/Interface'
import { getBaseClasses } from '../../../src/utils'
import { ICommonObject, INode, INodeData, INodeParams } from '../../../src/Interface'
import { getBaseClasses, mapChatHistory } from '../../../src/utils'
import { ConversationalRetrievalQAChain, QAChainParams } from 'langchain/chains'
import { AIMessage, HumanMessage } from 'langchain/schema'
import { BaseRetriever } from 'langchain/schema/retriever'
import { BaseChatMemory, BufferMemory, ChatMessageHistory, BufferMemoryInput } from 'langchain/memory'
import { BufferMemory, BufferMemoryInput } from 'langchain/memory'
import { PromptTemplate } from 'langchain/prompts'
import { ConsoleCallbackHandler, CustomChainHandler } from '../../../src/handler'
import {
@@ -105,7 +104,7 @@ class ConversationalRetrievalQAChain_Chains implements INode {
const systemMessagePrompt = nodeData.inputs?.systemMessagePrompt as string
const returnSourceDocuments = nodeData.inputs?.returnSourceDocuments as boolean
const chainOption = nodeData.inputs?.chainOption as string
const memory = nodeData.inputs?.memory
const externalMemory = nodeData.inputs?.memory
const obj: any = {
verbose: process.env.DEBUG === 'true' ? true : false,
@@ -113,7 +112,9 @@ class ConversationalRetrievalQAChain_Chains implements INode {
template: CUSTOM_QUESTION_GENERATOR_CHAIN_PROMPT
}
}
if (returnSourceDocuments) obj.returnSourceDocuments = returnSourceDocuments
if (chainOption === 'map_reduce') {
obj.qaChainOptions = {
type: 'map_reduce',
@@ -142,20 +143,21 @@ class ConversationalRetrievalQAChain_Chains implements INode {
} as QAChainParams
}
if (memory) {
memory.inputKey = 'question'
memory.memoryKey = 'chat_history'
if (chainOption === 'refine') memory.outputKey = 'output_text'
else memory.outputKey = 'text'
obj.memory = memory
if (externalMemory) {
externalMemory.memoryKey = 'chat_history'
externalMemory.inputKey = 'question'
externalMemory.outputKey = 'text'
externalMemory.returnMessages = true
if (chainOption === 'refine') externalMemory.outputKey = 'output_text'
obj.memory = externalMemory
} else {
const fields: BufferMemoryInput = {
memoryKey: 'chat_history',
inputKey: 'question',
outputKey: 'text',
returnMessages: true
}
if (chainOption === 'refine') fields.outputKey = 'output_text'
else fields.outputKey = 'text'
obj.memory = new BufferMemory(fields)
}
@@ -166,7 +168,6 @@ class ConversationalRetrievalQAChain_Chains implements INode {
async run(nodeData: INodeData, input: string, options: ICommonObject): Promise<string | ICommonObject> {
const chain = nodeData.instance as ConversationalRetrievalQAChain
const returnSourceDocuments = nodeData.inputs?.returnSourceDocuments as boolean
const memory = nodeData.inputs?.memory
const chainOption = nodeData.inputs?.chainOption as string
let model = nodeData.inputs?.model
@@ -177,21 +178,8 @@ class ConversationalRetrievalQAChain_Chains implements INode {
const obj = { question: input }
// If external memory like Zep, Redis is being used, ignore below
if (!memory && chain.memory && options && options.chatHistory) {
const chatHistory = []
const histories: IMessage[] = options.chatHistory
const memory = chain.memory as BaseChatMemory
for (const message of histories) {
if (message.type === 'apiMessage') {
chatHistory.push(new AIMessage(message.message))
} else if (message.type === 'userMessage') {
chatHistory.push(new HumanMessage(message.message))
}
}
memory.chatHistory = new ChatMessageHistory(chatHistory)
chain.memory = memory
if (options && options.chatHistory && chain.memory) {
;(chain.memory as any).chatHistory = mapChatHistory(options)
}
const loggerHandler = new ConsoleCallbackHandler(options.logger)