makechain.ts

export const makeChain = (vectorstore: PineconeStore) => {
  const model = new OpenAI({
    temperature: 0,
    modelName: 'gpt-4'
  });
  const chain = ConversationalRetrievalQAChain.fromLLM(
    model,
    vectorstore.asRetriever(),
    {
      qaTemplate: QA_PROMPT,
      questionGeneratorTemplate: CONDENSE_PROMPT,
      returnSourceDocuments: true
    },
  );
  return chain;
};