Update app.py

app.py

@@ -4,6 +4,15 @@ import pickle
 import faiss
 
 import os
+from langchain.text_splitter import CharacterTextSplitter
+from langchain.text_splitter import RecursiveCharacterTextSplitter
+from langchain.vectorstores import Chroma
+from langchain.document_loaders import TextLoader
+from langchain import PromptTemplate
+from langchain.chains import LLMChain
+from langchain.chains.qa_with_sources import load_qa_with_sources_chain
+from langchain.llms import OpenAI
+from langchain.vectorstores import FAISS
 from langchain_openai import OpenAIEmbeddings
 from langchain_openai import ChatOpenAI