Update app_utils.py

app_utils.py

@@ -16,7 +16,7 @@ from langchain.embeddings.openai import OpenAIEmbeddings # OpenAIGPTEmbeddings
 from langchain.text_splitter import CharacterTextSplitter #     CharacterTextSplitter is a class in the langchain.text_splitter module that can be used to split text into chunks.
 #import streamlit as st
 from langchain.indexes import VectorstoreIndexCreator #导入向量存储索引创建器
-from langchain.vectorstores import DocArrayInMemorySearch #向量存储
+#from langchain.vectorstores import DocArrayInMemorySearch #向量存储
 from tenacity import (
     retry,
     stop_after_attempt,