Update app.py

app.py

@@ -17,11 +17,14 @@ import requests
 from typing import Sequence
 from typing_extensions import TypedDict, Annotated
 
-from langchain_openai import OpenAIEmbeddings
-from langchain_community.vectorstores import Chroma
-from langchain_core.messages import HumanMessage, AIMessage, ToolMessage
+# Updated imports for LangChain
+from langchain.embeddings.openai import OpenAIEmbeddings
+from langchain.vectorstores import Chroma
+from langchain.schema import HumanMessage, AIMessage, ToolMessage
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain.tools.retriever import create_retriever_tool
+
+# Imports for LangGraph remain the same
 from langgraph.graph import END, StateGraph, START
 from langgraph.prebuilt import ToolNode
 from langgraph.graph.message import add_messages