Update rag_langgraph.py

rag_langgraph.py

@@ -5,9 +5,10 @@ from typing import Annotated, Any, Dict, List, Optional, Sequence, Tuple, TypedD
 from langchain.agents import AgentExecutor, create_openai_tools_agent
 from langgraph.graph import StateGraph, END
 from langchain_community.tools.tavily_search import TavilySearchResults
+from langchain_core.messages import BaseMessage, HumanMessage
 from langchain_core.output_parsers.openai_functions import JsonOutputFunctionsParser
 from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
-from langchain_core.tools import BaseMessage, HumanMessage, tool
+from langchain_core.tools import tool
 from langchain_openai import ChatOpenAI
 
 LLM = "gpt-4o"