Update app.py

app.py

@@ -303,11 +303,14 @@ def bot(history, choice, tts_choice, retrieval_mode):
     history.append([response, None])  # Ensure the response is added in the correct format
 
 # Langchain imports
+from langchain_openai import ChatOpenAI
 from langchain.agents import tool
 from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
 from langchain_core.messages import AIMessage, HumanMessage
-from langchain_core.tools import OpenAIToolsAgentOutputParser
-from langchain_core.tools import format_to_openai_tool_messages
+from langchain.agents.format_scratchpad.openai_tools import (
+    format_to_openai_tool_messages,)
+from langchain.agents.output_parsers.openai_tools import OpenAIToolsAgentOutputParser
+from langchain.agents import AgentExecutor
 from langchain import OpenAI