Add huggingface end point instead of openai

tools.py

@@ -4,7 +4,7 @@ from langchain_core.messages import SystemMessage, HumanMessage, AnyMessage
 from langgraph.graph.message import add_messages
 from langchain_community.vectorstores import SupabaseVectorStore
 from supabase.client import  create_client
-from langchain_huggingface import HuggingFaceEmbeddings
+from langchain_huggingface import HuggingFaceEmbeddings, ChatHuggingFace, HuggingFaceEndpoint
 from serpapi import GoogleSearch
 from dotenv import load_dotenv
 import os
@@ -46,7 +46,9 @@ def web_search(query: str) -> str:
     )
     return context if context else "No results found."
 
-llm = ChatOpenAI(model = "gpt-3.5-turbo")
+llm = ChatHuggingFace(llm = HuggingFaceEndpoint(
+                url="https://api-inference.huggingface.co/models/Meta-DeepLearning/llama-2-7b-chat-hf",
+                temperature=0))
 tools = [add, subtract, divide, web_search]
 llm_with_tools = llm.bind_tools(tools, parallel_tool_calls = False)