fixed imports

agent.py

@@ -10,7 +10,7 @@ from langchain_community.document_loaders import ArxivLoader
 from langchain_core.messages import SystemMessage, HumanMessage
 from langchain_core.tools import tool
 from langchain.tools.retriever import create_retriever_tool
-from langchain.vectorstores import Pinecone
+from langchain_community.vectorstores import Pinecone
 import pinecone
 
 

app.py

@@ -3,7 +3,7 @@ import gradio as gr
 import requests
 import pandas as pd
 from agent import build_graph
-from langchain_core.messages import HumanMessage, SystemMessage
+from langchain_core.messages import HumanMessage
 
 DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"