Update app.py

app.py

@@ -9,6 +9,7 @@ from langchain_openai import AzureChatOpenAI, ChatOpenAI
 from sklearn.datasets import fetch_openml
 
 gpt35 = ChatOpenAI(
+    openai_api_key=os.environ["OPENAI_API_KEY"],
     model="gpt-3.5-turbo",
     temperature=0
 )