Update app.py

app.py

@@ -10,6 +10,7 @@ from utils import *
 from retrieval_utils import *
 
 openai.api_key = os.getenv("api_key")
+openai.api_base = os.getenv("api_base")
 
 COT_PROMPT = "Let's think step by step."
 DIRECT_ANS_PROMPT = "The answer is"