Update core/workflow_nodes.py

core/workflow_nodes.py

@@ -2,6 +2,7 @@ from typing import Dict
 from langchain.prompts import ChatPromptTemplate
 from langchain_core.output_parsers import StrOutputParser
 import sys
+import os
 sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'models'))
 sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'config'))
 from models import llm, retriever