Update LangChain_QA_Panel_App.ipynb

LangChain_QA_Panel_App.ipynb

@@ -123,7 +123,7 @@
     "    retriever = db.as_retriever(search_type=\"similarity\", search_kwargs={\"k\": k})\n",
     "    # create a chain to answer questions \n",
     "    qa = RetrievalQA.from_chain_type(\n",
-    "        llm=OpenAI(temperature=0.9, model_name="gpt-3.5-turbo"), chain_type=chain_type, retriever=retriever, return_source_documents=True)\n",
+    "        llm=OpenAI(temperature=0.9, model_name='gpt-3.5-turbo'), chain_type=chain_type, retriever=retriever, return_source_documents=True)\n",
     "    result = qa({\"query\": query})\n",
     "    print(result['result'])\n",
     "    return result"