fix bug

app.py

@@ -14,6 +14,16 @@ def format_docs(docs):
   return "\n\n".join(doc.page_content for doc in docs)
 
 
+
+
+
+embeddings = OpenAIEmbeddings()
+db = FAISS.load_local("faiss_index", embeddings, allow_dangerous_deserialization=True)
+retriever = db.as_retriever(k=3)
+
+
+llm = ChatOpenAI(model="gpt-3.5-turbo-0125")
+
 prompt = ChatPromptTemplate.from_messages([
     ('system',
      "You are a KCE chatbot, and you are assisting customers with the inquires about the company."
@@ -31,12 +41,6 @@ rag_chain = (
     | StrOutputParser()
 )
 
-
-embeddings = OpenAIEmbeddings()
-db = FAISS.load_local("faiss_index", embeddings, allow_dangerous_deserialization=True)
-
-llm = ChatOpenAI(model="gpt-3.5-turbo-0125")
-
 def chat_gen(message, history):
   history_openai_format = []
   for human, assistant in history: