Update app.py

app.py

@@ -307,7 +307,7 @@ def demo():
             db_progress = gr.Textbox(label="Vector Database Initialization Status", value="None", interactive=False)
             generate_db_btn = gr.Button("Generate Vector Database")
 
-         with gr.Tab("Step 3 - Initialize QA chain"):
+        with gr.Tab("Step 3 - Initialize QA chain"):
             with gr.Row():
                 llm_btn = gr.Radio(list_llm_simple, \
                     label="LLM models", value = list_llm_simple[0], type="index", info="Choose your LLM model")
@@ -323,7 +323,6 @@ def demo():
             with gr.Row():
                 qachain_btn = gr.Button("Initialize Question Answering chain")
 
-
         with gr.Tab("Step 4: Chatbot"):
             chatbot = gr.Chatbot(label="Chat with your PDF", height=300)
             with gr.Accordion("Advanced: Document References", open=False):