clear data button

app.py

@@ -28,6 +28,11 @@ def pdf_changes(pdf_doc):
         return_source_documents=False)
     return "Ready"
 
+def clear_data():
+    global qa
+    qa = None
+    return "Data cleared"
+
 def add_text(history, text):
     history = history + [(text, None)]
     return history, ""
@@ -75,13 +80,15 @@ with gr.Blocks(css=css) as demo:
             with gr.Row():
                 langchain_status = gr.Textbox(label="Status", placeholder="", interactive=False)
                 load_pdf = gr.Button("Convert PDF to Magic AI language")
+                clear_btn = gr.Button("Clear Data")
         
-        chatbot = gr.Chatbot([], elem_id="chatbot", show_copy_button=True).style(height=350)
+        chatbot = gr.Chatbot([], elem_id="chatbot").style(height=350)
         question = gr.Textbox(label="Question", placeholder="Type your question and hit Enter")
         submit_btn = gr.Button("Send Message")
-        
+
     load_pdf.click(loading_pdf, None, langchain_status, queue=False)
     load_pdf.click(pdf_changes, inputs=[pdf_doc], outputs=[langchain_status], queue=False)
+    clear_btn.click(clear_data, outputs=[langchain_status], queue=False)
     question.submit(add_text, [chatbot, question], [chatbot, question]).then(
         bot, chatbot, chatbot
     )