Update app.py

app.py

@@ -139,7 +139,8 @@ def demo():
         qachain_btn.click(initialize_LLM, inputs=[llm_btn, slider_temperature, slider_maxtokens, slider_topk, vector_db], outputs=[qa_chain, llm_progress])
 
         submit_btn.click(conversation, inputs=[qa_chain, msg, chatbot], outputs=[qa_chain, msg, chatbot] + doc_sources + source_pages)
-        msg.submit(conversation, inputs=[qa_chain, msg, chatbot], outputs=[qa_chain, msg, chatbot] + doc_sources + source_pages)        
+        msg.submit(conversation, inputs=[qa_chain, msg, chatbot], outputs=[qa_chain, msg, chatbot] + doc_sources + source_pages)
+        clear_btn.click(lambda: (qa_chain.reset(), chatbot.clear(), *[doc_source.clear() for doc_source in doc_sources], *[source_page.clear() for source_page in source_pages]), inputs=[qa_chain, chatbot, *doc_sources, *source_pages])
         
     demo.queue().launch(debug=True)