Adding Langchain QA

app.py

@@ -131,7 +131,7 @@ with gr.Blocks(css=css) as demo:
         question = gr.Textbox(label="Question", placeholder="Type your question and hit Enter")
         submit_button = gr.Button("Send Message")
     load_pdf.click(loading_file, None, langchain_status, queue=False)    
-    load_pdf.click(document_loader, inputs=[pdf_doc,file_extension,API_key], outputs=[langchain_status], queue=False)
+    load_pdf.click(document_loader, inputs=[pdf_doc,API_key,file_extension,LLM_option], outputs=[langchain_status], queue=False)
     
     # question.submit(add_text, [chatbot, question], [chatbot, question]).then(
     #     bot, chatbot, chatbot