Update app.py

app.py

@@ -149,7 +149,10 @@ def question_answer(url, file, question, openAI_key, model):
     
     if url.strip() != '' and file != None:
         return '[ERROR]: Both URL and PDF is provided. Please provide only one (either URL or PDF).'
-
+    
+    if model is None:
+        return '[ERROR]: You have not selected any model. Please select an LLM model.'
+        
     if url.strip() != '':
         glob_url = url
         download_pdf(glob_url, 'corpus.pdf')
@@ -225,8 +228,8 @@ with gr.Blocks() as demo:
             gr.Markdown("<center><h4>OR<h4></center>")
             file = gr.File(label='Upload your PDF/ Research Paper / Book here', file_types=['.pdf'])
             question = gr.Textbox(label='Enter your question here')
-            #model = gr.Radio(['gpt-3.5-turbo', 'gpt-3.5-turbo-16k', 'gpt-3.5-turbo-0613', 'gpt-3.5-turbo-16k-0613', 'text-davinci-003'], label='Select Model', default='gpt-3.5-turbo')
-            model = gr.Dropdown(choices=['gpt-3.5-turbo', 'gpt-3.5-turbo-16k', 'gpt-3.5-turbo-0613', 'gpt-3.5-turbo-16k-0613', 'text-davinci-003'], label='Select Model', default='gpt-3.5-turbo')
+            model = gr.Radio(['gpt-3.5-turbo', 'gpt-3.5-turbo-16k', 'gpt-3.5-turbo-0613', 'gpt-3.5-turbo-16k-0613', 'text-davinci-003'], label='Select Model', default='gpt-3.5-turbo')
+            #model = gr.Dropdown(choices=['gpt-3.5-turbo', 'gpt-3.5-turbo-16k', 'gpt-3.5-turbo-0613', 'gpt-3.5-turbo-16k-0613', 'text-davinci-003'], label='Select Large Language Model', default='gpt-3.5-turbo')
             btn = gr.Button(value='Submit')
             btn.style(full_width=True)