adding online PDF loader

app.py

@@ -38,10 +38,11 @@ def get_hugging_face_model(model_id,API_key,temperature=0.1):
     return chat_llm
 
 def chat_application(llm_service,key):
-    if llm_model == 'HuggingFace':
+    if llm_service == 'HuggingFace':
         llm = get_hugging_face_model(model_id='tiiuae/falcon-7b-instruct',API_key=key)
     else:
-        llm_model = get_openai_chat_model(API_key=key)
+        llm = get_openai_chat_model(API_key=key)
+    return llm 
 
 
 def document_loader(file_path,api_key,doc_type='pdf',llm='Huggingface'):