Update app.py

Changing to HF model

app.py

@@ -68,7 +68,7 @@ if check_password():
             for page in bytes_data.pages:
                 input_text += page.extract_text()
 
-            st.session_state.ner_chain = LLMChain(llm=openai_chat_model, prompt=ENTITY_EXTRACTION_PROMPT)  
+            st.session_state.ner_chain = LLMChain(llm=hf_chat_model, prompt=ENTITY_EXTRACTION_PROMPT)  
             st.session_state.ners = st.session_state.ner_chain.run(input_text=input_text, verbose=True)
 
             input_text = input_text.replace('\n', '')
@@ -79,7 +79,7 @@ if check_password():
             st.session_state.chat_history = []
             st.session_state.formatted_prompt = get_qa_prompt(st.session_state.ners)
             st.session_state.chat_chain = ConversationalRetrievalChain.from_llm(
-                                                                    openai_chat_model,
+                                                                    hf_chat_model,
                                                                     chain_type="stuff", # "stuff", "map_reduce", "refine", "map_rerank"
                                                                     verbose=True,
                                                                     retriever=vector_store.as_retriever(),