Update app.py

app.py

@@ -50,7 +50,7 @@ PROMPT = PromptTemplate(
 )
 chain_type_kwargs = {"prompt": PROMPT}
 
-llm = HuggingFaceHub(repo_id="NousResearch/Llama-2-13b-hf", model_kwargs={"temperature":0.1, "max_new_tokens":250})
+llm = HuggingFaceHub(repo_id="google/flan-ul2", model_kwargs={"temperature":0.1, "max_new_tokens":250})
 
 qachain=RetrievalQA.from_chain_type(llm, retriever=vectorstore.as_retriever(), memory=memory, chain_type_kwargs=chain_type_kwargs)