Update app.py

changing to smaller model for memory management - google/flan-t5-base

app.py

@@ -49,7 +49,7 @@ def get_vectorstore(text_chunks):
 
 def get_conversation_chain(vectorstore):
     #llm = ChatOpenAI()
-    llm = HuggingFaceHub(repo_id="google/flan-t5-xxl", model_kwargs={"temperature":0.5, "max_length":512})
+    llm = HuggingFaceHub(repo_id="google/flan-t5-base", model_kwargs={"temperature":0.5, "max_length":512})
 
     memory = ConversationBufferMemory(
         memory_key='chat_history', return_messages=True)