update app.py

app.py

@@ -65,7 +65,7 @@ def create_conversational_chain(vector_store):
                         #model_type="llama", config={'max_new_tokens': 500, 'temperature': 0.01})
     llm = Replicate(
         streaming = True,
-        model = "replicate/llama-2-70b-chat:58d078176e02c219e11eb4da5a02a7830a283b14cf8f94537af893ccff5ee781",
+        model = "replicate/llama-2-70b-chat:r8_AA3K1fhDykqLa5M74E5V0w5ss1z0P9S3foWJl",
         callbacks=[StreamingStdOutCallbackHandler()],
         input = {"temperature": 0.01, "max_length" :500,"top_p":1})
     memory = ConversationBufferMemory(memory_key="chat_history", return_messages=True)