Update app.py

app.py

@@ -43,7 +43,7 @@ def num_tokens_from_messages(messages, model="gpt-3.5-turbo"):
 See https://github.com/openai/openai-python/blob/main/chatml.md for information on how messages are converted to tokens.""")
 
 
-def read_tasks(cache_file="qas-5000.json"):
+def read_tasks(cache_file=None):
     #from make_qas import input_dir
     from make_qas_comparison import input_dir
     file = f"{input_dir}/qas.json"