Cannot get length controlled win rate

[FocusLiwen]

Hi,

I have installed alpaca_eval-0.6.6 patsy-1.0.1 using pip install git+https://github.com/tatsu-lab/alpaca_eval.
However, when I ran the following code, I got nan for length_controlled_winrate.

ANNOTATORS_CONFIG = "weighted_alpaca_eval_gpt4_turbo"

df_leaderboard, annotations = evaluate(  # type: ignore
    model_outputs=response_df,
    annotators_config=ANNOTATORS_CONFIG,
    is_return_instead_of_print=True,
    output_path="pneai_base",
).

What is the correct way to get length_controlled_winrate?

Thanks.