Add JinaChat to the leaderboards

[jupyterjazz]

JinaChat Evaluation

PR includes JinaChat evaluation on AlpacaEval dataset using both gpt4 and claude evaluators.

Instructions to evaluate the model

Set JinaChat api key as an env variable

export JINA_CHAT_API_KEY=<key>

and run

alpaca_eval evaluate_from_model --model_configs 'jina-chat' --annotators_config <annotator_name>

[YannDubs]

price is not 0. Pleasier either:

• use [np.nan] * len(completions) to say that the price is not given
  or
• (better) use the estimated price which seems to be approximately [0 if len(c) < 100 else 0.08 for c in completions]

[jupyterjazz]

Following the standard package, I calculate pricing in the following way:

if msg tokens is more than 300, price is 0.08
otherwise 0

[YannDubs]

Thanks for the contribution, JinaChar seems like a cool project/product!

Please make the few small changes above and I'll merge

[jupyterjazz]

@YannDubs suggestions applied! can you take a look again? thx

[YannDubs]

LGTM although I don't have access to the API key so I can't test.
Merging, thanks!