A reminder for the frequent error regarding openai_key in the evaluate #1781
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During the invocation of the evaluate function, I observed a common issue: when users do not pass in their custom LLM (Large Language Model), the function automatically attempts to call OpenAI's model. However, if the user has not set the OPENAI_API_KEY environment variable at this point, it will cause the function to fail and throw an error. To address this problem and enhance user experience, I have introduced a new feature to remind users to set their API key.