In prep for fine tuned models support for function calls what would training data look like?

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Thank you for your reply.
In case you have not seen this topic, it may be off interest:

Function Calling - Return Multiple Objects

When applying Function Calling, is there a way to have ChatCompletions model return multiple objects? Use the get_current_weather() function as an example (as in OpenAI official guide). When the user query is: "What's the weather like in Boston, and what's the weather in Houston?" How can I let GPT return [{'location': 'Boston, MA'}, {'location': 'Houston, TX'}]?

I believe your main challenge will be the large amount of parameters or functions that the model will have to handle reliably.