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Add a token usage callback mechanism #9

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@peebles peebles commented May 20, 2024

    const stream = await LLM("the color is the sky is", {
        usage: async ({prompt_tokens, completion_tokens}) => {
            console.log(`Prompt token count: ${prompt_tokens}, completion token count: ${completion_tokens}`)
        }
    });

Add an option usage() callback to return prompt and completion token usage for those services that support it, currently implemented for Ollama and OpenAI client services. Works for both streaming and non-streaming.

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