[Bug]: Gemini breaks when passing presence_penalty or frequency_penalty parameters

[toniengelhardt]

What happened?

I don't know exactly when that changed, but passing presence_penalty and frequency_penalty parameters to gemini models (e.g. gemini/gemini-1.5-flash-latest) in completion() used to work, now it leads to a BadRequestError like:

While the parameters are still listed in the Vertex AI docs, they are not listed anymore in the Gemini/GenerativeAI docs.

Expected behavior would be to either map the parameters to an equivalent or avoid the error when drop_params is True.

Not passing the parameters solves the problem.

Relevant log output

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