Input token count and output token count are swapped for google_genai

[MalikS-343]

Description

Hi,

In ecologits/ecologits/tracers/google_genai_tracer.py, the input token count and output token count are defined as:

    input_tokens = response.usage_metadata.candidates_token_count
    output_tokens = response.usage_metadata.total_token_count - input_tokens

However, response.usage_metadata.candidates_token_count represents the number of generated tokens in the response. This value is assigned to input_tokens instead of output_tokens. Therefore, the input token count and output token count are swapped.

I could be wrong, but I was very surprised when I saw that the Gemini emissions were much higher than the estimated values from the online Ecologits Calculator. I changed the lines of code above locally to this:

    output_tokens = response.usage_metadata.candidates_token_count
    input_tokens = response.usage_metadata.total_token_count - output_tokens 

and I got more plausible results.

Example Code

[MalikS-343]

The problematic lines of code are present at line 44 and line 145.

[samuelrince]

Hey @MalikS-343 thank you for reporting this issue! We made a fix in #223 it will be released next week in the version 0.10.1 of EcoLogits.