Human written

Google's collections:

https://huggingface.co/collections/google/gemma-4-qat-q4-0

https://huggingface.co/collections/google/gemma-4-qat-mobile

And Unsloth's:

https://huggingface.co/collections/unsloth/gemma-4-qat

Unsloth's analysis (KLD and such):

https://unsloth.ai/docs/models/gemma-4/qat#qat-analysis