transformers

a989c6c6 - Don't allow passing `load_in_8bit` and `load_in_4bit` at the same time (#28266)

Don't allow passing `load_in_8bit` and `load_in_4bit` at the same time (#28266) * Update quantization_config.py * Style * Protect from setting directly * add tests * Update tests/quantization/bnb/test_4bit.py Co-authored-by: Younes Belkada <49240599+younesbelkada@users.noreply.github.com> --------- Co-authored-by: Younes Belkada <49240599+younesbelkada@users.noreply.github.com>