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Revert some breaking changes bnb #41581

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Merged
SunMarc merged 1 commit into from
Oct 14, 2025
Merged

Revert some breaking changes bnb #41581

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12 changes: 5 additions & 7 deletions src/transformers/quantizers/auto.py
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Original file line number Diff line number Diff line change
Expand Up @@ -121,17 +121,15 @@ class AutoQuantizationConfig:
@classmethod
def from_dict(cls, quantization_config_dict: dict):
quant_method = quantization_config_dict.get("quant_method")
if quant_method is None:
# We need a special care for bnb models to make sure everything is BC ..
if quantization_config_dict.get("load_in_8bit", False) or quantization_config_dict.get("load_in_4bit", False):
suffix = "_4bit" if quantization_config_dict.get("load_in_4bit", False) else "_8bit"
quant_method = QuantizationMethod.BITS_AND_BYTES + suffix
elif quant_method is None:
raise ValueError(
"The model's quantization config from the arguments has no `quant_method` attribute. Make sure that the model has been correctly quantized"
)

if quant_method == QuantizationMethod.BITS_AND_BYTES:
if quantization_config_dict.get("load_in_8bit"):
quant_method += "_8bit"
else:
quant_method += "_4bit"

if quant_method not in AUTO_QUANTIZATION_CONFIG_MAPPING:
raise ValueError(
f"Unknown quantization type, got {quant_method} - supported types are:"
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