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fix(gguf): Disable bfloat16 for GGUF on blackwell device (#30408)

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Signed-off-by: Christina <truffle@gmail.com>
Signed-off-by: Isotr0py <2037008807@qq.com>
Signed-off-by: Christina Norman <christina@example.com>
Co-authored-by: Isotr0py <isotr0py@users.noreply.github.com>
Co-authored-by: Isotr0py <2037008807@qq.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
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Christina Norman 2025-12-12 09:10:12 -06:00 committed by GitHub
parent 3e34adcdfb
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6
vllm/model_executor/layers/quantization/gguf.py
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@ -33,6 +33,7 @@ from vllm.model_executor.layers.vocab_parallel_embedding import (
)
from vllm.model_executor.models.utils import WeightsMapper
from vllm.model_executor.utils import set_weight_attrs
from vllm.platforms import current_platform
from vllm.utils.torch_utils import direct_register_custom_op
logger = init_logger(__name__)
@ -52,6 +53,11 @@ class GGUFConfig(QuantizationConfig):
return "gguf"
def get_supported_act_dtypes(self) -> list[torch.dtype]:
# GGUF dequantization kernels use half precision (fp16) internally.
# bfloat16 has precision issues on Blackwell devices.
if current_platform.has_device_capability(100):
logger.warning_once("GGUF has precision issues with bfloat16 on Blackwell.")
return [torch.half, torch.float32]
return [torch.half, torch.bfloat16, torch.float32]
@classmethod