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[Quantization]: Support compressed-tensors mixed-precision model loading (#22468)

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Signed-off-by: Dipika Sikka <dipikasikka1@gmail.com>
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Dipika Sikka 2025-08-14 17:32:09 -04:00 committed by GitHub
parent 279a5f31b3
commit 4121de512e
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1 changed files with 20 additions and 5 deletions
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25
vllm/model_executor/layers/quantization/compressed_tensors/compressed_tensors.py
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@ -192,7 +192,15 @@ class CompressedTensorsConfig(QuantizationConfig):
quant_config.get("weights"))
target_scheme_map[target]["input_activations"] = None
if is_activation_quantization_format(quant_format):
target_scheme_map[target]["format"] = quant_config.get(
"format")
format = target_scheme_map[target].get("format")
# If no per-config format defined, use global format in config
act_quant_format = is_activation_quantization_format(
format
) if format is not None else is_activation_quantization_format(
quant_format)
if act_quant_format:
input_activations = quant_config.get("input_activations")
# The only case where we have activation quant supported
# but no input_activations provided in the config
@ -389,8 +397,10 @@ class CompressedTensorsConfig(QuantizationConfig):
return (is_channel_group and input_quant_none and is_static)
def _get_scheme_from_parts(
self, weight_quant: BaseModel,
input_quant: BaseModel) -> "CompressedTensorsScheme":
self,
weight_quant: BaseModel,
input_quant: BaseModel,
format: Optional[str] = None) -> "CompressedTensorsScheme":
# Detect If Mixed Precision
if self._is_fp4a16_nvfp4(weight_quant, input_quant):
return CompressedTensorsW4A16Fp4()
@ -412,7 +422,11 @@ class CompressedTensorsConfig(QuantizationConfig):
group_size=weight_quant.group_size,
actorder=weight_quant.actorder)
if is_activation_quantization_format(self.quant_format):
act_quant_format = is_activation_quantization_format(
format
) if format is not None else is_activation_quantization_format(
self.quant_format)
if act_quant_format:
if self._is_fp4a4_nvfp4(weight_quant, input_quant):
if cutlass_fp4_supported(
) or envs.VLLM_USE_NVFP4_CT_EMULATIONS:
@ -507,6 +521,7 @@ class CompressedTensorsConfig(QuantizationConfig):
scheme_dict = self.target_scheme_map[matched_target]
weight_quant = scheme_dict.get("weights")
input_quant = scheme_dict.get("input_activations")
format = scheme_dict.get("format")
# Find the sparsity scheme of the layer
# assume that fused layers inerhit first component's sparsity scheme
@ -547,7 +562,7 @@ class CompressedTensorsConfig(QuantizationConfig):
scheme = self._get_scheme_from_parts( # type: ignore
weight_quant=weight_quant,
input_quant=input_quant,
)
format=format)
# Raise error if device does not support the scheme
# (e.g. fp8 needs ada lovelace)