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plugins: don't directly set quant class (#34252)

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Signed-off-by: Devashish Lal <devcode@fb.com>
Co-authored-by: Devashish Lal <devcode@fb.com>
Co-authored-by: Alex Nails <alex.nails@radixark.ai>
This commit is contained in:
DevashishLal-CB
2026-08-10 16:01:31 -07:00
committed by GitHub
co-authored by Devashish Lal Alex Nails
parent b86c90215f
commit 0661eb1c50
1 changed files with 12 additions and 6 deletions
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python/sglang/srt/model_loader/weight_utils.py
+12 -6
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@@ -341,7 +341,9 @@ def get_quant_config(
# TODO: standardize the handling of online quantization with custom handlenames (mxfp8, quark_mxfp4, etc.)
if not possible_config_filenames:
if model_config.quantization == "mxfp8":
return Fp8Config(use_mxfp8=True, is_checkpoint_fp8_serialized=False)
if not issubclass(quant_cls, Fp8Config):
quant_cls = Fp8Config
return quant_cls(use_mxfp8=True, is_checkpoint_fp8_serialized=False)
if model_config.quantization == "quark_mxfp4":
return quant_cls(
online_scheme=model_config.quantization,
@@ -358,9 +360,9 @@ def get_quant_config(
if model_config.quantization == "modelopt_fp4":
# Without serialized metadata, quantize MoE expert weights online;
# leave dense layers in source precision.
return ModelOptFp4Config.for_online_weight_quantization(
packed_modules_mapping
)
if not issubclass(quant_cls, ModelOptFp4Config):
quant_cls = ModelOptFp4Config
return quant_cls.for_online_weight_quantization(packed_modules_mapping)
raise ValueError(f"Cannot find the config file for {model_config.quantization}")
if len(quant_config_files) > 1:
raise ValueError(
@@ -394,10 +396,14 @@ def get_quant_config(
)
return None
elif quant_algo == "FP8" or model_config.quantization == "modelopt_fp8":
return ModelOptFp8Config.from_config(config)
if not issubclass(quant_cls, ModelOptFp8Config):
quant_cls = ModelOptFp8Config
return quant_cls.from_config(config)
elif "FP4" in quant_algo:
if not issubclass(quant_cls, ModelOptFp4Config):
quant_cls = ModelOptFp4Config
return _resolve_explicit_draft_quant_config(
model_config, ModelOptFp4Config.from_config(config)
model_config, quant_cls.from_config(config)
)
return _resolve_explicit_draft_quant_config(
model_config, quant_cls.from_config(config)