[Doc]: Marlin does not support weight_bits = uint4b8

[xiaotukuaipao12318]

📚 The doc issue

使用 python -m vllm.entrypoints.openai.api_server --host 0.0.0.0 --port 17003 --model /data/Qwen2-7B-Instruct-GPTQ-Int4 --served-model-name Qwen 命令 加载下载的Qwen2-7B-Instruct-GPTQ-Int4模型时，显示Marlin 量化异常。
错误如下：
lf.model = get_model(model_config=self.model_config,
File "/usr/local/lib/python3.10/dist-packages/vllm/model_executor/model_loader/init.py", line 21, in get_model
return loader.load_model(model_config=model_config,
File "/usr/local/lib/python3.10/dist-packages/vllm/model_executor/model_loader/loader.py", line 324, in load_model
model = _initialize_model(model_config, self.load_config,
File "/usr/local/lib/python3.10/dist-packages/vllm/model_executor/model_loader/loader.py", line 152, in _initialize_model
quant_config = _get_quantization_config(model_config, load_config)
File "/usr/local/lib/python3.10/dist-packages/vllm/model_executor/model_loader/loader.py", line 93, in _get_quantization_config
quant_config = get_quant_config(model_config, load_config)
File "/usr/local/lib/python3.10/dist-packages/vllm/model_executor/model_loader/weight_utils.py", line 132, in get_quant_config
return quant_cls.from_config(hf_quant_config)
File "/usr/local/lib/python3.10/dist-packages/vllm/model_executor/layers/quantization/gptq_marlin.py", line 84, in from_config
return cls(weight_bits, group_size, desc_act, is_sym,
File "/usr/local/lib/python3.10/dist-packages/vllm/model_executor/layers/quantization/gptq_marlin.py", line 51, in init
verify_marlin_supported(quant_type=self.quant_type,
File "/usr/local/lib/python3.10/dist-packages/vllm/model_executor/layers/quantization/utils/marlin_utils.py", line 88, in verify_marlin_supported
raise ValueError(err_msg)
ValueError: Marlin does not support weight_bits = uint4b8. Only types = [] are supported (for group_size = 128, min_capability = 75, zp = False).

Suggest a potential alternative/fix

No response

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[youkaichao]

cc @mgoin

[mgoin]

Based on min_capability = 75 is it the case that you are using a T4 GPU? This should be failing before getting to this point since Marlin only supports >=80

[mgoin]

Thanks for finding this issue, I have resolved it in the attached PR above ^