[Bugfix]Fix transformer backend failed: AttributeError: 'Parameter' object has no attribute 'weight_loader'#48699
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Yejing-Lai wants to merge 1 commit into
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[Bugfix]Fix transformer backend failed: AttributeError: 'Parameter' object has no attribute 'weight_loader'#48699Yejing-Lai wants to merge 1 commit into
Yejing-Lai wants to merge 1 commit into
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Signed-off-by: Lai, Yejing <yejing.lai@intel.com>
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Reproduce:
python3 -m vllm.entrypoints.openai.api_server --model deepseek-ai/DeepSeek-R1-Distill-Llama-8B --enforce-eager --port 8000 --host 0.0.0.0 --model_impl transformers --trust-remote-code --gpu-memory-util=0.9 --no-enable-prefix-caching --max-num-batched-tokens=8192 --max-model-len=8192 --quantization fp8
will meet transformer backend failed: AttributeError: 'Parameter' object has no attribute 'weight_loader'
Root cause:
init_parameters() replace every meta parameter with the nn nn.Parameter and discarding the original parameter object along with its weight_loader.
Fix:
skips re-materializing any meta parameter that already carries a weight_loader, since that indicates it's owned by a quant method that will lazily fill it during weight loading.