[Bug]: cannot import name 'PretrainedConfig' from partially initialized module 'transformers.configuration_utils'

[vincentyan2023]

Your current environment

The output of python collect_env.py

raise the error:
ImportError: cannot import name 'PretrainedConfig' from partially initialized module 'transformers.configuration_utils' (most likely due to a circular import)

Your output of `python collect_env.py` here

version : 1Cat-vLLM-1.0.0

when run :

python -m vllm.entrypoints.openai.api_server
--model /home/yan/Model/qwen3.6-27b
--served-model-name qwen3.6-27b-awq-mtp
--trust-remote-code
--tensor-parallel-size 1
--enable-auto-tool-choice
--tool-call-parser qwen3_coder
--speculative-config '{"method":"mtp","num_speculative_tokens":2}'
--host 0.0.0.0
--port 8765

🐛 Describe the bug

cannot import name 'PretrainedConfig' from partially initialized module 'transformers.configuration_utils'

Before submitting a new issue...

• Make sure you already searched for relevant issues, and asked the chatbot living at the bottom right corner of the documentation page, which can answer lots of frequently asked questions.