[Misc][Platform] Improve log info

[wangxiyuan]

Print the error info when failed to load platform during initialization. It helps user to get the origin info clear.

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[youkaichao]

i don't think it helps here?

[wangxiyuan]

This is used for print error stack for detail info. For example, the error raise by

vllm/vllm/platforms/__init__.py

Line 68 in 51010a1

raise e

will be catch here.

I change it to debug level to keep the same with other logger.

[youkaichao]

we can add some debug level logging in functions like

vllm/vllm/platforms/__init__.py

Line 48 in f90a375

def cuda_platform_plugin() -> Optional[str]:

and then, at

vllm/vllm/platforms/__init__.py

Line 212 in f90a375

"No platform detected, vLLM is running on UnspecifiedPlatform")

we can have one more line to tell users to turn on debug logging if the detected platform is not correct.

[wangxiyuan]

we can add some debug level logging in functions like

vllm/vllm/platforms/__init__.py

Line 48 in f90a375

def cuda_platform_plugin() -> Optional[str]:

and then, at

vllm/vllm/platforms/__init__.py

Line 212 in f90a375

"No platform detected, vLLM is running on UnspecifiedPlatform")

we can have one more line to tell users to turn on debug logging if the detected platform is not correct.

Nice way. I added more log. Please take a look again. Thanks.

[youkaichao]

finished in #14195 . thanks for the initiative!