[WIP] Download lora from modelscope when VLLM_USE_MODELSCOPE is true

[kerthcet]

xref: #6234

With #6234, we can donwload the loras dynamically from HF, however, once people set the environment VLLM_USE_MODELSCOPE=true, we should download the loras from MS as well.

It's counterintuitive to download the model from one hub, but lora from another hub.

If this is acceptable, I'll continue the work, like adding tests. cc @Jeffwan @Yard1 as the original author and reviewer.

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[jeejeelee]

See: #10762

[kerthcet]

See: #10762

Thanks for the response, I read the comments but seems no conclusion yet. From my point of view, if we set the VLLM_USE_MODELSCOPE=true, we're switching from HF to MS, then both the models and loras should from the same source, I believe this is the default semantic of the env variable VLLM_USE_MODELSCOPE, or we need to update the document which noted as:

By default, vLLM downloads models from HuggingFace. 
If you would like to use models from ModelScope, 
set the environment variable VLLM_USE_MODELSCOPE before initializing the engine.

Regarding to the download problem, HF is under the same situation I think. My two cents. wdyt?

[jeejeelee]

HF is under the same situation I think

We have tested locally, and this situation doesn't exist on HF.

Previously, we were concerned about the risk of lora service crashes during loading, but after merging #12102 and #11727 , I think we can consider supporting downloads from MODELSCOPE

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