[Installation]: cannot install vllm with openvino backend

[guanxiang]

Your current environment

ERROR: Cannot install openvino-tokenizers[transformers]==2024.4.0.0, optimum-intel and vllm==0.6.3.dev100+g15986f59.openvino because these package versions have conflicting dependencies.

The conflict is caused by:
    vllm 0.6.3.dev100+g15986f59.openvino depends on transformers>=4.45.0
    openvino-tokenizers[transformers] 2024.4.0.0 depends on transformers>=4.36.0; extra == "transformers"
    optimum-intel 1.19.0 depends on transformers<4.45 and >=4.36

To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip to attempt to solve the dependency conflict

ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/topics/dependency-resolution/#dealing-with-dependency-conflicts

How you are installing vllm

git clone https://github.com/vllm-project/vllm.git
cd vllm
pip install -r requirements-build.txt --extra-index-url https://download.pytorch.org/whl/cpu
PIP_EXTRA_INDEX_URL="https://download.pytorch.org/whl/cpu" VLLM_TARGET_DEVICE=openvino python -m pip install -v .
follow the offical step
https://docs.vllm.ai/en/latest/getting_started/openvino-installation.html

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[DarkLight1337]

Can you test out #9121 and see if it enables you to install the latest vLLM?