When I installed package vllm==0.1.4.
It turned out that"Collecting torch>=2.0.0 (from vllm==0.1.4)"
which didn't meet your environment
conda install pytorch==1.12.0 torchvision==0.13.0 torchaudio==0.12.0 cudatoolkit=11.3 -c pytorch.
The installation process of vllm==0.1.4 automaticly uninstall the old version of pytorch==1.12.0 and install the new version of pytorch.
When I installed package vllm==0.1.4. It turned out that"Collecting torch>=2.0.0 (from vllm==0.1.4)" which didn't meet your environment
conda install pytorch==1.12.0 torchvision==0.13.0 torchaudio==0.12.0 cudatoolkit=11.3 -c pytorch
.The installation process of vllm==0.1.4 automaticly uninstall the old version of pytorch==1.12.0 and install the new version of pytorch.