mim install mmcv-full in the wrong venv.

When install the mmcv-full package use openmim, the package is installed in the wrong venv.

Reproduction

1. What command or script did you run? In the pytorch venv, running mim install mmcv-full, and then pip list command cannot find the package in this venv. After deactivating the pytorch venv use deactivate， the mmcv-full package appears.

Bug fix It seams that the mim install funcition cannot recognize the venv environment.

[DingYuan0118]

• first, use python -m venv test_mim to create a venv environment.
• second, use pip install torch==1.10.0+cu102 torchvision==0.11.1+cu102 torchaudio===0.10.0+cu102 -f https://download.pytorch.org/whl/cu102/torch_stable.html as pytorch.org suggested to install the pytorch
• then, use pip install openmim and mim install mmcv-full to install mmcv and it will show up a successfully installed message.
• last, use pip list in this venv, and you cannot find the installed mmcv package

[zhouzaida]

Thank you for your patience. I will try to reproduce the error.