安装mmcv报错 ERROR: Could not find a version that satisfies the requirement Cython (from versions: none)

解决
pip install cython

还是会出错但是报错变成
ERROR: Could not find a version that satisfies the requirement pytest-runner (from versions: none)
ERROR: No matching distribution found for pytest-runner

继续
pip install pytest-runner

再安装mmcv就可以了

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