fatal: unable to access ‘https://github.com/open-mmlab/mmcv.git/‘: gnutls_handshake() failed: The TL
fatal: unable to access ‘https://github.com/open-mmlab/mmcv.git/’: gnutls_handshake() failed: The TLS connection was non-properly terminated.解决办法:这个链接是解决办法,亲测