Traceback (most recent call last):


 "/usr/lib/python3/dist-packages/urllib3/contrib/pyopenssl.py", line 417, in wrap_socket

cnx.do_handshake()


 "/usr/local/lib/python3.5/dist-packages/OpenSSL/SSL.py", line 1915, in do_handshake

self._raise_ssl_error(self._ssl, result)


 "/usr/local/lib/python3.5/dist-packages/OpenSSL/SSL.py", line 1647, in _raise_ssl_error

_raise_current_error()


 "/usr/local/lib/python3.5/dist-packages/OpenSSL/_util.py", line 54, in exception_from_error_queue

raise exception_type(errors)
OpenSSL.SSL.Error: [('SSL routines', 'tls_process_server_certificate', 'certificate verify failed')]

Traceback (most recent call last):


 "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 209, in main

status = self.run(options, args)


 "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 335, in run

prefix=options.prefix_path,


 "/usr/lib/python2.7/dist-packages/pip/req/req_set.py", line 732, in install

**kwargs


 "/usr/lib/python2.7/dist-packages/pip/req/req_install.py", line 886, in install

spinner=spinner,


 "/usr/lib/python2.7/dist-packages/pip/utils/__init__.py", line 736, in call_subprocess

% (command_desc, proc.returncode, cwd))
InstallationError: Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-wrtVwH/horovod/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-7mUT3A-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-wrtVwH/horovod/
