主要是安装dlib失败

可以先安装cmake（直接pip install cmake）

pip3 install cmake -i https://pypi.tuna.tsinghua.edu.cn/simple

,然后就可以直接pip install face_recognition就不会报错

pip3 install face_recognition -i https://pypi.tuna.tsinghua.edu.cn/simple

如果出现如下错误

  Scanning dependencies of target _dlib_pybind11
    [ 80%] Building CXX object CMakeFiles/_dlib_pybind11.dir/src/dlib.cpp.o
    In file included from /tmp/pip-build-s4h1d7z9/dlib/dlib/external/pybind11/include/pybind11/pytypes.h:12,
                     from /tmp/pip-build-s4h1d7z9/dlib/dlib/external/pybind11/include/pybind11/cast.h:13,
                     from /tmp/pip-build-s4h1d7z9/dlib/dlib/external/pybind11/include/pybind11/attr.h:13,
                     from /tmp/pip-build-s4h1d7z9/dlib/dlib/external/pybind11/include/pybind11/pybind11.h:43,
                     from /tmp/pip-build-s4h1d7z9/dlib/dlib/../dlib/python/pybind_utils.h:6,
                     from /tmp/pip-build-s4h1d7z9/dlib/dlib/../dlib/python.h:6,
                     from /tmp/pip-build-s4h1d7z9/dlib/tools/python/src/opaque_types.h:6,
                     from /tmp/pip-build-s4h1d7z9/dlib/tools/python/src/dlib.cpp:4:
    /tmp/pip-build-s4h1d7z9/dlib/dlib/external/pybind11/include/pybind11/detail/common.h:111:10: 致命错误：Python.h：没有那个文件或目录
     #include <Python.h>
              ^~~~~~~~~~
    编译中断。
    gmake[2]: *** [CMakeFiles/_dlib_pybind11.dir/build.make:82：CMakeFiles/_dlib_pybind11.dir/src/dlib.cpp.o] 错误 1
    gmake[1]: *** [CMakeFiles/Makefile2:136：CMakeFiles/_dlib_pybind11.dir/all] 错误 2
    gmake: *** [Makefile:103：all] 错误 2
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-s4h1d7z9/dlib/setup.py", line 262, in <module>
        'Topic :: Software Development',
      File "/usr/lib/python3.6/site-packages/setuptools/__init__.py", line 129, in setup
        return distutils.core.setup(**attrs)
      File "/usr/lib64/python3.6/distutils/core.py", line 148, in setup
        dist.run_commands()
      File "/usr/lib64/python3.6/distutils/dist.py", line 955, in run_commands
        self.run_command(cmd)
      File "/usr/lib64/python3.6/distutils/dist.py", line 974, in run_command
        cmd_obj.run()
      File "/usr/lib/python3.6/site-packages/setuptools/command/install.py", line 61, in run
        return orig.install.run(self)
      File "/usr/lib64/python3.6/distutils/command/install.py", line 556, in run
        self.run_command('build')
      File "/usr/lib64/python3.6/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/usr/lib64/python3.6/distutils/dist.py", line 974, in run_command
        cmd_obj.run()
      File "/usr/lib64/python3.6/distutils/command/build.py", line 135, in run
        self.run_command(cmd_name)
      File "/usr/lib64/python3.6/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/usr/lib64/python3.6/distutils/dist.py", line 974, in run_command
        cmd_obj.run()
      File "/tmp/pip-build-s4h1d7z9/dlib/setup.py", line 135, in run
        self.build_extension(ext)
      File "/tmp/pip-build-s4h1d7z9/dlib/setup.py", line 175, in build_extension
        subprocess.check_call(cmake_build, cwd=build_folder)
      File "/usr/lib64/python3.6/subprocess.py", line 311, in check_call
        raise CalledProcessError(retcode, cmd)
    subprocess.CalledProcessError: Command '['cmake', '--build', '.', '--config', 'Release', '--', '-j1']' returned non-zero exit status 2.

    ----------------------------------------
Command "/usr/bin/python3.6 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-s4h1d7z9/dlib/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-r8s0jfwr-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-s4h1d7z9/dlib/

请先安装 python36-devel 

yum install python36-devel