我在安装cmake之后尝试通过pip安装dlib，出现以下错误。可能是什么原因造成的？
C:\Users\HP>pip install dlib
Collecting dlib
Using cached https://files.pythonhosted.org/packages/1e/62/aacb236d21fbd08148b1d517d58a9d80ea31bdcd386d26f21f8b23b1eb28/dlib-19.18.0.tar.gz
Installing collected packages: dlib
Running setup.py install for dlib ... error
ERROR: Command errored out with exit status 1:
command: 'c:\users\hp\appdata\local\programs\python\python37-32\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\HP\\AppData\\Local\\Temp\\pip-install-vi6lt4_a\\dlib\\setup.py'"'"'; __file__='"'"'C:\\Users\\HP\\AppData\\Local\\Temp\\pip-install-vi6lt4_a\\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 'C:\Users\HP\AppData\Local\Temp\pip-record-53508srf\install-record.txt' --single-version-externally-managed --compile
cwd: C:\Users\HP\AppData\Local\Temp\pip-install-vi6lt4_a\dlib\
Complete output (80 lines):
running install
running build
running build_py
package init file 'dlib\__init__.py' not found (or not a regular file)
running build_ext
Building extension for Python 3.7.4 (tags/v3.7.4:e09359112e, Jul 8 2019, 19:29:22) [MSC v.1916 32 bit (Intel)]
Invoking CMake setup: 'cmake C:\Users\HP\AppData\Local\Temp\pip-install-vi6lt4_a\dlib\tools\python -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=C:\Users\HP\AppData\Local\Temp\pip-install-vi6lt4_a\dlib\build\lib.win32-3.7 -DPYTHON_EXECUTABLE=c:\users\hp\appdata\local\programs\python\python37-32\python.exe -DCMAKE_LIBRARY_OUTPUT_DIRECTORY_RELEASE=C:\Users\HP\AppData\Local\Temp\pip-install-vi6lt4_a\dlib\build\lib.win32-3.7'
-- Building for: NMake Makefiles
-- The C compiler identification is unknown
-- The CXX compiler identification is unknown
CMake Error at CMakeLists.txt:3 (project):
The CMAKE_C_COMPILER:
cl
is not a full path and was not found in the PATH.
To use the NMake generator with Visual C++, cmake must be run from a shell
that can use the compiler cl from the command line. This environment is
unable to invoke the cl compiler. To fix this problem, run cmake from the
Visual Studio Command Prompt (vcvarsall.bat).
Tell CMake where to find the compiler by setting either the environment
variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
the compiler, or to the compiler name if it is in the PATH.
CMake Error at CMakeLists.txt:3 (project):
The CMAKE_CXX_COMPILER:
cl
is not a full path and was not found in the PATH.
To use the NMake generator with Visual C++, cmake must be run from a shell
that can use the compiler cl from the command line. This environment is
unable to invoke the cl compiler. To fix this problem, run cmake from the
Visual Studio Command Prompt (vcvarsall.bat).
Tell CMake where to find the compiler by setting either the environment
variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
to the compiler, or to the compiler name if it is in the PATH.
-- Configuring incomplete, errors occurred!
See also "C:/Users/HP/AppData/Local/Temp/pip-install-vi6lt4_a/dlib/build/temp.win32-3.7/Release/CMakeFiles/CMakeOutput.log".
See also "C:/Users/HP/AppData/Local/Temp/pip-install-vi6lt4_a/dlib/build/temp.win32-3.7/Release/CMakeFiles/CMakeError.log".
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "C:\Users\HP\AppData\Local\Temp\pip-install-vi6lt4_a\dlib\setup.py", line 261, in <module>
'Topic :: Software Development',
File "c:\users\hp\appdata\local\programs\python\python37-32\lib\site-packages\setuptools\__init__.py", line 145, in setup
return distutils.core.setup(**attrs)
File "c:\users\hp\appdata\local\programs\python\python37-32\lib\distutils\core.py", line 148, in setup
dist.run_commands()
File "c:\users\hp\appdata\local\programs\python\python37-32\lib\distutils\dist.py", line 966, in run_commands
self.run_command(cmd)
File "c:\users\hp\appdata\local\programs\python\python37-32\lib\distutils\dist.py", line 985, in run_command
cmd_obj.run()
File "c:\users\hp\appdata\local\programs\python\python37-32\lib\site-packages\setuptools\command\install.py", line 61, in run
return orig.install.run(self)
File "c:\users\hp\appdata\local\programs\python\python37-32\lib\distutils\command\install.py", line 545, in run
self.run_command('build')
File "c:\users\hp\appdata\local\programs\python\python37-32\lib\distutils\cmd.py", line 313, in run_command
self.distribution.run_command(command)
File "c:\users\hp\appdata\local\programs\python\python37-32\lib\distutils\dist.py", line 985, in run_command
cmd_obj.run()
File "c:\users\hp\appdata\local\programs\python\python37-32\lib\distutils\command\build.py", line 135, in run
self.run_command(cmd_name)
File "c:\users\hp\appdata\local\programs\python\python37-32\lib\distutils\cmd.py", line 313, in run_command
self.distribution.run_command(command)
File "c:\users\hp\appdata\local\programs\python\python37-32\lib\distutils\dist.py", line 985, in run_command
cmd_obj.run()
File "C:\Users\HP\AppData\Local\Temp\pip-install-vi6lt4_a\dlib\setup.py", line 135, in run
self.build_extension(ext)
File "C:\Users\HP\AppData\Local\Temp\pip-install-vi6lt4_a\dlib\setup.py", line 172, in build_extension
subprocess.check_call(cmake_setup, cwd=build_folder)
File "c:\users\hp\appdata\local\programs\python\python37-32\lib\subprocess.py", line 347, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['cmake', 'C:\\Users\\HP\\AppData\\Local\\Temp\\pip-install-vi6lt4_a\\dlib\\tools\\python', '-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=C:\\Users\\HP\\AppData\\Local\\Temp\\pip-install-vi6lt4_a\\dlib\\build\\lib.win32-3.7', '-DPYTHON_EXECUTABLE=c:\\users\\hp\\appdata\\local\\programs\\python\\python37-32\\python.exe', '-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_RELEASE=C:\\Users\\HP\\AppData\\Local\\Temp\\pip-install-vi6lt4_a\\dlib\\build\\lib.win32-3.7']' returned non-zero exit status 1.
----------------------------------------
ERROR: Command errored out with exit status 1: 'c:\users\hp\appdata\local\programs\python\python37-32\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\HP\\AppData\\Local\\Temp\\pip-install-vi6lt4_a\\dlib\\setup.py'"'"'; __file__='"'"'C:\\Users\\HP\\AppData\\Local\\Temp\\pip-install-vi6lt4_a\\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 'C:\Users\HP\AppData\Local\Temp\pip-record-53508srf\install-record.txt' --single-version-externally-managed --compile Check the logs for full command output.