ubuntu安装dlib系列问题的解决方案

dlib在人脸的很多代码中用到。
在ubuntu上安装的时候关于dlib遇到了一些问题，以下将适用自己的解决方案做一个整理记录。
主要使用conda的虚拟环境

遇到的问题做了个汇总，是因为一个个解决了以后总有下一个问题，最后是用一个总的方案这些问题都消失了。

问题汇总

1. conda找不到dlib库

可能是源的问题

conda install -c menpo dlib
# 或者
pip install dlib

2. conda创建的虚拟环境无法安装dlib

报错信息为：

    RuntimeError:
    *******************************************************************
     CMake must be installed to build the following extensions: dlib
    *******************************************************************

3. conda创建的虚拟环境无法安装dlib

报错信息为

1 error detected in the compilation of "/tmp/tmpxft_0002b980_00000000-6_cuda_dlib.cpp1.ii".
    CMake Error at dlib_generated_cuda_dlib.cu.o.Release.cmake:279 (message):
      Error generating file
      /tmp/pip-install-1mezk9zs/dlib/build/temp.linux-x86_64-3.8/dlib_build/CMakeFiles/dlib.dir/cuda/./dlib_generated_cuda_dlib.cu.o


    dlib_build/CMakeFiles/dlib.dir/build.make:63: recipe for target 'dlib_build/CMakeFiles/dlib.dir/cuda/dlib_generated_cuda_dlib.cu.o' failed
    make[2]: *** [dlib_build/CMakeFiles/dlib.dir/cuda/dlib_generated_cuda_dlib.cu.o] Error 1
    make[2]: *** Waiting for unfinished jobs....
    CMakeFiles/Makefile2:145: recipe for target 'dlib_build/CMakeFiles/dlib.dir/all' failed
    make[1]: *** [dlib_build/CMakeFiles/dlib.dir/all] Error 2
    Makefile:83: recipe for target 'all' failed
    make: *** [all] Error 2
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-1mezk9zs/dlib/setup.py", line 223, in <module>
        setup(
      File "/opt/conda/envs/torch1.5/lib/python3.8/site-packages/setuptools/__init__.py", line 144, in setup
        return distutils.core.setup(**attrs)
      File "/opt/conda/envs/torch1.5/lib/python3.8/distutils/core.py", line 148, in setup
        dist.run_commands()
      File "/opt/conda/envs/torch1.5/lib/python3.8/distutils/dist.py", line 966, in run_commands
        self.run_command(cmd)
      File "/opt/conda/envs/torch1.5/lib/python3.8/distutils/dist.py", line 985, in run_command
        cmd_obj.run()
      File "/opt/conda/envs/torch1.5/lib/python3.8/site-packages/setuptools/command/install.py", line 61, in run
        return orig.install.run(self)
      File "/opt/conda/envs/torch1.5/lib/python3.8/distutils/command/install.py", line 545, in run
        self.run_command('build')
      File "/opt/conda/envs/torch1.5/lib/python3.8/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/opt/conda/envs/torch1.5/lib/python3.8/distutils/dist.py", line 985, in run_command
        cmd_obj.run()
      File "/opt/conda/envs/torch1.5/lib/python3.8/distutils/command/build.py", line 135, in run
        self.run_command(cmd_name)
      File "/opt/conda/envs/torch1.5/lib/python3.8/distutils/cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "/opt/conda/envs/torch1.5/lib/python3.8/distutils/dist.py", line 985, in run_command
        cmd_obj.run()
      File "/tmp/pip-install-1mezk9zs/dlib/setup.py", line 135, in run
        self.build_extension(ext)
      File "/tmp/pip-install-1mezk9zs/dlib/setup.py", line 175, in build_extension
        subprocess.check_call(cmake_build, cwd=build_folder)
      File "/opt/conda/envs/torch1.5/lib/python3.8/subprocess.py", line 364, in check_call
        raise CalledProcessError(retcode, cmd)
    subprocess.CalledProcessError: Command '['cmake', '--build', '.', '--config', 'Release', '--', '-j80']' returned non-zero exit status 2.
    ----------------------------------------
ERROR: Command errored out with exit status 1: /opt/conda/envs/torch1.5/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-1mezk9zs/dlib/setup.py'"'"'; __file__='"'"'/tmp/pip-install-1mezk9zs/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-record-t54jnsix/install-record.txt --single-version-externally-managed --compile --install-headers /opt/conda/envs/torch1.5/include/python3.8/dlib Check the logs for full command output.

4. 从dlib源码安装的报错

cmake和python setup.py均有报错，报错信息为

[  1%] Building NVCC (Device) object dlib/CMakeFiles/dlib.dir/cuda/dlib_generated_cuda_dlib.cu.o
/home/alex/Desktop/dlib/dlib/cuda/cuda_dlib.cu(1691): error: calling a constexpr __host__ function("log1p") from a __device__ function("cuda_log1pexp") is not allowed. The experimental flag '--expt-relaxed-constexpr' can be used to allow this.

1 error detected in the compilation of "/tmp/tmpxft_0000635c_00000000-6_cuda_dlib.cpp1.ii".
CMake Error at dlib_generated_cuda_dlib.cu.o.Release.cmake:279 (message):
  Error generating file
  /home/alex/Desktop/dlib/build/dlib/CMakeFiles/dlib.dir/cuda/./dlib_generated_cuda_dlib.cu.o


dlib/CMakeFiles/dlib.dir/build.make:583: recipe for target 'dlib/CMakeFiles/dlib.dir/cuda/dlib_generated_cuda_dlib.cu.o' failed
make[2]: *** [dlib/CMakeFiles/dlib.dir/cuda/dlib_generated_cuda_dlib.cu.o] Error 1
CMakeFiles/Makefile2:93: recipe for target 'dlib/CMakeFiles/dlib.dir/all' failed
make[1]: *** [dlib/CMakeFiles/dlib.dir/all] Error 2
Makefile:151: recipe for target 'all' failed
make: *** [all] Error 2

5. 使用conda安装dlib，opencv，pillow之后，opencv提示找不到

报错信息为

no module named cv2

解决方案

1. 全部使用conda的解决方案

apt install cmake
conda create -n tf1.14 python=3.6
source activate tf1.14
conda install tensorflow-gpu=1.14 keras=2.3
conda install -c menpo dlib # dlib需要先安装，后装就有BUG了
conda install pillow
pip install opencv-python # opencv使用conda里的pip装
conda install requests tqdm

2. 从源码安装dlib的解决方案

apt install cmake # 先装cmake总是对的
git clone https://github.com/davisking/dlib.git
cd dlib
mkdir build
cd build
cmake .. -DDLIB_USE_CUDA=1 -DUSE_AVX_INSTRUCTIONS=1 -DCUDA_NVCC_FLAGS="--expt-relaxed-constexpr"
cmake --build . --config Release
python setup.py install --set DLIB_USE_CUDA=1 --set USE_AVX_INSTRUCTIONS=1 --set CUDA_NVCC_FLAGS="--expt-relaxed-constexpr" #我的python是链接到conda环境里的python的

参考

https://github.com/ageitgey/face_recognition/issues/1039