问题描述
我目前正在使用 METIS 的 python 中运行源代码.我想使用 Jetbrains PyCharm、conda 解释器运行它，这些都安装在 Windows 10 上.虽然我使用 conda 安装了 METIS，但我无法启用共享库，我遇到了这个错误:
I am currently running a source code in python which uses METIS. I wanted to run it using Jetbrains PyCharm, conda interpreter and these are installed on windows 10. Although I have installed METIS using conda, I could not enable shared libraries and I faced this error:
ModuleNotFoundError: 没有名为metis"的模块
ModuleNotFoundError: No module named 'metis'
当我尝试在没有 conda 的情况下运行它时，我遇到了以下错误，尽管我已将 metis.dll 位置添加到环境变量中.
When I tried to run it without conda I faced the following error although I have added the metis.dll location to the environment variables.
运行时错误:无法加载 METIS dll
RuntimeError: Could not load METIS dll
有人可以帮我吗?
推荐答案
这个问题很老了，但我遇到了同样的问题，在陷入困境之后......太久了......我有一个有效的答案对我来说.
This question is old, but I ran into the same problem and after going down the rabbit's hole for.. too long... I have an answer that worked for me.
首先，您应该使用 pip 获取 python metis 包装器:pip install metis.
First, you should get the python metis wrapper using pip: pip install metis.
第二，你必须安装 conda-metis，你可以在这里找到.虽然pip调用了metis python包装器metis，但它只是metis包装器，本身并没有metis.
Second, You must install conda-metis, which you can find here. Although pip calls the metis python wrapper metis, it just the metis wrapper and does not have metis itself.
将 conda-metis-master 中的文件放在某个文件路径中.
Place the files in conda-metis-master in some file path.
安装需要一些修复.确保您拥有最新版本的 Visual Studios(我使用的是 2017).对我来说，VS 在运行 BUILD-WINDOWS.txt 中的指令时遇到了问题，这让我想到了这个线程:
The installation requires some fixes. Make sure you have a recent version of Visual Studios (I used 2017). For me, VS had a problem running the instructions in BUILD-WINDOWS.txt, which landed me on this thread:
为什么 MSBuild 在 C:\ 中查找 Microsoft.Cpp.Default.props 而不是 c:\Program Files (x86)\MSBuild?(错误 MSB4019)
具体来说，答案对于 Windows 10 上的 Visual Studio 2017 和 2019 是我所采用的.运行:
Specifically, the answer For Visual Studio 2017 and 2019 on Windows 10 was what I went with. Run:
set VCTargetPaths=C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\IDE\VC\VCTargets
在具有设置环境变量的完全权限的命令提示符下.
in command prompt with full permissions to set the environment variable.
同时转到注册表编辑器中的 Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild\ 并在 4.0 中更改变量 MSBuildOverrideTasksPath 和 >ToolsVersion\4.0\ 变量 MSBuildToolPath 到 C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin.
Also go to Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild\ in regedit and change in 4.0 the variable MSBuildOverrideTasksPath and in ToolsVersion\4.0\ the variable MSBuildToolPath to C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\15.0\Bin.
对于python metis，我们需要一个.dll，而不是.lib[1]，所以我们还必须仔细查看CMakeLists.txt(请参阅此讨论的 Linux 版本 这里).我们在第 19 行添加:set(METIS_LIBRARY_TYPE SHARED).
For the python metis, we need a .dll, not .lib[1], so we must also look closer at the CMakeLists.txt (see the Linux version of this discussion here). We add on line 19: set(METIS_LIBRARY_TYPE SHARED).
您应该按照 BUILD-WINDOWS.txt 说明进行操作，但在命令提示符中的 conda-metis 文件路径中以完全权限运行 .\vsgen -G "Visual Studio 15 2017 Win64" 而不是使用 Visual Studio 10.
You should follow the BUILD-WINDOWS.txt instructions, but run .\vsgen -G "Visual Studio 15 2017 Win64" inside your conda-metis file path in command prompt with full permissions instead of using Visual Studio 10.
等等！在遵循有关使用 VS 构建库的进一步说明之前，我们需要另一个修复程序.遵循以下内容:
Wait! We need another fix before following the instructions further on using VS to build the the library. Following what was said in:
我们必须通过删除以下行来编辑文件 path_to_your_metis_dir\GKlib\gk_arch.h:#define rint(x) ((idx_t)((x)+0.5)).(或者在这个github交换上列出的修复.)
we have to edit the file path_to_your_metis_dir\GKlib\gk_arch.h by removing the line: #define rint(x) ((idx_t)((x)+0.5)). (Or the fix listed on this github exchange.)
然后转到path_to_your_metis_dir\build\windows\.
在 Visual Studios 中打开 METIS.sln，转到顶部到 Build，然后从向下滚动到 Build Solution.之后，.dll 文件将位于 path_to_your_metis_dir\build\windows\libmetis\Release\.
Open METIS.sln in Visual Studios, go to the top to Build and from the scroll-down go to Build Solution. Afterwards, the .dll file will be in path_to_your_metis_dir\build\windows\libmetis\Release\.
最后，我们在命令提示符下运行:set METIS_DLL=path_to_your_metis_dir\build\windows\libmetis\Release\metis.dll
Last, we run in command prompt:set METIS_DLL=path_to_your_metis_dir\build\windows\libmetis\Release\metis.dll
在此之后，python metis 在我的 from metis import * 步骤中不再失败.
After this, python metis no longer failed on the step from metis import * for me.
[1] 如果我们可以使用 .lib，那么 conda install -c conda-forge metis 可以获取这个文件，但是设置 METIS_DLL 到 .lib 文件会导致 Windows 错误.
[1] If we could use .lib, then conda install -c conda-forge metis would work to get this file, but setting METIS_DLL to the .lib file leads to a windows error.
这篇关于如何在 Windows 上的 python 中安装 METIS 包?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！