如何为 Python 设置 LIBSVM
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How to Setup LIBSVM for Python
提问by David Williams
I built libsvmon Mac OS X with Make.
我使用 Make 在 Mac OS X 上构建了libsvm。
$ tar xzfv libsvm-3.17.tar.gz
$ cd libsvm-3.17
$ make
This built the various libsvm binaries:
这构建了各种 libsvm 二进制文件：
$ ls
COPYRIGHT heart_scale svm-predict.c svm-train.c tools
FAQ.html java svm-scale svm.cpp windows
Makefile matlab svm-scale.c svm.def
Makefile.win python svm-toy svm.h
README svm-predict svm-train svm.o
I also linked to this in /usr/local:
我也在/usr/local：
$ ls -la /usr/local/
...
svm -> /usr/local/libsvm-3.17/
And appended the Python bindings to my path:
并将 Python 绑定附加到我的路径中：
import sys
sys.path.append('/usr/local/svm/python')
But the Python bindings cannot find the "LIBSVM" library:
但是 Python 绑定找不到“LIBSVM”库：
$ python test.py
Traceback (most recent call last):
File "test.py", line 8, in <module>
import svmutil
File "/usr/local/svm/python/svmutil.py", line 5, in <module>
from svm import *
File "/usr/local/svm/python/svm.py", line 22, in <module>
raise Exception('LIBSVM library not found.')
Exception: LIBSVM library not found.
Can anyone tell me how to set this up? In the python readme for libsvm the only description is
谁能告诉我如何设置？在 libsvm 的 python 自述文件中，唯一的描述是
Installation
============
On Unix systems, type
> make
The interface needs only LIBSVM shared library, which is generated by
the above command. We assume that the shared library is on the LIBSVM
main directory or in the system path.
What am I missing?
我错过了什么？
采纳答案by Eric O Lebigot
Instead of going through libsvm in order to access it with Python (I installed libsvm through MacPorts, and import svmutilfails), you might want to install the popular scikit-learnpackage, which contains an optimized version of libsvm with Python bindings.
与其通过 libsvm 以使用 Python 访问它（我通过 MacPorts 安装了 libsvm，但import svmutil失败了），您可能想要安装流行的scikit-learn包，其中包含带有 Python 绑定的libsvm的优化版本。
The install is very simple with MacPorts: sudo port install py27-scikit-learn(adapt py27to whatever version of Python you use).
MacPorts的安装非常简单：（sudo port install py27-scikit-learn适应py27您使用的任何版本的 Python）。
回答by Owen
In case you need a non-MacPorts solution, see this page (especially the comment from Thanassis):
如果您需要非 MacPorts 解决方案，请参阅此页面（尤其是来自 Thanassis 的评论）：
Installing libsvm-3.0 for Python on OSX 10.6
在 OSX 10.6 上为 Python 安装 libsvm-3.0
Despite the title of the post, the solution worked for me on a CentOS machine with python 2.7.
尽管帖子标题如此，但该解决方案在装有 python 2.7 的 CentOS 机器上对我有用。
回答by Coderzelf
You should go into /python and make to generate .so.1 file
你应该进入 /python 并生成 .so.1 文件
回答by MagicalMachines
find_library in python is only looking at files with an extension of .so. In order for this to work correctly you need to create a libsvm.so:
python 中的 find_library 只查看扩展名为 .so 的文件。为了使其正常工作，您需要创建一个 libsvm.so：
% ln -s libsvm.so.2 libsvm.so
% ln -s libsvm.so.2 libsvm.so
Then try this again, it will work correctly.
然后再试一次，它会正常工作。
回答by Raja
Seems like a old thread. Hope it helps someone else in the future.
看起来像一个旧线程。希望它可以帮助其他人在未来。
I had the same problem. The solution is
我有同样的问题。解决办法是
- Run
makein libsvm-3.0 directory - Run
makein libsvm-3.0/python directory
make在 libsvm-3.0 目录下运行- 运行
make在LIBSVM-3.0 /蟒蛇目录
If you did only at libsvm-3.0 folder you will face this issue. Do it at both the folders. Then it will work fine.
如果您仅在 libsvm-3.0 文件夹中执行此操作，您将面临此问题。在两个文件夹中执行此操作。然后它会正常工作。
回答by zhen wang
you can also try to use homebrew to install the libsvm like 'brew install libsvm',then you can open your project file and copy the 'svmutil.py' and 'svm.py' files to the project floder,then you can use the command 'from svmutil import *',and maybe it will be ok.
您也可以尝试使用 homebrew 安装 libsvm，例如 'brew install libsvm'，然后您可以打开您的项目文件并将 'svmutil.py' 和 'svm.py' 文件复制到项目 floder，然后您可以使用命令'from svmutil import *'，也许就可以了。
回答by syssel
You do not need to use scikit learn in order to use libSVM. I had the same issue when loading the libsvmmodules through python. I cloned the project from github and run build it from the command-line with make, and after setting the enviroment, I got the same error.
您无需使用 scikit learn 即可使用 libSVM。libsvm通过python加载模块时我遇到了同样的问题。我从 github 克隆了该项目并使用 运行从命令行构建它make，在设置环境后，我得到了同样的错误。
I fixed the issue by installing libSVM through homebrew:
我通过以下方式安装 libSVM 解决了这个问题homebrew：
brew install libsvm
brew install libsvm
This do not include the python specific binaries, so you would still have to clone and make from github and set up the environment.
这不包括特定于 python 的二进制文件，因此您仍然需要从 github 克隆和制作并设置环境。
