python sklearn机器学习库 安装

1、准备工作

安装sklearn之前，我们需要先安装numpy，scipy函数库。

Numpy下载地址：http://sourceforge.net/projects/numpy/files/NumPy

Scipy下载地址：http://sourceforge.net/projects/scipy/files/Scipy

下载对应本机的python版本。

2、安装sklearn机器学习库

下载地址：https://github.com/scikit-learn/scikit-learn

下载压缩包之后，解该压缩包压缩。使用CMD进入sklearn文件夹，执行

python setup.py install

即安装完成。

3、报错解决

我们在导入sklearn时往往会报错。

>>> import sklearn

Traceback (most recent call last):

File "<stdin>", line 1, in <module>

File "sklearn/__init__.py", line 37, in <module>

from . import __check_build

File "sklearn/__check_build/__init__.py", line 46, in <module>

raise_build_error(e)

File "sklearn/__check_build/__init__.py", line 41, in raise_build_error

%s""" % (e, local_dir, ''.join(dir_content).strip(), msg))

ImportError: No module named _check_build

___________________________________________________________________________

Contents of sklearn/__check_build:

__init__.py __init__.pyc _check_build.c

_check_build.pyx setup.py setup.pyc

___________________________________________________________________________

It seems that scikit-learn has not been built correctly.

If you have installed scikit-learn from source, please do not forget

to build the package before using it: run `python setup.py install` or

`make` in the source directory.

If you have used an installer, please check that it is suited for your

Python version, your operating system and your platform.

当我们遇到这种错误时，我建议把Numpy和Scipy两个库重安下，可能之前安装的时间过长导致的。

>>from sklearn import datasets

Traceback (most recent call last):
File "E:\P\plot_ols.py", line 28, in
from sklearn import datasets, linear_model
File "C:\Python27\lib\site-packages\sklearn\linear_model\__init__.py", line 12, in
from .base import LinearRegression
File "C:\Python27\lib\site-packages\sklearn\linear_model\base.py", line 29, in
from ..utils.sparsefuncs import mean_variance_axis0, inplace_column_scale
ImportError: cannot import name inplace_column_scale

当遇到这个错误时，我们应该把以下文件删掉。

python27\Lib\site-packages\sklearn\utils\sparsefuncs.pyd

当我们遇到类似 “ImportError：cannot import name **”这样的问题时，我们运行

pip install -U scikit-learn

这样问题就解决了。。