[python] ImportError in importing from sklearn: cannot import name check_build

I am getting the following error while trying to import from sklearn:

>>> from sklearn import svm

Traceback (most recent call last):
  File "<pyshell#17>", line 1, in <module>
   from sklearn import svm
  File "C:\Python27\lib\site-packages\sklearn\__init__.py", line 16, in <module>
   from . import check_build
ImportError: cannot import name check_build

I am using python 2.7, scipy-0.12.0b1 superpack, numpy-1.6.0 superpack, scikit-learn-0.11 I have a windows 7 machine

I have checked several answers for this issue but none of them gives a way out of this error.

i had the same problem reinstalling anaconda solved the issue for me

no need to uninstall & then re-install sklearn

try this:

from sklearn.model_selection import train_test_split

In windows:

I tried to delete sklearn from the shell: pip uninstall sklearn, and re install it but doesn't work ..

the solution:

1- open the cmd shell.
2- cd c:\pythonVERSION\scripts
3- pip uninstall sklearn
4- open in the explorer: C:\pythonVERSION\Lib\site-packages
5- look for the folders that contains sklearn and delete them ..
6- back to cmd: pip install sklearn

None of the other answers worked for me. After some tinkering I unsinstalled sklearn:

pip uninstall sklearn

Then I removed sklearn folder from here: (adjust the path to your system and python version)

C:\Users\%USERNAME%\AppData\Roaming\Python\Python36\site-packages

And the installed it from wheel from this site: link

The error was there probably because of a version conflict with sklearn installed somewhere else.

I had the same issue on Windows. Solved it by installing Numpy+MKL from http://www.lfd.uci.edu/~gohlke/pythonlibs/#numpy (there it's recommended to install numpy+mkl before other packages that depend on it) as suggested by this answer.

>>> from sklearn import preprocessing, metrics, cross_validation

Traceback (most recent call last):
  File "<pyshell#6>", line 1, in <module>
    from sklearn import preprocessing, metrics, cross_validation
  File "D:\Python27\lib\site-packages\sklearn\__init__.py", line 31, in <module>
    from . import __check_build
ImportError: cannot import name __check_build
>>> ================================ RESTART ================================
>>> from sklearn import preprocessing, metrics, cross_validation
>>> 

So, simply try to restart the shell!

For me, I was upgrading the existing code into new setup by installing Anaconda from fresh with latest python version(3.7) For this,

from sklearn import cross_validation, 
from sklearn.grid_search import GridSearchCV

to

from sklearn.model_selection import GridSearchCV,cross_validate

After installing numpy , scipy ,sklearn still has error

Solution:

Setting Up System Path Variable for Python & the PYTHONPATH Environment Variable

System Variables: add C:\Python34 into path User Variables: add new: (name)PYTHONPATH (value)C:\Python34\Lib\site-packages;

Usually when I get these kinds of errors, opening the __init__.py file and poking around helps. Go to the directory C:\Python27\lib\site-packages\sklearn and ensure that there's a sub-directory called __check_build as a first step. On my machine (with a working sklearn installation, Mac OSX, Python 2.7.3) I have __init__.py, setup.py, their associated .pyc files, and a binary _check_build.so.

Poking around the __init__.py in that directory, the next step I'd take is to go to sklearn/__init__.py and comment out the import statement---the check_build stuff just checks that things were compiled correctly, it doesn't appear to do anything but call a precompiled binary. This is, of course, at your own risk, and (to be sure) a work around. If your build failed you'll likely soon run into other, bigger problems.

I had problems importing SKLEARN after installing a new 64bit version of Python 3.4 from python.org.

Turns out that it was the SCIPY module that was broken, and alos failed when I tried to "import scipy".

Solution was to uninstall scipy and reinstall it with pip3:

C:\> pip uninstall scipy

[lots of reporting messages deleted]

Proceed (y/n)? y
  Successfully uninstalled scipy-1.0.0

C:\Users\>pip3 install scipy

Collecting scipy
  Downloading scipy-1.0.0-cp36-none-win_amd64.whl (30.8MB)
    100% |¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦¦| 30.8MB 33kB/s
Requirement already satisfied: numpy>=1.8.2 in c:\users\johnmccurdy\appdata\loca
l\programs\python\python36\lib\site-packages (from scipy)
Installing collected packages: scipy
Successfully installed scipy-1.0.0

C:\Users>python
Python 3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:54:40) [MSC v.1900 64 bit (AMD64)]
 on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import scipy
>>>
>>> import sklearn
>>>

My solution for Python 3.6.5 64-bit Windows 10:

1. pip uninstall sklearn
2. pip uninstall scikit-learn
3. pip install sklearn

No need to restart command-line but you can do this if you want. It took me one day to fix this bug. Hope this help.

If you use Anaconda 2.7 64 bit, try

conda upgrade scikit-learn

and restart the python shell, that works for me.

Second edit when I faced the same problem and solved it:

conda upgrade scikit-learn

also works for me