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I've installed scipy and scikit-learn from Christoph Gohlke Unofficial Windows installers , and the following commands run successfully without error :

>>> import sklearn
>>> import scipy
Then I was going to try sklearn.datasets.load_digits() function as demonstrated in the linked documentation :
from sklearn.datasets import load_digits
but that line triggered an error complaining about, as I understand it, _log_logistic_sigmoid was not found :
Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    from sklearn.datasets import load_digits
  File "C:\Python27\lib\site-packages\sklearn\datasets\__init__.py", line 23, in <module>
    from .twenty_newsgroups import fetch_20newsgroups
  File "C:\Python27\lib\site-packages\sklearn\datasets\twenty_newsgroups.py", line 53, in <module>
    from ..feature_extraction.text import CountVectorizer
  File "C:\Python27\lib\site-packages\sklearn\feature_extraction\__init__.py", line 10, in <module>
    from . import text
  File "C:\Python27\lib\site-packages\sklearn\feature_extraction\text.py", line 29, in <module>
    from ..preprocessing import normalize
  File "C:\Python27\lib\site-packages\sklearn\preprocessing\__init__.py", line 6, in <module>
    from .data import Binarizer
  File "C:\Python27\lib\site-packages\sklearn\preprocessing\data.py", line 19, in <module>
    from ..utils.extmath import row_norms
  File "C:\Python27\lib\site-packages\sklearn\utils\extmath.py", line 23, in <module>
    from ._logistic_sigmoid import _log_logistic_sigmoid
ImportError: DLL load failed: The specified module could not be found.
Anybody ever experienced this error? How to fix that?
I'm using python 2.7 on windows 8 machine if that help.
Solved by uninstalling the unofficial package, then reinstall from the official package using the following command :
pip install -U numpy scipy scikit-learn
        
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