在Windows中执行scikit-learn程序时出错

Question

当我执行以下代码时：

from nltk.classify.scikitlearn import SklearnClassifier
 sklearn.naive_bayes import MultinomialNB,BernoulliNB

我收到如下错误：

         Traceback (most recent call last):
          File "C:\Python27\uni.py", line 2, in <module>
          from sklearn.naive_bayes import MultinomialNB,BernoulliNB
          File "C:\Python27\lib\site-packages\sklearn\__init__.py", line 56, in       <module>
    from . import __check_build
ImportError: cannot import name __check_build

我是Python的新手，请帮我解决一下如何解决它