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当我运行下面的代码时，我遇到了以下问题。（仅供参考。我已经使用 GIT Shell 使用以下命令 pip install -U scikit-learn 安装了 scikit-learn）

import pandas as pd
import pandas.io.data as web
from sklearn.decomposition import KernelPCA

我收到以下错误

ImportError                               Traceback (most recent call last)
<ipython-input-1-8cac97052fa7> in <module>()
  2 import pandas as pd
  3 import pandas.io.data as web
----> 4 from sklearn.decomposition import KernelPCA

C:\Users\Alpha\Anaconda2\lib\site-packages\sklearn\__init__.py in <module>()
 55 else:
 56     from . import __check_build
---> 57     from .base import clone
 58     __check_build  # avoid flakes unused variable error
 59 
11 from .externals import six
12 from .utils.fixes import signature
---> 13 from .utils.deprecation import deprecated
14 from .exceptions import ChangedBehaviorWarning as         _ChangedBehaviorWarning
15 from . import __version__
ImportError: No module named deprecation
4

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