python2.7安装keras时报错，什么原因呢？

安装Keras时出错，np__utils是什么模块？

 Traceback (most recent call last):
  File "<pyshell#28>", line 1, in <module>
    import keras
  File "C:\Python27\lib\site-packages\keras\__init__.py", line 3, in <module>
    from . import utils
  File "C:\Python27\lib\site-packages\keras\utils\__init__.py", line 2, in <module>
    from . import np_utils
ImportError: cannot import name np_utils