group norm 这个模块是在normalization.py文件里面定义的（https://github.com/tensorflow/tensorflow/blob/r1.8/tensorflow/contrib/layers/python/layers/normalization.py)
我的tensorflow版本是1.3.0，没有这个文件，所以报了这个错误。解决方法：pip install tensorflow==1.8.0
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- AttributeError: module ‘tensorflow.contrib.layers’ has no attribute ‘group_norm’