AssertionError是怎么回事呢？
Traceback (most recent call last):
? File "D:/untitled/python/7_keras.py", line 2, in <module>
? ? from keras.models import Sequential
? File "C:\Users\Administrator\AppData\Roaming\Python\Python27\site-packages\keras\__init__.py", line 3, in <module>
? ? from . import utils
? File "C:\Users\Administrator\AppData\Roaming\Python\Python27\site-packages\keras\utils\__init__.py", line 6, in <module>
? ? from . import conv_utils
? File "C:\Users\Administrator\AppData\Roaming\Python\Python27\site-packages\keras\utils\conv_utils.py", line 9, in <module>
? ? from .. import backend as K
? File "C:\Users\Administrator\AppData\Roaming\Python\Python27\site-packages\keras\backend\__init__.py", line 44, in <module>
? ? assert _image_data_format in {'channels_last', 'channels_first'}
AssertionError
