Python ValueError: Invalid backend. Missing required entry : placeholder； from keras.callbacks import Callback

 

Traceback (most recent call last):
  File "E:/tion-AiLi-v2.py", line 37, in <module>
    from keras.callbacks import Callback
  File "E:\Eprogramfiles\Anaconda3\envs\\lib\site-packages\keras\__init__.py", line 4, in <module>
    from . import backend
  File "E:\Eprogramfiles\Anaconda3\envs\\lib\site-packages\keras\backend\__init__.py", line 1, in <module>
    from .load_backend import epsilon
  File "E:\Eprogramfiles\Anaconda3\envs\\lib\site-packages\keras\backend\load_backend.py", line 101, in <module>
    raise ValueError('Invalid backend. Missing required entry : ' + e)
ValueError: Invalid backend. Missing required entry : placeholder

 

 

 

修改 keras.json

如下：

{"floatx":"float32","epsilon":1e-7,"backend":"tensorflow","image_data_format":"channels_last"}

将 “backend” 改为 tensorflow  。