ValueError: 'The specified size contains a dimension with value

ValueError: ‘The specified size contains a dimension with value <= 0’的解决方法

在keras下搭建神经网络，运行demo报错。

错误文本：
C:\ProgramData\Anaconda2\python.exe "F:/Program Files (x86)/JetBrains/PycharmProjects/untitled1/CNN3.py"
Using Theano backend.
Traceback (most recent call last):
  File "F:/Program Files (x86)/JetBrains/PycharmProjects/untitled1/CNN3.py", line 43, in 
    model = baseline_model()
  File "F:/Program Files (x86)/JetBrains/PycharmProjects/untitled1/CNN3.py", line 37, in baseline_model
    model.add(Dense(128, activation='relu'))
  File "C:\ProgramData\Anaconda2\lib\site-packages\keras\models.py", line 455, in add
    output_tensor = layer(self.outputs[0])
  File "C:\ProgramData\Anaconda2\lib\site-packages\keras\engine\topology.py", line 528, in __call__
    self.build(input_shapes[0])
  File "C:\ProgramData\Anaconda2\lib\site-packages\keras\layers\core.py", line 827, in build
    constraint=self.kernel_constraint)
  File "C:\ProgramData\Anaconda2\lib\site-packages\keras\engine\topology.py", line 364, in add_weight
    weight = K.variable(initializer(shape), dtype=K.floatx(), name=name)
  File "C:\ProgramData\Anaconda2\lib\site-packages\keras\initializers.py", line 205, in __call__
    dtype=dtype, seed=self.seed)
  File "C:\ProgramData\Anaconda2\lib\site-packages\keras\backend\theano_backend.py", line 1969, in random_uniform
    return rng.uniform(shape, low=minval, high=maxval, dtype=dtype)
  File "C:\ProgramData\Anaconda2\lib\site-packages\theano\sandbox\rng_mrg.py", line 1344, in uniform
    size)
ValueError: ('The specified size contains a dimension with value <= 0', (-768, 128))

运行截图如下：

解决方式：
修改keras.json文件

修改后：

这是因为后台不同，我选择的是Theano后台：
Tensorflow ordering (tf):
Shapes are expected to be (size_lines,size_columns,channel)
Theano ordering (th):
Shapes are expected to be (channel,size_lines,size_columns)
If you change the ordering line in the keras.json file to “image_dim_ordering”: “th” it should work. (i’d bet that’s what’s in your Elementary OS keras.json).