我正在尝试创建一个合并两个源的自定义层。我收到错误“InvalidArgumentError:In[0].dim(0)和In[1].dim(0)必须相同:[1125150]vs[32150125]”。如果我将batch_size设置为1,那么[1125150]vs[1150125]将运行该代码;但是,丢失不会改变,因此仍然不是根本原因。我想我需要使用批量大小,而不是仅仅扩大尺寸
class mergeLayer(L.Layer):
def __init__(self, output_dim, **kwargs):
self.output_dim = output_dim
super(mergeLayer,self).__init__()
self.kernel_initializer = INIT.get('uniform')
def build(self, input_shape):
# Create a trainable weight variable for this layer.
self.kernel = self.add_weight(name='kernel',shape=input_shape[1:],initializer=self.kernel_initializer,trainable=True)
super(mergeLayer,self).build(input_shape) # Be sure to call this somewhere!
def call(self, x):
temp = K.batch_dot(tf.expand_dims(self.kernel,0),tf.transpose(x,perm=[0,2,1]))+1
return temp
def compute_output_shape(self, input_shape):
return input_shape
下面是适合模型的代码。同样,如果我在这里将batch_size更改为1,我可以运行代码,但损失保持不变。在
^{pr2}$批处理大小为1时输出
Epoch 1/100
3903/3903 [=========================] - 45s - loss: 15.7062 - acc: 0.0254
Epoch 2/100
3903/3903 [=========================] - 43s - loss: 15.7050 - acc: 0.0254
Epoch 3/100
277/3903 [=>.......................] - ETA: 42s - loss: 15.8272 - acc: 0.0181
非常感谢您的时间和帮助。在
更新:下面是调用mergeLayer的Keras模型结构
def buildModel_merge(numClasses):
source = L.Input(shape=(64,25,1))
x = L.Conv2D(150, (3,3), activation='relu', name='conv1a')(source)
x = L.MaxPooling2D((2,2))(x)
x = L.BatchNormalization()(x)
x = L.Conv2D(150, (3,3), activation='relu', name='conv2a')(x)
x = L.Conv2D(150, (5,5), activation='relu', name='conv3a')(x)
x = L.Dropout(0.5)(x)
#reshape into a dxN matrix
x = L.Reshape((125,150))(x)
x = mergeLayer(100)(x)
source2 = L.Input(shape=(30,30,30,1))
x2 = L.Conv3D(32,(5,5,5),strides=(2,2,2),activation='relu',name='conv1b')(source2)
x2 = L.Dropout(0.2)(x2)
x2 = L.Conv3D(32,(3,3,3),activation='relu',name='conv2b')(x2)
x2 = L.MaxPooling3D(pool_size=(2,2,2),name='pool2b')(x2)
x2 = L.Dropout(0.3)(x2)
#reshape into a dxM matrix
x2 = L.Reshape((125,32))(x2)
x2 = mergeLayer(100)(x2)
#x = L.Multiply(x, x2)(x)
x = L.Multiply()([x,x2])
x = L.Flatten()(x)
x = L.Dense(400, activation='relu', name='dense1')(x) # Is relu used here?
x = L.Dropout(0.5)(x)
classify = L.Dense(numClasses, activation='softmax', name='dense2')(x)
model = M.Model(inputs=[source,source2],outputs=classify)
optimizer= O.SGD(momentum=0.02)
model.compile(optimizer=optimizer, loss='categorical_crossentropy', metrics=['acc'])
return model
以下是代码中的一些更正:
output_dim
和**kwargs
参数expand_dims
(但是您的keras版本的行为似乎与我的不同,所以使用#alternative
行代码)。在batch_dot
需要两个具有相同批量大小的张量(这意味着:第一个维度必须相同)x
的批大小来解决这个问题tf
函数与keras后端函数(import keras.backend as K
)交换-这不是问题,但是您可以使用此方法将此解决方案移植到其他受支持的后端。在一。在
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