设置
如标题中所述,当我尝试加载保存的模型时,我的自定义损失函数出现了问题。我的损失函数如下:
def weighted_cross_entropy(weights):
weights = K.variable(weights)
def loss(y_true, y_pred):
y_pred = K.clip(y_pred, K.epsilon(), 1-K.epsilon())
loss = y_true * K.log(y_pred) * weights
loss = -K.sum(loss, -1)
return loss
return loss
weighted_loss = weighted_cross_entropy([0.1,0.9])
训练时,我使用了weighted_loss
函数作为损失函数,一切顺利。当训练结束后,我使用keras API中的标准model.save
函数将模型保存为.h5
文件。
问题
当我尝试通过以下方式加载模型时:
model = load_model(path,custom_objects={"weighted_loss":weighted_loss})
我收到一个 ValueError
错误,错误信息显示损失函数未知。
错误
错误信息如下所示:
File "...\predict.py", line 29, in my_script
"weighted_loss": weighted_loss})
File "...\Continuum\anaconda3\envs\processing\lib\site-packages\keras\engine\saving.py", line 419, in load_model
model = _deserialize_model(f, custom_objects, compile)
File "...\Continuum\anaconda3\envs\processing\lib\site-packages\keras\engine\saving.py", line 312, in _deserialize_model
sample_weight_mode=sample_weight_mode)
File "...\Continuum\anaconda3\envs\processing\lib\site-packages\keras\engine\training.py", line 139, in compile
loss_function = losses.get(loss)
File "...\Continuum\anaconda3\envs\processing\lib\site-packages\keras\losses.py", line 133, in get
return deserialize(identifier)
File "...\Continuum\anaconda3\envs\processing\lib\site-packages\keras\losses.py", line 114, in deserialize
printable_module_name='loss function')
File "...\Continuum\anaconda3\envs\processing\lib\site-packages\keras\utils\generic_utils.py", line 165, in deserialize_keras_object
':' + function_name)
ValueError: Unknown loss function:loss
问题
我如何解决这个问题?可能是我的包装的损失定义导致了这个问题吗?因此,Keras
不知道如何处理weights
变量?