keras使用load

• 在自定义继承自keras.Model的模型时，使用model.save("mode.h5")会报错，于是，可行的方法是，使用model.save_weights("seg_model_weights.h5")时正确保存。但是在加载模型时报错：

'Unable to load weights saved in HDF5 format into a subclassed ’ ValueError: Unable to load weights saved in HDF5 format into a
subclassed Model which has not created its variables yet. Call the
Model first, then load the weights.

• 在加载之前先build，model.build(input_shape =)。下面是样例

model.build(input_shape =(None,256,256,3))
model.load_weights(path)