name 'backend' is not defined

backend' is not defined"/>

name 'backend' is not defined

在kears模型中有用到backend，在训练时没有异常，在load model进行predict时，居然报错：name ‘backend’ is not defined。

import keras.backend as backendy = Lambda(lambda z: z[:, :, :, j * c:(j + 1) * c]if backend.image_data_format() == 'channels_last' elselambda z: z[:, j * c:(j + 1) * c, :, :])(x)

解决方式如下：
在loadmodel时，自定义字典custom_objects里面加入‘backend’:backend

import keras.backend as backendmodel = load_model('./unet_' + label + '_20.h5',custom_objects={'focal_loss_fixed': focal_loss(),
‘backend':backend},compile=False)