关于module ‘keras.applications’ has no attribute ‘nasnet’/ ‘keras’ has no attribute ‘application’的解决方案

nas = keras.applications.nasnet.NASNetLarge(input_shape=(331,331,3), include_top=False, weights='imagenet',pooling="avg")

module 'keras.applications' has no attribute 'nasnet'

module 'keras' has no attribute 'applications'

cannot import name 'binary_focal_crossentropy' from 'keras.backend' 

Another metric with the same name already exists.

keras被tensorflow收购后一些旧版本的包嵌套关系不适用，因此最终解决步骤为：

1 首先卸载现有的tensorflow和keras

2 重新安装最新版的tensorflow，我安装的2.8.0版本

pip install -i https://pypi.tuna.tsinghua.edu.cn/simple tensorflow-cpu==2.8.0

3 代码修改为

import tensorflow as tf

tf.keras.applications.nasnet.NASNetLarge()

import tensorflow as tf

nas = tf.keras.applications.nasnet.NASNetLarge(input_shape=(331,331,3), include_top=False, weights='imagenet',pooling="avg")