from tensorflow.keras import layers
关于Keras的“层”（Layer）——常用层_人工智能_李鑫玉的博客-CSDN博客
https://blog.csdn.net/qq_41007606/article/details/83822053?depth_1-utm_source=distribute.pc_relevant.none-task&utm_source=distribute.pc_relevant.none-task
from tensorflow.keras import optimizers
keras 整理之 Layers_人工智能_IT届的小学生-CSDN博客
https://blog.csdn.net/HHTNAN/article/details/82493952?depth_1-utm_source=distribute.pc_relevant.none-task&utm_source=distribute.pc_relevant.none-task
from tensorflow.keras.models import Model, load_model
调用Kears中kears.model.load_model方法遇到的问题和解决方法_人工智能_qian1122221的博客-CSDN博客
https://blog.csdn.net/qian1122221/article/details/88746047
from tensorflow.keras import callbacks
回调函数 Callbacks - Keras 中文文档
https://keras.io/zh/callbacks/
五、keras callbacks使用攻略 - 简书
https://www.jianshu.com/p/b05fb25de85c
from tensorflow.keras import backend as K
后端 Backend - Keras 中文文档
https://keras.io/zh/backend/
from tensorflow.keras import utils
utils 工具 - Keras中文文档
https://keras-cn.readthedocs.io/en/latest/utils/