'NoneType' object has no attribute 'summary'

1. 什么是NoneType

来自stackoverflow上的回答：NoneType is the type for the None object, which is an object that indicates no value. None is the return value of functions that "don‘t return anything". It is also a common default return value for functions that search for something and may or may not find it;

2 . 出现的问题

问题代码如下

1 model = AE()
2 model = model.build(input_shape=(None, 784))
3 model.summary()

第2行代码出错了，model.build()是不返回什么的。所以此时model变成了NoneType object，而NoneType object并没有summary属性，所以直接报错‘NoneType‘ object has no attribute ‘summary‘

原文：https://www.cnblogs.com/zhenlingmo/p/12634362.html