Created by: yeyupiaoling

比如下面这几行代码，有什么用，在非Fluid版本中，没有见过类似的 https://github.com/PaddlePaddle/models/blob/df8060e7022fcac12fd33a8adf098c0663d8152d/fluid/image_classification/mobilenet.py#L175-L185

https://github.com/PaddlePaddle/models/blob/df8060e7022fcac12fd33a8adf098c0663d8152d/fluid/image_classification/mobilenet.py#L168

https://github.com/PaddlePaddle/models/blob/df8060e7022fcac12fd33a8adf098c0663d8152d/fluid/image_classification/mobilenet.py#L194

https://github.com/PaddlePaddle/models/blob/df8060e7022fcac12fd33a8adf098c0663d8152d/fluid/image_classification/mobilenet.py#L201

是否能解答以上几行代码的作用