And the role of the type of cell layer

Original connection: https: //blog.csdn.net/XX_123_1_RJ/article/details/86677482

 

The principle of the pool or process : pooling is performed separately on the different channels (that is, the pool does not change the number of operation channels), and does not require the control parameters. And then perform a corresponding operation according to the window size. Generally max pooling, average pooling the like.

A. Pooled layer major role

1. The primary role of downsampling (downsamping)
2. Dimension reduction, removing redundant information, compression feature, simplifying network complexity, reduce the amount of calculation, and so reduce memory consumption. All kinds of rhetoric it, is to reduce the number of total understanding.
3. To achieve non-linear (this can think about, relu function, is not it a bit like the feeling?).
4. Perception can expand wild
5. Invariance can be achieved, which comprises invariance, translation invariance, rotation invariance and scale invariance.

Reference connection:

• https://zhuanlan.zhihu.com/p/27642620
• https://www.zhihu.com/question/36686900
• https://blog.csdn.net/LIYUAN123ZHOUHUI/article/details/61920796

Second Pooling What are the main categories:

1. General pooled (General Pooling): One of the most common pooling operations had an average pool and the largest pool of:

　　　　Pooled mean (average pooling): calculating an average value of image area as the value of the pool area.

　　　　Pooling maximum (max pooling): maximum image area is selected as the value of the pool area.