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**问题**

讲一下 pooling 的作用, 为什么 max pooling 要更常用?哪些情况下,average pooling 比 max pooling 更合适?

**作用:**

对输入的特征图进行压缩,一方面使特征图变小,简化网络计算复杂度;一方面进行特征压缩,提取主要特征。

通常来讲,max-pooling 的效果更好,虽然 max-pooling 和 average-pooling 都对数据做了下采样,但是 max-pooling 感觉更像是做了特征选择,选出了分类辨识度更好的特征,提供了非线性。 pooling 的主要作用一方面是去掉冗余信息,一方面要保留 feature map 的特征信息,在分类问题中,我们需要知道的是这张图像有什么 object,而不大关心这个 object 位置在哪,在这种情况下显然 max pooling 比 average pooling 更合适。在网络比较深的地方,特征已经稀疏了,从一块区域里选出最大的,比起这片区域的平均值来,更能把稀疏的特征传递下去。


average-pooling 更强调对整体特征信息进行一层下采样,在减少参数维度的贡献上更大一点,更多的体现在信息的完整传递这个维度上,在一个很大很有代表性的模型中,比如说 DenseNet 中的模块之间的连接大多采用 average-pooling,在减少维度的同时,更有利信息传递到下一个模块进行特征提取。


average-pooling 在全局平均池化 GAP 操作中应用也比较广,在 ResNet 和 Inception 结构中最后一层都使用了平均池化。有的时候在模型接近分类器的末端使用全局平均池化 GAP 还可以代替 Flatten 操作,使输入数据变成一位向量。
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https://blog.csdn.net/vivian_ll/article/details/105201120

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