在深度学习中，有几类经典激活函数，每种都有自己的优缺点：
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You look at a region of the image. If all the pixels are roughly the same color (below some threshold), you store the average color for the whole region as a single value. If the pixels vary too much, you split the region into four quadrants and try again.
选择激活函数时，可以根据以下几个原则：