正确的思考方向是，理解人工智能是应用数学，是实验科学，允许各种人为简化，只要这些人为简化在实验中表现出有效性和高效性即可。本文所描述的卷积神经网络中，反向传播算法穿过无梯度的池化层，就是诸多人为简化的例子之一。

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