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Fixed a typo error in pooling.md #1360

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Fixed a typo error in pooling.md #1360

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2 changes: 1 addition & 1 deletion chapter_convolutional-neural-networks/pooling.md
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# 汇聚层
:label:`sec_pooling`

通常当我们处理图像时，我们希望逐渐降低隐藏表示的空间分辨率、聚集信息，这样随着我们在神经网络中层叠的上升，每个神经元对其敏感的感受野（输入）就越大。
通常当我们处理图像时，我们希望逐渐降低隐藏表示的空间分辨率、聚集信息，这样随着我们在神经网络中层叠的上升，每个神经元对其敏感的感受也（输入）就越大。

而我们的机器学习任务通常会跟全局图像的问题有关（例如，“图像是否包含一只猫呢？”），所以我们最后一层的神经元应该对整个输入的全局敏感。通过逐渐聚合信息，生成越来越粗糙的映射，最终实现学习全局表示的目标，同时将卷积图层的所有优势保留在中间层。

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