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Can a fully convolutional network handle smaller images at test time?

AI Stack ExchangeAnalysis or commentary·
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A question on AI Stack Exchange asks whether a fully convolutional network can process smaller images at test time, noting that such networks reinterpret dense layers as convolutional operations.

Written by AI from AI Stack Exchange's published text.

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“It is said that a fully convolutional network can handle any image size. I don't understand. Unlike regular CNN, a fully convolutional network reinterprets the dense layer as a convolutional operation.”
AI Stack Exchange, 12 Sept 2026, 22:10.

Interpretation or community commentary rather than straight reporting.

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