2023-05-27 23:02:51 +01:00
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- Fractionally strided convolution
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- Transposed [[convolution]]
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- Like a deep interpolation
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- Convolution with a fractional input stride
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- Up-sampling is convolution 'in reverse'
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- Not an actual inverse convolution
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- For scaling up by a factor of $f$
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- Consider as a [[convolution]] of stride $1/f$
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- Could specify kernel
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- Or learn
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- Can have multiple upconv layers
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- Separated by [[Activation Functions#ReLu|ReLu]]
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- For non-linear up-sampling conv
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- Interpolation is linear
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![[upconv.png]]
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# Convolution Matrix
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Normal
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![[upconv-matrix.png]]
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- Equivalent operation with a flattened input
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- Row per kernel location
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- Many-to-one operation
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![[upconv-matrix-result.png]]
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[Understanding transposed convolutions](https://www.machinecurve.com/index.php/2019/09/29/understanding-transposed-convolutions/)
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## Transposed
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![[upconv-transposed-matrix.png]]
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- One-to-many
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![[upconv-matrix-transposed-result.png]]
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