CODEWITHSUNDEEP
machine-learningneural-networkdeep-learningartificial-intelligenceconv-neural-network
bestie
bestie

Reputation: 41

What exactly is a Unet?

Is every symmetrical fully convolutional network a Unet?

Does the skip connections between the downsampling path and the upsampling path always need to apply a concatenation operator instead of a sum? What difference does it make if we use sum?

Can I assume that if a network has unequal no. of upsampling and downsampling layers, it is an FCN and not a Unet?

Upvotes: 0

Views: 1136

Answers (1)

Daniel Möller
Daniel Möller

Reputation: 86600

Every UNet is a FCN, but they can have extra techniques appended.

There isn't an "exact UNet", you can make lots of changes. In the last image segmentation competition I participated, everyone talked about modified UNets with customized decoder sides.

They can concatenate the connections, sum, multiply. There are even attention mechanisms to be used. A lot of people created UNets from ResNets, for instance.

The UNets are just nets that have two sides, down and upsampling, with connections between.

Upvotes: 1

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