I am confused with these two structures. In theory, the output of them are all connected to their input. what magic make 'self-attention mechanism' is more powerful than the full-connection layer?
what's the difference between "self-attention mechanism" and "full-connection" layer?
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Ignoring details like normalization, biases, and such, fully connected networks are fixed-weights:
where
Wis learned in training, and fixed in inference.Self-attention layers are dynamic, changing the weight as it goes:
Again this is ignoring a lot of details but there are many different implementations for different applications and you should really check a paper for that.