Siren
Sinusoidal Representation Network
**Siren**, or **Sinusoidal Representation Network**, is a periodic activation function for implicit neural representations. Specifically it uses the sine as a periodic activation function:

$$ \Phi\left(x\right) = \textbf{W}\_{n}\left(\phi\_{n-1} \circ \phi\_{n-2} \circ \dots \circ \phi\_{0} \right) $$
Implicit Neural Representations with Periodic Activation Functions
https://paperswithcode.com/paper/implicit-neural-representations-with-periodic
Implicit Neural Representations with Periodic Activation Functions